Coleoptera: Carabidae: Helluonini) of China, with Descriptions of Seven New Species
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POLISH JOURNAL OF ENTOMOLOGY POLSKIE P I S M O ENTOMOLOGICZNE VOL. 79 : 3-23 Bydgoszcz 30 March 2010 A review of the genus Macrocheilus HOPE (Coleoptera: Carabidae: Helluonini) of China, with descriptions of seven new species DANYANG ZHAO 1, 2 , MINGYI TIAN 1, * 1) Department of Entomology, College of Natural Resources & Environment, South China 2) Agricultural University, Wushan, Guangzhou, 510640, China, * e-mail: [email protected] ABSTRACT. In the present paper a review of the genus Macrocheilus HOPE , 1838 (Coleoptera: Carabidae: Helluonini) of China is provided, with descriptions of seven new species, viz. M. parvimacu- latus sp. nov. , M. gigas sp. nov. , M. fuscipennis sp. nov. , M. solidipalpis sp. nov. , M. cheni sp. nov., M. quadratus sp. nov. , and M. sinuatilabris sp. nov. A key to all species found in China is also given. In addition, M. asteriscus White is reported from Laos, Indonesia and India for the first time. KEY WORDS: Coleoptera, Carabidae, Helluonini, Macrocheilus , review, new species, China. INTRODUCTION Macrocheilus HOPE , 1838 is the largest genus within the tribe Helluonini. Forty-eight spe- cies of the genus have been reported so far (LORENZ 2005), with thirty-four from the Afro- tropical Region, twelve from the Oriental Region and two from the Palaearctic Region. The Oriental fauna of Macrocheilus have been treated by ANDREWES (1920) and JEDLI ČKA (1963). Up to now only four species of Macrocheilus are known from China (ANDREWES , 1930, CSIKI 1933, JEDLI ČKA 1963, HŮRKA 2003). The first record of Macrocheilus from China was M . asteriscus from Hong Kong (WHITE 1844). BATES (1892) reported the occu- rrence of M. bensoni HOPE , 1838 from Hong Kong too. ANDREWES (1920) described M. vitalisi from China but its type locality was not given. Then, ANDREWES and SCOTT (1924) recorded M. chaudoiri ANDREWES , 1919 (= M. trimaculatus CHAUDOIR , non OLI - VIER ) from Macao. 4 Polish Journal of Entomology 79 (1) MATERIAL AND METHODS Majority of the materials studied were from the Insect Collection of South China Agricul- tural University, Guangzhou (SCAU) and the rest were from Muséum National d’Histoire Naturelle, Paris (MNHN), the National History Museum, London (NHML), and Guangxi Agricultural Academy of Sciences (Nanning, China). Dissection of specimens was made following the standard technique described by Lindroth (1974). Observations and measurements were made under stereo microscope (Leica, MZ125). Abbreviations of measurements used in the text are as follows: Length of head (HL): linear distance from apex of labrum to posterior transverse mar- gin; Width of head (HW): maximum distance across head including eyes; Length of pronotum (PL): linear distance from anterior to posterior margin, measured along the midline; Width of pronotum (PW): greatest transverse distance; Length of elytra (EL): linear distance from base to apex, through elytral suture; Width of elytra (EW): greatest linear transverse distance across both elytra. Genus Macrocheilus HOPE , 1838 Macrocheilus HOPE , 1838: 166. Type species: Macrocheilus bensoni HOPE , 1838. JEAN- NEL , 1949: 1041. Acanthogenius REICHE , 1842: 334. Type species: Helluo impictus WIEDEMANN , 1823. Diagnosis Medium sized (length from 8.0 to17.0 mm), elongate, whole body coarsely punctate and pubescent, except for labrum and middle region of ventral side of head (Figs 31-45). Head with two supraorbital setae on each side; ligula fairly wide, deeply impressed beneath at sides of base; mentum deeply emarginate, with a long and slender tooth; palpi varies in form; labrum extraordinarily or well developed; mandibles dorsally covered by labrum or not covered; antennae stout and flat, densely pubescent from antennomere 5. Pronotum truncate-cordiform or quadrate, basal margin more or less produced backwards in middle; lateral margin with two setae, one just before middle, and the other at hind angle. Elytra with deep striae and setiferous pores; intervals slightly or rather convex, interval 8 usually wide and quite obsolete. Metepisterna elongate and very narrow in all species. Tarsomere 4 emarginate. Wings developed. No externally visible sexual dimorphic characters present. The median lobe of aedeagus varies in form. Parameres of aedeagus are quite similar, elon- gate, the left one larger than the right one. ZHAO D., T IAN M.: A review of the genus Macrocheilus HOPE 5 Habits No record about the life-history and habits of the members of Macrocheilus exists. ANDREWES (1920) noted that M. trimaculatus OLIVIER (= M. bensoni HOPE ) came to light and specimens had also been taken under stones and on grasses. All specimens in SCAU were collected at light traps. Key to species of Chinese Macrocheilus 1. Maxillary palpomere 4 not flattened dilated, lateral lobes of mentum round on outer margin, mandibles not exposed, lateral margin of labrum round, front margin of clypeus not or slightly emarginated in middle, elytron with one or two spots …………..……….. 2 - Maxillary palpomere 4 strongly and flattened dilated, lateral lobes of mentum sinuate behind middle or on anterior one-third, mandibles exposed, lateral margin of labrum dis- tinctly sinuate on anterior one-third, front margin of clypeus deeply and widely emargi- nate in middle, elytron with one spot ………………………….…………………….……7 2. Elytron with one spot, labrum with anterior setae on upper surface…………………..…. 3 - Elytron with two spots, labrum with anterior setae on apical margin or ventral surface…. 4 3. Elytral spot cruciform; labrum with basal margin almost parallel; ligula strongly dilated, apex narrow, apical margin almost straight; median tooth of mentum narrow..………..…. …………………………………………………………………………. M. asteriscus WHITE - Elytral spot almost round; labrum with basal margin widened towards middle; ligula not dilated, nearly rectangular, apical margin slightly rounded; median tooth of mentum triangular……………………………………………………………M. vitalisi ANDREWES 4. Maxillary palpomere strongly dilated; anterior setae of labrum on apical margin; ligula strongly thickened…………………………………………………………….…………... 5 - Maxillary palpomere 4 slightly or strongly dilated; anterior setae of labrum on ventral surface; ligula weakly thickened...…………………………………………………….…. 6 5. Body and elytral spots larger; labrum large and wide, with the intermediate setae at a short distance form margin, apex widely rounded; maxillary palpomere 4 entirely di- lated………………………………………………………….…........….. M. gigas sp. nov. - Body and elytral spots smaller; labrum small, with the intermediate setae close to margin, apex narrowly rounded; maxillary palpomere 4 strongly dilated on anterior half por- tion.…………………………………………………………... M. parvimaculatus sp. nov. 6. Maxillary palpomere 4 hardly dilated; pronotum with sides of basal margin weakly obliquely truncated; larger size……………………………………….…M. bensoni HOPE - Maxillary palpomere 4 strongly dilated; pronotum with sides of basal margin strongly obliquely truncated; smaller size………………………………... M. chaudoir ANDREWES 7. Elytral spots larger, nearly rectangular……………………….……….................…..…... 8 - Elytral spots smaller, not rectangular …………..............................................……...….. 10 6 Polish Journal of Entomology 79 (1) 8. Brown in color; labrum without additional setae apart from three pairs of labral setae, apex pointed rounded; mandibles obtuse at apices; median tooth of mentum with lateral margin not sinuate………...….…………….…………..............…M. fuscipennis sp. nov. - Black in color; labrum with a pair of additional setae apart from three pairs of labral se- tae, apex widely rounded; mandibles sharp at apices; median tooth of mentum with la- teral margin sinuate……………………...…………………………………..…..………... 9 9. Labrum with additional setae located between the anterior and intermediate setae; me- dian tooth of mentum with lateral margin sinuate in middle; mandibles less sharp at api- ces.....……………………………………………………………... M. solidipalpis sp. nov. - Labrum with additional setae located before the anterior setae; median tooth of mentum with lateral margin sinuate on anterior one-third; mandibles more sharp at apices……….. …………………………………………………………………….............. M. cheni sp. nov. 10. Labrum with anterior and intermediate setae located at a distance from each other, apex pointed rounded; mandibles sharp at apices; median tooth of mentum sharp at apex; pronotum almost quadrate…………………………………………. M. quadratus sp. nov. - Labrum with anterior and intermediate setae close to each other, apex widely rounded; mandibles obtuse at apices; median tooth of mentum strongly obtuse at apex; pronotum nearly cordiform………………….……………………………... M. sinuatilabris sp. nov. Macrocheilus asteriscus WHITE , 1844 (Figs 1, 12, 23, 30, 31, 50) Macrocheilus asteriscus WHITE , 1844: 422; BATES , 1892: 389; ANDREWES , 1919: 180; 1920: 500; 1924: 470; 1930: 206; CSIKI , 1932: 1573; WU, 1937: 188; JEDLI ČKA , 1963: 470; HŮRKA , 2003: 407; LORENZ , 2005: 512. Planetes crucifer REDTENBACHER , 1867: 4. Diagnosis Black; moderate sized; labrum (Fig. 1) parallel at sides, apex prominent, all three pairs of setae on upper surface; mandibles stout and obtuse at apex, not exposed; maxillary pal- pomere 4 (Fig. 23) almost more dilated in middle; ligula strongly thickened, lateral margin arcuate, apex narrowed and apical margin almost straight; mentum (Fig. 12) with one seta on each side close to tooth, median tooth very narrow; pronotum with sides of basal margin roundly truncate; elytron with a large cruciform spot. Median lobe of aedeagus (Figs 30, 31) elongated, hardly dilated, deeply sinuate