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Three New Species of the Genus Drilonius (Coleoptera: Omethidae) from Indochina Три Новых Вида Рода Drilonius (Coleoptera: Omethidae) Из Индокитая

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Three New Species of the Genus Drilonius (Coleoptera: Omethidae) from Indochina Три Новых Вида Рода Drilonius (Coleoptera: Omethidae) Из Индокитая ZOOSYSTEMATICA ROSSICA, 23(1): 111–117 25 JUNE 2014 Three new species of the genus Drilonius (Coleoptera: Omethidae) from Indochina Три новых вида рода Drilonius (Coleoptera: Omethidae) из Индокитая S.V. KAZANTSEV С.В. КАЗАНЦЕВ S.V. Kazantsev, Insect Centre, 13-326 Donetskaya Str., Moscow 109651, Russia. E-mail: [email protected] Three new omethid species, Drilonius fedorenkoi sp. nov. from Vietnam, as well as D. hol- zschuhi sp. nov. and D. nyx sp. nov. from Laos are described. Male habitus and aedeagi of the new species are figured. Описаны три новых вида ометид: Drilonius fedorenkoi sp. nov. из Вьетнама, а также D. hol- zschuhi sp. nov. и D. nyx sp. nov. из Лаоса. Для новых видов приведены иллюстрации внешнего вида самца и эдеагуса. Key words: omethids, taxonomy, Oriental region, Indochina, Coleoptera, Omethidae, Drilo- nius, new species Ключевые слова: ометиды, таксономия, Ориентальный регион, Индокитай, Coleoptera, Omethidae, Drilonius, новые виды INTRODUCTION publications on Drilonius (Wittmer, 1995; Kazantsev, 2009, 2010). The family Omethidae was erected in A possibility to study omethids collected 1972 to accommodate three branches of in eastern Asia allows to further contribute cantharoids: Omethinae, previously in to the knowledge of the representatives of Cantharidae; Matheteinae, previously in this beetle group. Three new Drilonius spe- Lampyridae; and Driloniinae, previously in cies were found in the material from Viet- Drilidae (Crowson 1972). nam and Laos. Descriptions of the new spe- The subfamily Omethinae has a trans- cies are given below. Beringian, Nearctic – Eastern Palaearctic distribution and is known by five genera and seven species from North America and MATERIAL AND METHODS one genus (Omethes LeConte, 1861) and one species from Japan. Matheteinae (with The studied material was glued on card- two genera and three species) is exclusively board plates. For examination, the beetles Nearctic, while Driloniinae (including only were relaxed in water, then their detached Drilonius Kiesenwetter, 1874 with approxi- abdomina were put for several hours in mately two dozen species) is confined to 10% KOH at room temperature. The KOH eastern Asia (Ramsdale, 2010). treated aedeagi and terminal abdominal Although the family is very poorly segments were placed in microvials with known morphologically as well as systemat- glycerin. MSP-1 zoom stereoscopic dissect- ically (e.g. Ramsdale, 2010), little has been ing microscope with ×8 – ×80 magnification done recently to this end. Exceptions were range was used. Photographs were taken © 2014 Zoological Institute, Russian Academy of Scienсes 112 S.V. KAZANTSEV. NEW SPECIES OF DRILONIUS FROM INDOCHINA with Canon EOS 6D camera with Canon Aedeagus with elongate distally pro- MP-E 65 mm lens. duced and curved parameres; ventral lobe The following acronyms are used in with long narrow incision and acutely this paper: ICM, Insect Center, Moscow; produced dents; laterophyses distally pro- ZMMU, Zoological Museum of Moscow duced, with two rows of brushes (Fig. 2). University; ZIN, Zoological Institute, Rus- Female. Unknown. sian Academy of Sciences, St Petersburg. Length: 5.45 mm. Width (humerally): 1.45 mm. TAXONOMY Comparison. Drilonius fedorenkoi sp. nov. is easily distinguishable from all conge- Order COLEOPTERA nerics by the semicircular anteriorly prono- tum with acute posterior angles and reddish Family OMETHIDAE elytral pubescence (Fig. 1), as well as by the Subfamily DRILONIINAE long narrow incision with acutely produced dents of the ventral lobe of parameres and Genus Drilonius Kiesenwetter, 1874 other details of the aedeagus (Fig. 2). Drilonius fedorenkoi sp. nov. Etymology. The new species is named af- (Figs 1, 2) ter Dmitry N. Fedorenko (Moscow, Russia), the collector of its unique type specimen. Holotype. Male; Southern Vietnam, Lam Dong Prov., Bi Doup – Nui Ba Nature Reserve, Drilonius holzschuhi environs of Long Lanh, 12°10´N, 108°40´E, sp. nov. 1400–1800 m, 1–22 Apr. 2008, coll. D. Fedo- (Figs 3, 4) renko (ICM). Holotype. Male; Northeastern Laos, Hua Description. Male. Dark brown to black; Phan Prov., Ban Saleui, Phou Pan Mt., ~20°12´N, elytral apices red; elytral pubescence red- 104°01´E, 1300–1900 m, 1–31 May 2011, coll. dish brown (Fig. 1). C. Holzschuh (ICM). Eyes small (interocular distance about Paratypes. Four males and 6 females, same 1.8 times greater than eye diameter). An- data as for holotype (ICM). tennae flabellate, attaining to elytral two Description. Male. Black; abdomen later- thirds, with antennomere 3 about 2.5 times ally pinkish-red. longer than antennomere 2 and 1.3 times Eyes small (interocular distance about 2 shorter than antennomere 4; flabellum of times greater than eye diameter). Antennae antennomere 8 about 1.2 times longer than flabellate, attaining to elytral two thirds, antennomere (Fig. 1). with antennomere 3 about 2.3 times longer Pronotum transverse, about 1.8 times than antennomere 2 and 1.1 times shorter wider than long, semicircularly produced than antennomere 4; flabellum of antenno- anteriorly and bisinuate posteriorly, strong- mere 8 about 1.2 times longer than anten- ly narrowed anteriorly, glabrous and shin- nomere (Fig. 3). ing medially, with deep longitudinal depres- Pronotum transverse, about 1.6 times sions in middle of each half and acute pos- wider than long, broadly convex anteriorly terior angles. Scutellum elongate, parallel- and posteriorly, with pronounced anterior sided, rounded at apex (Fig. 1). and rounded posterior angles; punctuation Elytra long, about 3.1 times longer than large and sparse, with almost glabrous me- wide at humeri, noticeably concave at sides; dian elevation. Scutellum elongate, paral- all four longitudinal costae reaching ely- lel-sided, shortly incised at apex (Fig. 3). tral apices; interstices with regular rows of Elytra long, about 2.9 times longer transverse rectangular cells; pubescence than wide at humeri, almost parallel-sided, short and relatively dense, denser on longi- slightly concave at sides; all four longitudi- tudinal costae (Fig. 1). nal costae reaching elytral apices; interstic- © 2014 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 23(1): 111–117 S.V. KAZANTSEV. NEW SPECIES OF DRILONIUS FROM INDOCHINA 113 Figs 1–2. Drilonius fedorenkoi sp. nov., holotype, male: 1, general view; 2, aedeagus, ventral view. Scale bar: 0.5 mm. © 2014 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 23(1): 111–117 114 S.V. KAZANTSEV. NEW SPECIES OF DRILONIUS FROM INDOCHINA Figs 3–4. Drilonius holzschuhi sp. nov., holotype, male: 3, general view; 4, aedeagus, ventral view. Scale bar: 0.5 mm. © 2014 Zoological Institute, Russian Academy of Scienсes, Zoosystematica Rossica 23(1): 111–117 S.V. KAZANTSEV. NEW SPECIES OF DRILONIUS FROM INDOCHINA 115 es with rows of transverse rectangular cells; anteriorly sides and blunt posterior angles; pubescence uniform, short and relatively punctuation fine and dense. Scutellum scarce (Fig. 3). elongate, narrow, parallel-sided, narrowly Aedeagus with elongate, distally curved incised at apex (Fig. 5). parameres; ventral lobe with long narrow Elytra long, about 3.2 times longer than incision and convex distal margin; latero- wide at humeri, slightly concave at middle physes distally transverse, with two rows of and widening in distal third; all four longi- brushes (Fig. 4). tudinal costae reaching elytral apices; inter- Female. Similar to male, but antennae stices with rows of transverse rectangular with shorter flabellae. cells; pubescence uniform, short and rela- Length: 5.0–5.5 mm. Width (humer- tively scarce (Fig. 5). ally): 1.4–1.9 mm. Aedeagus with elongate, distally pro- Comparison. Drilonius holzschuhi sp. duced and curved parameres; ventral lobe nov. can be separated from D. niger (Pic, with relatively short broad incision and 1927) and D. nyx sp. nov. by the pinkish- straight distal margin; laterophyses distally red abdominal sides and longer antennal acute, with one brushed strip, with longer lamellae (Fig. 3); additionally, it is distin- bristles distally (Fig. 6). guishable from D. nyx sp. nov. by the larger Female. Similar to male, but antennae and sparser pronotal punctuation (Fig. 3), less serrate. as well as by the evenly rounded sides of the Length: 5.7–7.4 mm. Width (humer- incision of the ventral lobe of parameres and ally): 1.4–2.0 mm. transverse apices of laterophyses and other Comparison. Drilonius nyx sp. nov. can details of the aedeagus (Fig. 4). be separated from D. niger (Pic, 1927) by Etymology. The new species is named the fine and dense pronotal punctuation; after Carolus Holzschuh (Villach, Austria), it is readily distinguishable from D. hol- who collected its type series. zschuhi sp. nov. by the shorter antennal lamellae (Fig. 5), uniformly dark brown Drilonius nyx sp. nov. abdomen, as well as by the relatively short (Figs 5, 6) broad incision with straight distal margin of the incision of the ventral lobe of para- Holotype. Male, Northeastern Laos, Hua meres and longitudinally produced apices Phan Prov., Ban Saleui, Phou Pan Mt., ~20°12´N, of laterophyses and other details of the ae- 104°01´E, 1300–1900 m, 1–31 May 2011, coll. C. Holzschuh (ICM). deagus (Fig. 6). Paratypes. Twenty three males and 9 females, Etymology. The new species is named same data as for holotype (ICM, ZMMU, ZIN). after the Greek goddess of darkness and Description. Male. Dark brown to black; night, alluding to its almost uniformly dark metatrochanters brownish; adhesive lobes brown to black coloration. of tarsomeres 3 and 4 yellowish. Eyes small (interocular distance about ACKNOWLEDGEMENTS 1.75 times greater than eye diameter). An- tennae strongly serrate, attaining to elytral It is my pleasant duty to express gratitude three fifths, with antennomere 3 about 1.5 to Dmitry N. Fedorenko (Moscow, Russia) and Carolus Holzschuh (Villach, Austria) for the times longer than antennomere 2 and 1.1 opportunity to study material collected during times shorter than antennomere 4; dent of their entomological expeditions to Indochina. antennomere 8 about 1.7 times shorter than antennomere (Fig. 5). REFERENCES Pronotum transverse, about 1.5 times wider than long, convex anteriorly and pos- Crowson R.A.
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