Four New Species of the Genus Miridiba Reitter (Coleoptera: Scarabaeidae: Melolonthinae) from China

Zootaxa 4527 (1): 001–020 ISSN 1175-5326 (print edition) http://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2018 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.4527.1.1 http://zoobank.org/urn:lsid:zoobank.org:pub:71CB1CF8-CC28-4D9B-BF30-7FE197E432A1

Four new species of the genus Miridiba Reitter (Coleoptera: Scarabaeidae: Melolonthinae) from China

CHUAN-BU GAO1, MING BAI2, HONG FANG1 & ZHI-GUO YU1,3 1College of Plant Protection, Shenyang Agriculture University, Shenyang, 110866 China. E-mail: [email protected], [email protected], [email protected] 2Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101 China. E-mail: [email protected] 3Corresponding author

Abstract

Four new species of the genus Miridiba Reitter, 1902 from South China are described and illustrated: Miridiba (Miridiba) bannaensis Gao & Fang, new species, M. (M.) kuatunensis Gao & Fang, new species, M. (M.) xingkei Gao & Fang new species and M. (M.) youweii Gao & Fang, new species. Miridiba (M.) tuberculipennis obscura Itoh, 1995 is raised to species level. Miridiba (M.) obscura Itoh, 1995 and M. (M.) tuberculipennis (Moser, 1913) are newly recorded for China. A catalogue of Miridiba species from China is provided. [Zoobank registrations: Miridiba bannaensis Gao & Fang, new species: LSID: urn:lsid:zoobank.org:act:0AEA5EFC-0914-437A-AEF6-C2685247E427 Miridiba kuatunensis Gao & Fang, new species: LSID: urn:lsid:zoobank.org:act:148F9BA8-5666-40DC-A209-25C4B68D5CD5 Miridiba xingkei Gao & Fang, new species: LSID: urn:lsid:zoobank.org:act:65A3141D-C7AC-4E89-BB20-5F5CFFA4D58E Miridiba youweii Gao & Fang, new species: LSID: urn:lsid:zoobank.org:act:DDA98D6C-5753-4F82-A49A-D9C7913DCFC2]

Key words: morphology, catalogue, Miridiba, new species, new records, China

Introduction

The chafer genus Miridiba Reitter, 1902 (Scarabaeidae: Melolonthinae: Rhizotrogini) encompasses 44 species widely distributed in the Oriental and Palaearctic regions (Schoolmeesters 2018). With more than four species Miridiba forms a group of chafers frequently cited as pests damaging wheat, millet, corn, groundnut, potato, crops (Wei 1989). The genus was described as monotypic to accommodate a single species Rhizotrogus trichophorus Fairmaire, 1891. Altogether 27 species were listed in a revision of Miridiba (Coca-Abia 2008), characterized by the branches of paramere, the transversal carina at basal frons, the tiny setae on the ventral apex of pro- and mesotarsomeres 1–4 and the dense setae on ventral side of mentum. Later on, nine additional species were described (Keith 2010; Keith & Sabatinelli 2010; Li et al. 2015) and eight species were transferred from Holotrichia Hope, 1837 to Miridiba (Keith & Sabatinelli 2010; Matsumoto 2011, 2016; Bezděk 2016). The main goal of this research is to describe four new species of the genus Miridiba from South China and to provide a catalogue of the 18 species of the genus Miridiba known from China. Moreover, Miridiba (M.) tuberculipennis obscura Itoh, 1995 is elevated to species status. Both M. (M.) obscura Itoh, 1995 and M. (M.) tuberculipennis (Moser, 1913) are newly recorded from China.

Material and methods

This research is based on examination of 194 specimens deposited in the Natural History Museum, London (BMNH), the Institute of Zoology, Chinese Academy of Sciences, Beijing (IZCAS), Museum für Naturkunde, Leibniz Gemeinschaft, Berlin (MFNB), Muséum National d’Histoire Naturelle, Paris (MNHN), National Museum

Accepted by A. Bezděk: 16 Oct. 2018; published: 4 Dec. 2018 1 of Nature and Science, Tokyo (NSMT), Entomological Museum, Northwest A&F University of China (NWAFU) and Shenyang Agriculture University (SYAU). The observations and measurements were made using a Leica EZ4 HD stereomicroscope with a Leica LAS EZ software. Photographs were taken with Nikon D7100 digital camera with a Nikon AF-S 60mm micro lens and a lambency box. Digital images of specimens and structures were captured using a multifocal Nikon SMZ25 stereomicroscope with a NIS-Elements software. Images were edited in Helicon Focus 6 and Adobe Photoshop CS6 (focus stacked, background removed). Specimens were dissected, and the genitals were removed and then tissues macerated in a hot water solution of 5-10% KOH for the extraction of genitalia. All the aedeagi were deposited in a plastic microtube with a mixture of ethanol and glycerine, attached to the specimen. Exact label data are cited for all material examined. Separate labels are separated by a double slash “//”, lines within each label are separated by a slash “/”, additional comments are in square brackets “[]”. All type specimens of newly described taxa are deposited in IZCAS, NWAFU, SYAU.

Descriptions of new species

Miridiba (Miridiba) bannaensis Gao & Fang, new species (Figs. 1, 6)

Type locality. CHINA: Yunnan Province: Xishuangbanna City. Type material examined. Holotype, male, labelled: “Xiaomengyang, Yunnan 850 m / 1957. V. 3 / Qiuzhen Liang [typeset, Chinese and Russian] // Holotrichia (P. ) imitatrix Brsk. ♂ / identified by Youwei Zhang 1961. VI [handwritten] // IOZ(E) 1967839 [typeset] // HOLOTYPE ♂ / Miridiba bannaensis sp. nov. / Chuanbu Gao and Hong Fang / det. 2018 [typeset, red label]”, deposited in IZCAS; paratype, female: “Xiaomengyang, Yunnan 850 m / 1957. V. 3 / Qiuzhen Liang [typeset, Chinese and Russian] // Holotrichia (P.) imitatrix Brsk. ♀ / identified by Youwei Zhang 1961. VI [handwritten] // IOZ(E) 2016205 [typeset] // PARATYPE ♀ / Miridiba bannaensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Yunnan Xishuangbanna Mengla / 1982-?-22/19 / Wang Sumei Zhou Jingruo [handwritten, Chinese] // PARATYPE ♂ / Miridiba bannaensis sp. nov. / Chuanbu Gao and Hong Fang / det. 2018 [typeset, yellow label]”, deposited in NWAFU; paratype, male: “Nannuoshan, Menghai, Yunnan 1200 m / 1957. IV. 29 / Lingchao Zang [typeset, Chinese and Russian] // H. imitatrix / genitalia / 62.2.17 [handwritten] // PARATYPE ♂ / Miridiba bannaensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS. Description of holotype (male). Body length 20.3 mm; width across humeri 8.5 mm, strongly convex, body oval-elongate, dorsal surface glabrous. Colour: Head, pronotum, scutellum and legs dark reddish brown; antennae, elytra and abdomen dark brown to dark reddish brown; shiny (Figs. 1a, b). Head: Frons densely punctate; clypeus with apex distinctly bilobed and reflexed; fronto-clypeal suture wave- shaped; frontal carina distinctly raised, weakly curved backwards at middle; clypeus shorter than frons, length ratio between clypeus and frons before carina 0.58; distance between eyes four times wider than eye (Fig. 1c). Antenna with 9 antennomeres; antennal club composed of 3 antennomeres, longer than antennomeres 2–6 combined (Fig. 1d). Thorax: Pronotal surface densely punctate and glabrous; pronotum widest near posterior half; anterior margin smooth and flanged; anterior margin with an arc-shaped incision at each end; lateral margin smooth and reflexed at anterior half; posterior margin smooth; anterolateral angles 90º, posterior angles obtuse and round (Fig. 1e). Prosternal process basiconic shaped, top flat. Scutellum triangular, dorsal surface glabrous and densely punctate, 1.43 times wider than long. Dorsal surface of elytra glabrous, sutural costae developed, epipleuron with cilia (Figs. 1a, b). Legs: Protibia tridentate, denticle 2 sharp; dorsal carina forking to denticle 2; apical spur reaching basal 2/5 of protarsomere 1. Metafemora moderately covered with long soft hairs near anterior and posterior margins; outer side of metatibia with 1 completed carina at distal 2/5, arc-shaped. Dorsolateral margin of metatibia has two thorns; dorsomedial margin with four thorns small to large (Fig. 1f); metatibia with two apical spurs of different sizes; metatarsomere 1 equal in length to metatarsomere 2; each metaclaw with a vertical tooth at middle (Fig. 1g).

2 · Zootaxa 4527 (1) © 2018 Magnolia Press GAO ET AL. FIGURE 1. Miridiba (M.) bannaensis Gao & Fang, new species, holotype. a, habitus, dorsal view; b, habitus, lateral view; c, head, dorsal view; d, antenna; e, pronotum, dorsal view; f, metatibia, lateral view; g, metaclaws; h, parameres, lateral view; i, paramere, dorsal view; j, endophallus, ventral view. Scale bar: 5 mm for a, b; 1 mm for c, e, f, h, i, j; 0.5 mm for d, g.

Abdomen: Lateral sides of abdominal sternites densely punctate and setiferous, setae short; posterior sternites 5 and 6 covered with long soft hairs. Pygidium: Fan-shaped pygidium punctate and setiferous, 1.38 times wider than long; dorsal surface covered with tiny setae, apical pygidium with long soft hairs; apical pygidium at a right angle. Male genitalia. Phallobase: Phallobase 1.07 times longer than paramere; dorsal surface with a depressed sulcus at middle; anterior 1/5 of phallobase constricted. Parameres: Parameres with four branches: two dorsal branches 1.35 times longer than two ventral branches. Dorsal branches extended forwards and curved inwards subapically, then divergent at apex; ventral sides of dorsal branches with several setae; basal third of paramere with two quadrangular plates on dorsum; ventral branch with a big cone-shaped hook ventrally before the apex (Figs. 1h, i). Endophallus with temones tapered in dorsum and epithelium in distal end; epithelium covered within soft sensillae densely and short spurs (Fig. 1j). Female. Antenna with 9 antennomeres; club formed with 3 antennomeres, slightly shorter than antennomeres 2–6 combined. Anterior metatibia slightly wider than in male. Variability. Both paratypes slightly differ in size (total body length 19.4–20.4 mm, width across humeri 8.4– 9.1 mm).

FOUR NEW SPECIES OF MIRIDIBA FROM CHINA Zootaxa 4527 (1) © 2018 Magnolia Press · 3 Diagnosis. Miridiba bannaensis new species can be separated from other Miridiba species by the following combination of characters: the punctures of pronotum and scutellum deep and rugose; the anterior margin has an incision at each end, the anterolateral angles prolonged forwards and moderately reflexed; in the paramere, distal end of ventral branches with a big cone-shaped hook along ventral margin near apex. Distribution. China (Yunnan: Puer, Xishuangbanna) (Fig. 6). Etymology. The name of the new species is from the type locality, Xishuangbanna. Chinese name. 版纳脊鳃金龟 Remarks. All specimens mentioned above of M. (M.) bannaensis new species were incorrectly identified as Holotrichia (Pledina) imitatrix Brenske, 1899 by Chang (1964). The two species can be separated by the following combination of characters: the shape of punctures on the scutellum (big and rugose in M. (M.) bannaensis new species; small in M. (M.) imitatrix;), the longitudinal carina in the middle of the clypeus (absent in M. (M.) bannaensis new species; present in M. (M.) imitatrix) and the form of the parameres (tips of dorsal and ventral branches bent downwards in M. (M.) bannaensis new species; dorsal branches slender and sharp, tips of ventral branches bent in M. (M.) imitatrix).

Miridiba (Miridiba) kuatunensis Gao & Fang, new species (Figs. 2, 6)

Type locality. CHINA: Fujian Province: Wuyishan Mountain. Type material examined. Holotype, male, labelled: “Guadun, Chong’an, Fujian / Chinese Academy of Sciences [handwritten or typeset, Chinese] // 1963.VII.10 / Collector Youwei Zhang [handwritten, Chinese] // Holotrichia pilosella Moser / Identified by Youwei Zhang 196I. VI [handwritten, Chinese] // IOZ (E)1967841 [typeset] // HOLOTYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang det. 2018 [typeset, red label]”, deposited in IZCAS; paratype, female: “Hujiang village, Fengyang Town, Lianxian County, Guangdong / Chinese Academy of Sciences [handwritten, Chinese] // 1965. 6. 17 / Chinese Academy of Sciences [typeset, Chinese] // Host: Vernicia fordii [Euphorbiaceae, handwritten, Chinese] // PARATYPE ♀ / Miridiba kuatunensis sp. nov. ♀ Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Jiuniutang, Maoershan, Guangxi / Chinese Academy of Sciences [handwritten or typeset, Chinese] /1985. VII. 10 [handwritten] // IOZ (E) 2016208 [typeset] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. ♂ / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Ningde, Fujian / 80. 5. 29 [handwritten] // Fujian Forestry Department / Melolonthidae / 008 [handwritten or typeset, Chinese] // H. (P.) pilosella Moser [handwritten] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female; “Miaoxiao, Fujian / 81-6-20 [handwritten] // Fujian Forestry Department / Melolonthidae / 008 // H.(P. ) pilosella Moser [handwritten or typeset, Chinese] // PARATYPE ♀ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label], deposited in IZCAS; paratype, male: “Beijing Museum of Natural History [typeset, Chinese] / Yanshan, Guangxi / Sikong Liu 1963. V. 28 [handwritten, Chinese] // Holotrichia pilosella Moser / Identified by Youwei Zhang 1988. VII. 11 [handwritten, Chinese] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Beijing Museum of Natural History [typeset, Chinese] / Qinglan, Hainan Island / Sikong Liu, 1965. II. 8 [handwritten, Chinese] // PARATYPE ♀ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “14 V. 33 S [handwritten] // FUKEIN / Jianou / Musée Heude [typeset] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “3247 / Songyang County, Zhejiang [handwritten, Chinese] // Holotrichia pilosella Moser 1991. XI. 13 / Identified by Zhiliang Zhang [handwritten, Chinese] // SYAU (E) 008 / Jin 3. 28 [handwritten, Chinese] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in SYAU; paratype, male: “Fujian / Zhang Zhiliang / 1998.7 [handwritten, Chinese] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in SYAU; paratype, male: “Jiuniutang, Maoershan, Guangxi / Chinese Academy of Sciences [Chinese] // 1985.VII.9 / Collector Subai Liao [Chinese] // PARATYPE ♂ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Chongan, Fujian [Chinese] / 80-6-9 /

4 · Zootaxa 4527 (1) © 2018 Magnolia Press GAO ET AL. Collected by team 3 [Chinese] // Fujian Forestry Department / Melolonthidae / 008 [handwritten or typeset, Chinese] // H. (P.) pilosella Moser [handwritten] // PARATYPE ♀ / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Jianyang, Aotou, Fujian [Chinese] / Chinese Academy of Sciences [Chinese] / 63. VI. 30 / Collector Youwei Zhang [handwritten] // Holotrichia pilosella Moser ♀ / Identified by Youwei Zhang [handwritten] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Xingcun Sangang, Chongan, Fujian / 740 m, Light / Chinese Academy of Sciences [handwritten or typeset, Chinese] // 1960. VI. 28 / Collector Yong Zuo [handwritten, Chinese] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 4 males and 6 females: “Dazhu, Yue / 900 – 1170 m / Chinese Academy of Sciences [handwritten or typeset, Chinese] // 28. V. 1960 / Jianhao Zhang [handwritten, Chinese] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female; “Fengyang, Hujiang / Lianxian, Guangdong / Chinese Academy of Sciences [Chinese] // 1965. V. 18 / Collector Youwei Zhang // Host Pyrus betulifolia [Rosaceae, handwritten, Chinese] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Beijing Museum of Natural History / Yanshan, Guangxi / Sikong Liu 1964. ?. 7 [typeset or handwritten, Chinese] // PARATYPE / Miridiba kuatunensis sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS. Description of holotype (male). Body length 17.3 mm, width across humeri 7.6 mm, body oval-elongate, strongly convex, dorsal surface densely setiferous, setae short. Colour: Head, pronotum, scutellum and legs dark reddish brown; antennae, elytra and abdomen brown to dark brown (Figs. 2a, b). Head: Frons densely punctate and setiferous; clypeus with anterior margin distinctly bilobed and reflexed; fronto-clypeal suture wave-shaped; frontal carina distinctly raised, weakly curved backwards; clypeus shorter than frons, length ratio between clypeus and frons before carina 0.56; distance between eyes three times wider than eye (Fig. 2c). Antenna with 9 antennomeres; club slightly longer than antennomeres 2–6 combined, length ratio 1.18 (Fig. 2c). Thorax: Dorsal surface of pronotum densely punctate and setiferous (Fig. 11); pronotum widest at middle; anterior margin flanged, lateral sides serrated; lateral margin serrated and moderately reflexed; posterior margin smooth; anterolateral angles 90º, posterior angles obtuse (Fig. 2d); prosternal process tongue-shaped. Scutellum triangular (Fig. 2e), 1.4 times wider than long, dorsal surface covered with dense short setae. Dorsal surface of elytra covered with dense short setae, epipleuron with lots of cilia (Figs. 2a, b). Legs: Protibia tridentate; denticle 2 and 3 sharp; dorsal carina forking to denticle 2 and 3; apical spur reaching basal one-fourth of protarsomere 1. Metafemora densely pubescent (Fig. 2f); distal 2/5 of outer side of metatibia with 1 transverse completed carina (Fig. 2g); dorsolateral margin with 1 thorn; dorsomedial margin with five thorns small to large; metatibia with two apical spurs of different sizes, spurs lanceolate shaped (Fig. 2g); metatarsomere 1 equal in length with metatarsomere 2. Abdomen: Abdominal sternites densely covered with short setae. Pygidium: Fan-shaped pygidium densely punctate and setiferous, setae short; 1.44 times wider than long, apical pygidium at a right angle. Male genitalia. Phallobase: Phallobase 1.41 times longer than paramere; dorsal surface with a depressed longitudinal sulcus at middle; anterior 1/5 of phallobase constricted. Parameres: Dorsal surface of parameres with two ladder-shaped plates at basal 2/5 and two pairs of branches at apex; dorsal branches 1.5 times longer than ventral branches. Dorsal branches thick, extended forwards and curved inwards subapically, then divergent at apex; ventral branches slender, tips curved outwards and downwards (Figs. 2h, i). Endophallus: Dorsal endophallus with temones tapered; medial endophallus with some small hook-shaped spurs and densely punctate sensillae (Fig. 2j). Female. Antenna with 9 antennomeres, club with 3 antennomeres; club equal in length to antennomeres 2–6 combined. Anterior metatibia slightly broader than in male. Variability. The known paratypes slightly differ in size (total body length: 17.3–18.5 mm, width across humeri 7.6–8.5 mm). Diagnosis. Miridiba (M.) kuatunensis new species is distinguished from M. (M.) pilosella (Moser, 1908) by the ratio between the dorsal branches and ventral branches of the parameres (1.25 in M. (M.) pilosella; 1.5 in M.

FOUR NEW SPECIES OF MIRIDIBA FROM CHINA Zootaxa 4527 (1) © 2018 Magnolia Press · 5 (M.) kuatunensis new species), and the curving of the dorsal branches of the parameres (the tips of the dorsal branches bent downwards, the angle of the bend is 55º in M. (M.) pilosella; the apex of dorsal branches only curved downwards (30º) and moderately expanded in M. (M.) kuatunensis new species). Distribution. China (Fujian: Jianou, Nanping, Ningde; Guangdong: Guangzhou, Qingyuan; Guangxi: Guilin; Hainan: Wenchang; Zhejiang: Lishui) (Fig. 6). Etymology. From the type locality, Guadun (= Kuatun) in Wuyishan of Fujian province.

FIGURE 2. Miridiba (M.) kuatunensis Gao & Fang, new species, holotype. a, habitus, dorsal view; b, habitus, lateral view; c, head, dorsal view; d, pronotum, dorsal view; e, scutellum; f, metafemora, ventral view; g, metatibia, lateral view; h, parameres, lateral view; i, parameres, dorsal view; j, endophallus. Scale bar: 5 mm for a, b; 1mm for c, d, f, g, j; 0.5 mm for e, h, i.

Chinese name. 挂脊鳃金龟 Remarks. According to the information on the specimen collection labels, adults of M. (M.) kuatunensis new species feed on Vernicia fordii (Euphorbiaceae) and Pyrus betulaefolia (Rosaceae).

Miridiba (Miridiba) xingkei Gao & Fang, new species (Figs. 3, 6)

Type locality. CHINA: Yunnan Province: Xishuangbanna City.

6 · Zootaxa 4527 (1) © 2018 Magnolia Press GAO ET AL. Type material examined. Holotype, male, labelled: “Menga, Xishuangbanna, Yunnan / 1050–1180 m / Chinese Academy of Sciences [typeset, Chinese] // 1958. V. 13 / Collector Pu Fuji [typeset, Chinese] // Holotrichia (P.) ciliatipennis Moser ♂ / Designed by You-wei Zhang [handwritten, Chinese] // HOLOTYPE ♂ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, red label]”, deposited in IZCAS; paratype, female: “Jingdong, Yunnan 1200 m / 1957. IV. 29 / A. Monchadsky [typeset, Chinese and Russian] // PARATYPE ♀ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Jingdong 1170 m / 1956. V. 26 / Zagulyaev lamp [typeset, Chinese and Russian] // PARATYPE ♂ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Xiaomengyang, Yunnan 850 m / 1957. V. 3 / Qiuzhen Liang [typeset, Chinese and Russian] // Holotrichia (P.) ciliatipennis Moser ♀ / Identified by Youwei Zhang 1981. VI [handwritten, Chinese] // PARATYPE ♀ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Yun Jinghong, Xishuangbanna, Yunnan / 650 m / Chinese Academic of Sciences [typeset, Chinese] // 1959-?-5 / Collector Xuezhong Zhang [typeset] // H. ciliatipennis Moser / genitalia / 62.3.19 [handwritten] // Holotrichia ciliatipennis Moser / Identified by Youwei Zhang [handwritten, Chinese] // IOZ(E)1967842 [typeset] // PARATYPE ♂ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Yun Jinghong, Xishuangbanna, Yunnan / 650 m / Chinese Academic of Sciences [typeset, Chinese] // 1958-V-11 / Collector Xuewu Meng [typeset] // Holotrichia ciliatipennis Moser / Identified by Youwei Zhang [handwritten, Chinese] // IOZ(E)1967836 [typeset] // PARATYPE ♂ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Yunpenghun, Xishuangbanna, Yunnan / 1200- 1400 m / Chinese Academic of Sciences [typeset, Chinese] // 1958-V-11 / Collector Xuewu Meng [typeset] // PARATYPE ♀ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 3 females: “Jingdong, Yunnan 1200 m / 1957. IV. 25 / A. Monchadsky [typeset, Chinese and Russian] // PARATYPE ♀ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Simao, Yunnan 1300 m / 1957. V. 9 / Fuji Pu [typeset, Chinese and Russian] // PARATYPE / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Jingdong 1170 m / 1956. ?. 1 / Zagulyaev lamp [typeset, Chinese and Russian] // PARATYPE ♂ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Yunnan Xishuangbanna Menghai / 1982-?- 16 / Wang Sumei, Zhou Jingruo [handwritten, Chinese] // C586 [handwritten] // PARATYPE ♀ / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in NWAUF; paratypes, 2 females: “Yunnan, Xishuangbanna, Menglong / Miridiba xingkei sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in NWAUF Description of holotype (male). Body length 22.8 mm; width across humeri 9.8 mm, oval-elongate, strongly convex, dorsal surface glabrous. Colour: head, pronotum, scutellum and legs dark reddish brown; antennae, elytra and abdomen brown (Figs. 3a, b). Head: Frons densely punctate and glabrous; clypeus arcuate shaped, apex weakly emarginate medially; anterior margin moderately reflexed; fronto-clypeal suture wave-shaped; frontal carina distinctly raised and nearly straight; clypeus shorter than frons, length ratio between clypeus and frons before carina 0.60; distance between eyes nearly four times wider than eye (Fig. 3c). Antenna with 9 antennomeres; club with 3 antennomeres, slightly longer than antennomeres 2-6 combined (Fig. 3d). Thorax: Dorsal surface of pronotum densely punctate and glabrous, widest at basal 2/5; anterior margin smooth and flanged; lateral margin smooth and broadly reflexed; posterior margin smooth; anterolateral angles obtuse, posterior angles obtuse and round. Prosternal process basiconic shaped. Scutellum triangular, dorsal surface densely punctate and glabrous, 1.58 times wider than long. Dorsal surface of elytra glabrous, sutural costae developed; epipleuron with long, dense cilia (Figs. 3a, b). Legs: Protibia tridentate, denticle 2 sharp; dorsal carina forking to denticle 2; apical spur of protibia sharp, apical spur reaching basal one half of protarsomere 1. Metafemora moderately covered with long soft hairs near anterior margin and rough setae near posterior margin (Fig. 3b); outside of metatibia with 1 completed carina at distal 2/5, carina arc-shaped; dorsolateral margin with 2 thorns; dorsomedial margin with 5 pubescent thorns small to large; metatibia with two apical spurs of different sizes, the big spur acinaciform, 1.72 times longer than the small spur (Fig. 3e); metatarsomere 1 equal in length to metatarsomere 2.

FOUR NEW SPECIES OF MIRIDIBA FROM CHINA Zootaxa 4527 (1) © 2018 Magnolia Press · 7 FIGURE 3. Miridiba (M.) xingkei Gao & Fang, new species, holotype. a, habitus, dorsal view; b, habitus, lateral view; c, head, dorsal view; d, antennae; e, apical spurs of metatibia, male; f, metatarsi, female; g, parameres, dorsal view; h, parameres, lateral view; i, parameres, ventral view; j, endophallus, dorsal view. Scale bar: 5 mm for a, b; 1 mm for c, d, e, f, g, h, i, j. Abdomen: Lateral sides of abdominal sternites densely punctate and setiferous, setae short; posterior sternites 5 and 6 covered with long soft hairs. Pygidium: Fan-shaped pygidium densely punctate and setiferous, 1.37 times wider than long, apical pygidium at a right angle; middle area weakly convex. Male genitalia. Phallobase: Phallobase 1.2 times longer than parameres; dorsal surface with a depressed longitudinal sulcus at middle; anterior 1/5 of phallobase weakly constricted. Parameres: Parameres with two pairs of branches: two thick long dorsal branches and two short ventral branches; each dorsal branch with a thick protuberance on dorsum; tip of each dorsal branch with a notch in the ventral side; ventral branch with a big cone- shaped hook ventrally before the apex (Figs. 3g–i). Endophallus: Dorsal endophallus with temones tapered; medial endophallus with small hooks; distal end of endophallus with a round seminal vesicle (Fig. 3j).

8 · Zootaxa 4527 (1) © 2018 Magnolia Press GAO ET AL. Female. Body slightly longer and broader than in male. Antenna with 9 antennomeres; club with 3 antennomeres, shorter than antennomeres 2–6 combined. Metafemora and apex of metatibia broader than in male. The big spur of apical metatibia broader and blunter than male, 1.3 times longer than the smaller spur (Fig. 3f). Variability. All the paratypes slightly differ in size (total body length 21.7–25.6 mm, width across humeri 9.5– 11.6 mm). Diagnosis. Miridiba (M.) xingkei new species and Miridiba (M.) ciliatipennis (Moser, 1913) are similar in the elytral epipleuron bearing dense, long cilia. The two species can be separated by following characters: the presence or absence of the midline on the posterior of the pronotum (absent in M. (M.) xingkei new species; present in M. (M.) ciliatipennis), the form of setae near the posterior margin of the metafemora (few large setae in M. (M.) xingkei new species, dense small setae in M. (M.) ciliatipennis), the shape of the spurs of the apical metatibia (arc- shaped in M. (M.) xingkei new species, straight in M. (M.) ciliatipennis), the form of the parameres (each dorsal branch with a developed protuberance in M. (M.) xingkei new species, the dorsal branches without protuberances in M. (M.) ciliatipennis). Distribution. China (Yunnan: Puer, Xishuangbanna) (Fig. 6). Etymology. This new species is dedicated to Dr Xingke Yang, a respected researcher, who has devoted himself into taxonomy and systematics study of Chinese Coleoptera for more than thirty years. He will retire from the Institute of Zoology, Chinese Academy of Sciences in 2018. Chinese name. 杨脊鳃金龟 Remarks. Chang (1964) listed M. (M.) ciliatipennis from China. However, we examined all specimens in IZCAS identified as M. (M.) ciliatipennis by Chang himself and they all belong to the new species M. (M.) xingkei. Based on this, we have excluded M. (M.) ciliatipennis from the Chinese fauna.

Miridiba (Miridiba) youweii Gao & Fang, new species (Figs. 4, 6)

Type locality. CHINA: Yunnan Province: Jingdong Yi Autonomous County. Type material examined. Holotype, male, labelled: “Jingdong, Yunnan 1170 m / 1956. V. 24 / Kryzhanovsky [typeset, Chinese and Russian] // Holotrichia (P.) hybrida Moser ♂ / Identified by Youwei Zhang 1961. VII [handwritten, Chinese] // IOZ(E) 1967838 [typeset] // HOLOTYPE ♂ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, red label]”, deposited in IZCAS; paratypes, 2 females: “Jingdong, Yunnan 1170 m / 1956. V. 20 / Benshou Zhou [typeset, Chinese] // Holotrichia (P.) hybrida Moser ♀ / identified by Youwei Zhang 1961. VI [handwritten, Chinese] // IOZ(E) 2016206 [typeset] // PARATYPE ♀ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 9 males and 3 females: “Jingdong, Yunnan 1170 m / 1956. V. 20 / Benshou Zhou [typeset, Chinese and Russian] // PARATYPE / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Jingdong, Yunnan 1170 m / 1956. V. 16 Kryzhanovsky lamp [typeset, Chinese] // PARATYPE ♂ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Simao, Yunnan 1300 m / 1957. V. 9 / Fuji Pu [typeset, Chinese] // PARATYPE ♂ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 2 males and 2 females: “Simao, Yunnan 1300 m / 1957. V. 9 / Guangji Hong [typeset, Chinese] // PARATYPE / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, male: “Jingdong, Yunnan 1200 m / 1957. IV. 25 / A. Monchadsky [typeset, Chinese] // PARATYPE ♂ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 14 males and 4 females: “Jingdong, Yunnan 1170 m / 1956. V. 22 / B. Popov [typeset, Chinese] // PARATYPE ♂ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 4 males: “Jingdong, Yunnan 1170 m / 1956. V. 22 / Zagulyaev [typeset, Chinese] // PARATYPE ♂ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 2 females: “Mengla County, Yunnan 370 mm / 1956. IV. 12 / Keren Huang etc. lamp [typeset, Chinese] // PARATYPE ♀ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 7 females: “Mengla County, Yunnan 370 mm / 1956. IV. 12–18 / Keren Huang etc. lamp [typeset, Chinese and Russian] // PARATYPE / Miridiba youweii sp. nov. /

FOUR NEW SPECIES OF MIRIDIBA FROM CHINA Zootaxa 4527 (1) © 2018 Magnolia Press · 9 Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Dong jiafen, Jingdong, Yunnan 1250 / 1956. V. 23 / Kryzhanovsky [typeset, Chinese] // PARATYPE ♀ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratype, female: “Jingdong, Yunnan 1200 m / 1957. V. 29 / A. Monchadsky [typeset, Chinese] // PARATYPE ♀ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, male and female: “Jingdong, Yunnan 1170 m / 1956. VI. 3 / Kryzhanovsky lamp [typeset, Chinese] // PARATYPE / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 22 males and 12 females: “Jingdong, Yunnan 1200 m / 1957. ?. 26–?. 29 / A. Monchadsky [typeset, Chinese and Russian] // PARATYPE / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, 13 males and 3 females: “Jingdong, Yunnan 1170 m / 1956. V. 21– 27 Kryzhanovsky lamp [typeset, Chinese and Russian] // PARATYPE / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in IZCAS; paratypes, male and female: “Yunnan, Xishuangbanna, Jinghong / (545 m) / 1974–5 11–15, 22–25 / Yao Zhou, Feng Yuan / Northwest Agriculture College [handwritten or typeset, Chinese] // PARATYPE / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in NWAFU; paratype, male: “Moganshan Lamp / 7.23 / Yanxia Chen [handwritten, Chinese] // PARATYPE ♂ / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in NWAFU; paratype, male: “Guizhou, Xingyi / 1979. X. 6 / Yang [handwritten, Chinese] // PARATYPE / Miridiba youweii sp. nov. / Chuanbu Gao & Hong Fang / det. 2018 [typeset, yellow label]”, deposited in SYAU. Description of holotype (male). Body length 24.0 mm, width across humeri 10.3 mm, body oval-elongate, dorsal surface glabrous. Colour: Head, pronotum, scutellum and legs dark reddish brown; antennae, elytra and abdomen dark brown (Figs. 4a, b). Head: Dorsal surface densely punctate and glabrous; clypeus arcuate, with apex weakly emarginate; anterior margin strongly reflexed; fronto-clypeal suture bilobed; frontal carina distinctly raised, weakly curved backwards; clypeus shorter than frons, length ratio between clypeus and frons before carina 0.55; distance between eyes nearly four times wider than eye (Fig. 4c). Antenna with 9 antennomeres; club with 3 antennomeres, equal in length to antennomeres 2–6 combined (Fig. 4e). Thorax: Pronotum widest at basal 1/3; dorsal surface densely punctate; anterior margin smooth and flanged; anterior margin with an incision at each end; lateral margin smooth and reflexed; posterior margin smooth; anterolateral angles 90º, posterior angles obtuse and round (Fig. 4d); prosternal process basiconic shaped, top flat. Scutellum triangular, dorsal surface glabrous and densely punctate, punctures tiny; 1.49 times wider than long. Dorsal surface of elytra glabrous, sutural costae developed, epipleuron with several short cilia (Figs. 4a, b). Legs: Protibia tridentate; dorsal carina forking to denticle 2; apical spur of protibia sharp, apical spur reaching basal 1/3 of protarsomere 1. Metafemora covered with long soft hairs near anterior and posterior margins (Fig. 4b); outer side of metatibia with 1 completed carina at distal 2/5, carina arc-shaped (Fig. 4f). Dorsolateral margin with 1 thorn; dorsomedial margin with 4 thorns small to large (Fig. 4f). Metatibia has two apical spurs of different sizes; the big spur lanceolate shaped, reaching basal 1/5 of metatarsomere 2; metatarsomere 1 shorter than metatarsomere 2. Abdomen: Lateral sides of abdominal sternites densely punctate and setiferous, setae short (Fig. 4b); middle area of sternites 3 and 4 sparsely setiferous; sternites 5 and 6 covered with long soft hairs. Pygidium: Fan-shaped pygidium setiferous and punctured; 1.49 times wider than long. Male genitalia. Phallobase: Phallobase 1.39 times longer than parameres; dorsal surface with a depressed longitudinal sulcus at middle; anterior 1/4 of phallobase constricted. Parameres: Parameres with two long dorsal branches and two short ventral branches; dorsal branches tapered forwards and bent downwards at basal 1/3, angle of bend 100º, apex curved inwards; ventral branches thick, tips bent outwards, angle of bend 90º (Figs. 4g, h). Endophallus: Temones slender and sclerous, colour black, consist of two sclerotised sclerites joined; top of temones with a cluster of short thorns; medial endophallus with thick thorns on dorsum and lots of thin thorns on ventral side; several sensillae on ventral side (Fig. 4i).

10 · Zootaxa 4527 (1) © 2018 Magnolia Press GAO ET AL. FIGURE 4. Miridiba (M.) youweii Gao & Fang, new species, holotype (a–i) and paratype (j). a, habitus, dorsal view; b, habitus, lateral view; c, head, dorsal view; d, pronotum, dorsal view; e, antennae; f, metatibia, lateral view; g, parameres, lateral view; h, parameres, dorsal view; i, endophallus, lateral view; j, female genitalia, dorsal view. Scale bar: 5 mm for a, b, j; 1 mm for c, d, f, g, h, i; 0.5 mm for e. Ag, Accessory gland; Bc, bursa copulatrix; Gc, genital chamber; Mo, median oviduct; Vt, vestigial tergite; Vs, vestigial sternite.

Female. Antenna with 9 antennomeres; club with 3 antennomeres, shorter than antennomeres 2–6 combined. Apex of metatibia wider than in male; the apical spurs of metatibia in female are broader and blunter than in male. Female genitalia (Fig. 4j). Female genitalia consists of a genital chamber, accessory glands, oviduct, median oviduct, spermatheca, spermathecal gland, bursa copulatrix. Genital chamber: Two pairs of symmetrical vestigial tergites located at both sides of rectum; terminal genital chamber with a pair of vestigial sternites ventrally, bilaterally symmetrical and setigerous. Accessory glands: horseshoe-shaped glands. Median oviduct: Median oviduct with 2 rounded sclerotised sclerites on lateral sides and 1 sclerotised sclerite on dorsum. Bursa copulatrix: pear-shaped. Spermatheca and spermathecal gland: tube-shaped.

FOUR NEW SPECIES OF MIRIDIBA FROM CHINA Zootaxa 4527 (1) © 2018 Magnolia Press · 11 Variability. The known paratypes slightly differ in size (total body length: 22.0–24.0 mm, width across humeri 10.0–12.2 mm). Diagnosis. Miridiba (M.) youweii new species is distinguished from Miridiba (M.) thai Keith, 2010 by numerous features including: the colour of the elytra (brown in M. (M.) youweii new species; yellow-brown in M. (M.) thai), the form of the prosternal process (basiconic shaped in M. (M.) youweii new species; cone-shaped in M. (M.) thai); the quantity of thorns on dorsomedial margin of metatibia (four in M. (M.) youweii new species; three in M. (M.) thai); the form of dorsal branches of parameres (slender and curved downwards at basal 1/3 in M. (M.) youweii new species; thick and tapered in M. (M.) thai); and quantity and shape of the thorns on the apex of the temones in the male (a cluster of thin and short thorns in M. (M.) youweii new species; four thick thorns in M. (M.) thai). Distribution. China (Yunnan: Dali, Honghe, Puer, Kunming, Xishuangbanna; Guizhou: Xingyi; Zhejiang: Moganshan) (Fig. 6). Etymology. It is with great pleasure that we name the new species for Mr Youwei Zhang who studied Chinese Melolonthinae taxonomy in his working life. Chinese name. 章脊鳃金龟 Remarks. All the above mentioned specimens of M. (M.) youweii new species deposited in IZCAS were incorrectly identified as Holotrichia (Pledina) hybrida (Moser, 1912) by Chang (1964). The two species can be separated by the form of the apex of dorsal branches of the parameres (sharp and setiferous in M. (M.) hybrida; clavate-shaped in M. (M.) youweii new species) and the shape of the ventral branches of the parameres (tapered and curved upwards in M. (M.) hybrida; tips vertically curved outwards in M. youweii new species).

Catalogue of Miridiba species known from China (including Chinese Mainland and Hainan and Taiwan Islands)

Altogether 18 Miridiba species distributed in China are confirmed. Some specimens of Miridiba deposited in IZCAS were incorrectly identified as Holotrichia (Pledina) ciliatipennis (Moser, 1913), H. (P.) hybrida (Moser, 1912), H. (P.) imitatrix (Brenske, 1899) or H. (P.) pilosella (Moser, 1908) by Chang (1964). Unfortunately, we have not found any Chinese specimens of H. ciliatipennis, H. hybrida or H. imitatrix until now. Although Holotrichia (Pledina) Hope, 1845 was not included into Miridiba by Coca-Abia (2008), we herein follow Li et al. (2015) and treat Holotrichia sinensis Hope, 1842 as a member of Miridiba.

Genus Miridiba Reitter, 1902

Miridiba Reitter, 1902: 170. Type species: Rhizotrogus trichophorus Fairmaire, 1891. Hippotrichia Arrow, 1948: 51. Type species: Hippotrichia hainana Arrow, 1948. Holotrochus Brenske, 1894: 75. Type species: Holotrochus vestitus Brenske, 1894. Primary junior homonym of Holotrochus Erichson, 1840 (Coleoptera: Staphylinidae). Holotrichia (Pledina) Hope, 1837. Type species: Holotrichia sinensis Hope, 1842. Shangaia Lucas, 1920: 592. Type species: Shangaia vestitus Lucas, 1920. Replacement name for Holotrochus Brenske. Neodontocnema Arrow, 1948: 50. Type species: Ancylonycha coromandeliana Blanchard, 1850.

Miridiba (Miridiba) aequabilis (Bates, 1891)

Lachnosterna aequabilis Bates, 1891: 75. Miridiba aequabilis: Coca-Abia 2008: 676.

Type locality. “Sze-chuen” (= China: Sichuan). Distribution. China (Sichuan). Remarks. Although we were unable to study types of M. (M.) aequabilis, the original description suggests the types were collected in Sichuan province.

Type locality. “China: Yunnan Province: Xishuangbanna City”. Distribution. China (Yunnan).

Miridiba (Miridiba) castanea (Waterhouse, 1875)

Holotrichia castanea Waterhouse, 1875: 104. Neodontocnema castanea: Arrow 1948: 51. Holotrichia (Pledina) castanea: Chang 1964:149. Miridiba castanea: Isida & Fujioka 1988: 35.

Type locality. “Kawachi” (= Japan: Osaka Prefecture: Kawachi). Type material examined. Lectotype, male, labelled: “S. / JAPAN [handwritten] // Holotrichia / castanea / (Type) C. Waterhouse [handwritten] // TYPE [typeset, red label] // Lectotype [typeset, blue label] // LECTOTYPE / Miridiba castanea / (Waterhouse, 1875) / M. Coca-Abia det. 2001 [handwritten or typeset, red label]”, deposited in BMHN; paralectotype, male: “S. / JAPAN [handwritten] // Holotrichia / castanea / C. Waterhouse [handwritten] // Paralectotype [typeset, blue label] // PARALECTOTYPE / Miridiba castanea / (Waterhouse, 1875) / M. Coca- Abia det. 2001 [handwritten or typeset, red label]”, deposited in BMHN. Distribution. China (North China, Sichuan), Japan, Korean Peninsula, Russia (Far East) (Chang 1964).

Miridiba (Miridiba) formosana (Moser, 1909)

Holotrichia formosana Moser, 1909: 470. Neodontocnema formosana: Arrow 1948: 51. Miridiba formosana: Nomura 1977: 88.

Type locality. “Formosa” (= China: Taiwan). Type material examined. Paralectotype, male: “Formosa / Koshum Distr. [handwritten] // formosana Mos. [handwritten] // Paralectotype ♂ / Miridiba formosana / (Moser, 1909) / M. Coca-Abia det., 2005 [typeset, red label]”, deposited in MFNB; paralectotype, female: “Formosa / Koshum Distr. [handwritten] // H. formosana / Type ♀ Mos. [handwritten] // SYNTYPE / Holotrichia / formosana, Moser 1909 / labelled MNHUB 2004 [typeset, red label] // Paralectotype ♀ / Miridiba formosana / (Moser, 1909) / M. Coca-Abia, det., 2005 [typeset, red label]”, deposited in MFNB. Distribution. China (Anhui, Fujian, Guangxi, Guizhou, Hebei, Hubei, Jiangsu, Jiangxi, Liaoning, Shandong, Shanxi, Sichuan, Zhejiang, Taiwan) (Nomura 1977; Liu 1997; Wei 1989; Zhang & Li 1997).

Miridiba (Miridiba) huesiotoi Li & Yang, 2015

Miridiba huesiotoi Li & Yang in Li et al. 2015: 524.

Type locality. “Taiwan: Tai Tung Co., Green Island”. Distribution. China (Taiwan).

Miridiba (Miridiba) kuatunensis Gao & Fang, new species

Type locality. “China: Fujian Province: Wuyishan Mountain”. Distribution. China (Fujian, Guangdong, Guangxi, Hainan, Zhejiang).

Miridiba kuraruana Nomura, 1977: 89.

Type locality. “Kenting” (= China: Taiwan: Kenting). Type material examined. Holotype, male, labelled: “KENTING / Park / FORMOSA / 12. VI. 1971 / Y. MAEDA [typeset, yellow label] // LIGHT [typeset] // ♂[handwritten] // Sizumu / NOMURA / Bequest, 1981 [typeset] // HOLOTYPE / Miridiba / kuraruana / NOMURA (1977) [handwritten, red label]”, deposited in NSMT; paratype, male: “KENTING- / Park / TAIWAN / 2. IV. 1970 / S.CHO [typeset, yellow label] // ♂ [handwritten]// PARATYPE / Miridiba / kuraruana / NOMURA (1977) [handwritten or typeset]”, deposited in NSMT; paratype, female: “Kenting / Taiwan / 7 V 1977 / M. Sakaina [handwritten] // ♀[handwritten] // Sizumu / NOMURA / Bequest, 1981 [typeset] // PARATYPE / Miridiba / kuraruana NOMURA (1977) [handwritten or typeset]”, deposited in NSMT; paratype, male: “Ken ding / Date: 19-V-1973 | K. MASUMOTO leg. [handwritten or typeset] // ♂ [handwritten]// B. M. 1985 / -385 [handwritten] // Paratype / Miridiba / kuraruana / MOMURA, 1977 [handwritten or typeset, pink label]”, deposited in BMHN; paratype, female: “Ken ding / Date: 19-V-1973 / K. MASUMOTO leg. [handwritten or typeset] // ♀ [handwritten] // Paratype / Miridiba / kuraruana / NOMURA, 1977 [handwritten or typeset, pink label]”, deposited in BMHN. Distribution. China (Taiwan).

Miridiba (Miridiba) obscura Itoh, 1995 stat. nov. (Figs. 5a–c, 6)

Miridiba tuberculipennis obscura Itoh, 1995: 199.

Type locality. “Doi Suthep” (= Thailand: Doi Suthep). Type material examined. Paratype, male, labelled: “Doi mae Salong / near Chiang mai / N. Thailand / 21-?- 1992 / K. Kawano leg. [handwritten] // Paratype ♂ / Miridiba / tuberculipennis / obscura T. ITOH / 1995 [typeset]”, deposited in MFNB; paratype, female: “Doi suthap / near Chiang mai / N. Thailand / 3-V-1988 / Y. Kuwahara leg. [handwritten] // Paratype ♀ / Miridiba / tuberculipennis / obscura T. ITOH / 1995 [typeset]”, deposited in MFNB. Additional material examined. Male, labelled: “Yunnan, Xishuangbanna, Menghun / 1200 m / Chinese Academy of Sciences [typeset, Chinese] // 1958-V-11 / Collector Xuwu Meng [typeset, Chinese] // Miridiba obscura Itoh, 1995 / Chuanbu Gao det. 2018 [handwritten]”, deposited in IZCAS; 3 males and 3 females: “Yunnan, Menghai / Chinese Academy of Sciences [typeset, Chinese] // 1982 / Collector Binjia Lin [handwritten, Chinese] / / Miridiba obscura Itoh, 1995 / Chuanbu Gao det. 2018 [handwritten]”, deposited in IZCAS; female: “39-14 / Yunnan, Yangbi [handwritten, Chinese] // Miridiba obscura Itoh, 1995 / Chuanbu Gao det. 2018 [handwritten]”, deposited in IZCAS; male: “Yunnan, Nangunhe Nature Reserve, Gengma, Furong / Xiaochen Zhang 126a / 2007- 6-10 / NWAFU [handwritten, Chinese] // Miridiba obscura Itoh, 1995 / Chuanbu Gao det. 2018 [handwritten]”, deposited in NWAFU; female: “Yunnan, Nan Gunhe Nature Reserve, Gengma, Furong / Chong Wei 126a / 2007-7- 10 / NWAFU [handwritten, Chinese] // Miridiba obscura Itoh, 1995 / Chuanbu Gao det. 2018 [handwritten]”, deposited in NWAFU. Distribution. China (Yunnan) (Fig. 6), Thailand, Laos (Itoh 1995). Remarks. Newly recorded for China. One female of M. (M.) tuberculipennis obscura Itoh, 1995 and one male of M. (M.) tuberculipennis Fairmaire, 1891 were collected in the same place Yangbi County of Yunnan province (see additional material examined). We therefore propose that M. (M.) tuberculipennis obscura should be elevated to species status as M. (M.) obscura Itoh, 1995. The two species can be separated by the shape of the clypeus (moderately bilobate in M. (M.) tuberculipennis while arcuate in M. (M.) obscura), and by the shape of the dorsal and ventral branches of the parameres (thin in M. (M.) tuberculipennis while thick and expanded in M. (M.) obscura) (Figs. 5a−f).

14 · Zootaxa 4527 (1) © 2018 Magnolia Press GAO ET AL. FIGURE 5. Miridiba (M.) obscura Itoh, 1995 (a, c, e) and M. (M.) tuberculipennis (Moser, 1913) (b, d, f). a, b, habitus, dorsal view; c, d, parameres, lateral view; e, f, parameres, ventral view. Scale bar: 5 mm for a, b; 1 mm for c, d, e, f.

Miridiba (Miridiba) pilosella (Moser, 1908)

Holotrichia pilosella Moser, 1908: 336. Miridiba pilosella: Coca-Abia 2008: 681.

FOUR NEW SPECIES OF MIRIDIBA FROM CHINA Zootaxa 4527 (1) © 2018 Magnolia Press · 15 Type locality. “Montes Mauson” (= Northern Vietnam: Montes Mauson). Type material examined. Syntype, male, labelled: “Tonkin / Montes Mauson / April Mai 2-3000´ / H. Fruhstorfer [typeset] // Holotrichia / pilosella / Type ♂ Mos. [handwritten] // H. pilosella / Mos. [typeset]”, deposited in MFNB. Additional material examined. Male: “Tonkin [typeset] // H. pilosella / Mos. [typeset]”, deposited in MFNB; female: “China / Canton / Lehmann S [typeset] // H. pilosella / Mos. [typeset]”, deposited in MFNB. Distribution. China (Guangdong), Vietnam. Remarks. Newly recorded for Guangdong province.

Miridiba (Pledina) sinensis (Hope, 1845)

Holotrichia sinensis Hope, 1842: 60, 1843: 63, 1845: 8. Ancylonycha sinae Blanchard, 1851: 139, Burmeister 1855: 136 (junior synonym of M. (P.) sinensis). Holotrichia (Pledina) sinensis: Reitter 1902: 174, Smetana & Král 2006: 219. Miridiba (Pledina) sinensis: Nomura 1977: 88, Miyake 1991: 9, Li et al. 2015: 533, Bezděk 2016: 272. Rhizotrogus cribellatus Fairmaire, 1891: 200, Keith 2006: 43 (junior synonym of M. (P.) sinensis).

Type locality. “Canton” (= China: Guangzhou). Type material examined. Lectotype, male, labelled: “China / Canton [handwritten] // 60·15 / E.I.C [typeset] / Sinensis. Hope. [handwritten] // Lectotype / Miridiba sinensis (Hope, 1845) / CH. Bu Gao & M. Coca-Abia, 2017 [typeset, red label]”, deposited in BMNH. Additional material examined. Two males, labelled: “Hainan / 1952, Summer [handwritten, Chinese] // Holotrichia. sinensis Hope / Identified by Zhiliang Zhang [handwritten, Chinese]”, deposited in SYAU; male: “Hainan Islands, Jian Fengling / 1992-4-5 / Guangchun Liu, Min Wang / Northwest Agriculture University [typeset, Chinese]”, deposited in NWAFU; male: “Yunnan, Mengyang 790 m / 1991-?-8 / Liu Guangchun, Cai Wanzhi / NWAFU [typeset, Chinese] // Miridiba sinensis / (Hope, 1845) / (GCHB) det. 2018”, deposited in NWAFU. Distribution. China (Fujian, Hainan, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Jiangsu, Jiangxi, Shandong, Taiwan, Yunnan, Zhejiang) (Chang 1964; Wei 1989; Zhang & Li 1997). Remarks. Newly recorded for Hainan and Yunnan provinces.

Miridiba (Miridiba) sus (Moser, 1912)

Holotrichia sus Moser, 1912: 443. Hippotrichia hainana Arrow, 1948: 51; Chang 1964: 145 (junior synonym of M. (M.) sus). Miridiba sus: Itoh 1995: 199; Coca-Abia, 2008: 682.

Type locality. “Cochinchina (Kuang-toi)” (= Vietnam: Kuang Tai). Type material examined. Syntype, male of Hippotrichia hainana, labelled: “Hainan I. / J. Whitehead. / 99. 315 [typeset] // Hippotrichia / hainana / Type Arrow [handwritten] / Type [typeset, red label]”, deposited in BMNH. Distribution. China (Hainan, Yunnan), Laos, Thailand, Vietnam (Arrow 1948; Chang, 1964; Itoh 1995; Moser 1912).

Miridiba (Miridiba) taipei Wang & Li, 2015

Miridiba taipei Wang & Li in Li et al. 2015: 530.

Type locality. “Taipei County: Lin Ko”. Distribution. China (Taiwan).

Miridiba taoi Li & Wang in Li et al. 2015: 528.

Type locality. “Taiwan, Tai Tung Co., Lan Yu Is.”. Type material examined. Paratype, male, labelled: “TAIWAN: Tai Tung Co / Lan Yu Is. / 23-25/?/1992 / collr. C.-L. Li [typeset] // BMNH (E) / 2015 – 121 / Chun-Lin Li [typeset] // PARATYPE / Miridiba (Miridiba) / taoi Li & Yang, 2015 / n. sp. [typeset, yellow label]”, deposited in BMNH. Distribution. China (Taiwan).

Miridiba (Miridiba) trichophora (Fairmaire, 1891)

Rhizotrogus trichophorus Fairmaire, 1891: 199. Miridiba trichophora: Reitter 1902: 170. Holotrochus vestitus Brenske, 1894: 75, Coca-Abia 2008: 674 (junior synonym of M. (M.) trichophora).

Type locality. “Tchang-Yang” (= China: Hubei: Changyang). Type material examined. Paralectotype, male, labelled: “Rhizotrogus / trichophorus / Fairm / Tchang Yang [handwritten] // MUSÉUM PARIS / 1906 / Coll. Léon FAIRMAIRE [typeset] // TYPE [typeset, red label] // Paralectotype / Miridiba trichophora (Fairmaire, 1891) / Chuan-bu Gao & / Coca-Abia det. 2017 [typeset, red label]”, deposited in MNHN. Distribution. China (Anhui, Beijing, Fujian, Gansu, Guizhou, Hebei, Henan, Hubei, Jiangsu, Jiangxi, Liaoning, Neimongol, Shaanxi, Shandong, Shanghai, Shanxi, Sichuan, Tianjin, Zhejiang) (Chang 1964; Liu, 1997; Wei, 1989).

Miridiba (Miridiba) tuberculipennis (Moser, 1913) (Figs. 5b, d, f, 6)

Holotrichia tuberculipennis Moser, 1913: 55. Neodontocnema tuberculipennis: Arrow 1948: 51. Miridiba tuberculipennis: Itoh 1995: 199, Coca-Abia 2008: 683, Keith 2010: 232. Neodontocnema ardoini Frey, 1970: 245, Keith 2006: 45 (junior synonym of M. tuberculipennis).

Type locality. “Burma” (= Myanmar). Type material examined. Lectotype, male, labelled: “A. K. Weld Downing / Burma [typeset] // Holotrichia / tuberculipennis / Mos. Type ♂ [handwritten] // Zool. Mus. / Berlin [typeset] // SYNTYPUS / Holotrichia / tuberculipennis Moser, 1913 / labelled by MNHUB, 2004 [typeset, red label] // Lectotype ♂ / Miridiba tuberculipennis / (Moser, 1913) / M. Coca-Abia det., 2005 [typeset, red label]”, deposited in MFNB; paralectotype, female: “A. K. Weld Downing, / Burma [typeset] // tuberculipennis Mos. [handwritten] // Holotrichia / tuberculipennis / Mos. Type ♀ [handwritten] //Zool. Mus. / Berlin [typeset] // SYNTYPUS / Holotrichia / tuberculipennis Moser, 1913 / labelled by MNHUB, 2004 [typeset, red label] // Paralectotype / Miridiba tuberculipennis / (Moser, 1913) / M. Coca-Abia det., 2005 [typeset, red label]”, deposited in MFNB. Additional material examined. Male, labelled: “No 2 / Yunnan, Yangbi [handwritten, Chinese] // 39–14 [handwritten] // Holotrichia (P.) / hybrida Moser / Identified by Youwei Zhang [handwritten, Chinese] // Miridiba tuberculipennis (Moser, 1913) / Chuanbu Gao det. 2018 [handwritten]”, deposited in IZCAS. Distribution. China (Yunnan) (Fig. 6), Laos, Myanmar, Vietnam (Frey 1970; Moser 1913). Remarks. Miridiba (M.) tuberculipennis is newly recorded for China.

Holotrichia (Pledina) wangi Zhang in Zhang & Li 1997: 773. Miridiba wangi: Bezděk, 2016: 272.

Type locality. “ 四川长寿县楠木园 ” (= China: Chongqing City: Changshou District). Type material examined. Holotype, male, labelled: “Collect Number Gui-13 / Collecttion Site Changshou County, Nan Muyuan / Name Scarab beetle / Collection Date 94. 5. 6 [handwritten, Chinese] // Holotrichia (Pledina) / wangi Zhang. / sp. nov. / Identified by Youwei Zhang 1995. V. [handwritten, Chinese] // IOZ(E) 218205 [typeset, blue label] // HOLOTYPE [typeset, red label]”, deposited in IZCAS. Distribution. China (Chongqing).

Miridiba (Miridiba) xingkei Gao & Fang, new species

Type locality. “China: Yunnan Province: Xishuangbanna City”. Distribution. China (Yunnan).

Miridiba (Miridiba) youweii Gao & Fang, new species

Type locality. “China: Yunnan Province: Jingdong Yi Autonomous County”. Distribution. China (Guizhou, Yunnan, Zhejiang).

FIGURE 6. Distribution map for six Miridiba species in China.

Acknowledgements

We are grateful to Johannes Frisch (curator of Coleoptera collection, Leibniz-Institut für Evolutions und Biodiversitätsforschung, MFNB), Maxwell V.L. Barclay (curator of Coleoptera collection, BMNH), Olivier Montreuil (MNHN), Shuhei Nomura (Department of Zoology, NSMT), Xingke Yang (Researchers of Key Laboratory of Zoological Systematics and Evolution, IZCAS), and Yan Ma (College of Plant Protection, NWAFU) for sharing their specimens in this study. We thank Jon Gelhaus (Drexel University), Yan Li, Ying Lu and Lu Jiang (Shenyang Agriculture University) for providing constructive reviews of this paper. We also thank Aleš Bezděk

18 · Zootaxa 4527 (1) © 2018 Magnolia Press GAO ET AL. (Biology Centre CAS, Institute of Entomology, České Budějovice, Czech Republic) and Chun-Lin Li (National Taiwan University, Taiwan) for evaluating the manuscript and providing lots of valuable suggestions. This research was supported by the National Natural Science Foundation of China (no. 31672345), Research Equipment Development Project of Chinese Academy of Sciences (YZ201509). This work was supported by China Scholarship Council Foundation to the first author.

References

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