Coraebus bimaculatus, Wei & Xu & Shi, 2022

Wei, Zhonghua, Xu, Hongxia & Shi, Aimin, 2022, A new species of the genus Coraebus from China (Coleoptera: Buprestidae: Agrilinae), Zootaxa 5099 (1), pp. 146-150 : 147

Coraebus bimaculatus sp. nov.

( Figs. 1A–H )

Type material. Holotype: ♂, China, Guangxi, Jinxiu, Dayaoshan Mts. , 600–700 m, 18.IV.2021, Chunfu Feng leg., CWNU . Paratypes: 2♂ 2♀, same data as holotype, CWNU ; 4♂ 4♀, S. China, N. Guangdong, Nanling, 600–1400 m, 1–6. VI .2006, M. Takakuwa leg., COTJ, VKCB; 1♀, China, Hunan, Yizhang, Mangshan Mts. , Jiangjunzhai, 700 m, 31. V .2021, Zhonghua Wei leg., CWNU (in in 95% ethanol).

Other examined material. 1♀, Guangdong, Shaoguan, Nanling, Yuehuang Ecological Garden , 22.V. 2021, 566 m, Zhonghua Wei leg., CWNU (in 95% ethanol) ; 1♀, Guangxi, Jinxiu, Dayaoshan Mts. , 600–700 m, 18.IV.2021, Chunfu Feng leg., CWNU (in 95% ethanol) .

Male (Figs. A–B). Body length 11.0– 12.5 mm. Body elongate, cylindrical. Head, pronotum and scutellum golden with reddish tinge, elytra blue, ventral surface golden. Elytral surface with dense red-brown pubescence and two transverse spots, ventral surface with long yellow pubescence.

Labrum densely covered with long and yellow pubescence. Frontoclypeal keel distinct, straight, at the center of antennal grooves. Impression above frontoclypeal keel connected to supra-antennal grooves. Frons with deep longitudinal median impression. Supra-antennal grooves wide, open at outer side, carina above supra-antennal grooves connected in the middle, sinuate. Vertex with distinct longitudinal median line. Antennal grooves large with inner margin elevated and forming keel, outer margin open obliquely downwards. Sculpture of head formed by punctation and furrows, punctures well-separated. Antennae serrate from antennomere IV, antennomeres I–III subconical, antennomere I thickest, antennomere III–XI subequal in length and much shorter than antennomere II.

Pronotum widest just behind middle (at posterior 1/3, moderately tapering forwards, weakly backwards), approximately 1.6 times as wide as long; anterior margin slightly and arcuately produced in middle, posterior margin lobe-like produced towards scutellum and sinuate sidewards. Surface of prosternum and prosternal process ( Fig. 2A ) slightly impressed.

Scutellum strongly transverse, subcordate, 3.0 times as wide as long, surface smooth, with small punctures, impressed at middle.

Elytra approximately 2.5 times as long as wide, lateral margins in anterior 1/3 subparallel, gradually slightly arcuate widening to middle, then gradually narrowing to apex. Apex emarginate, lateroposterior margin with small serrations. Each elytron with one transverse spot composed of yellow pubescence.

Legs slender. Apical inner margin of mesotibia serrate behind middle ( Fig. 1E ). Apical inner margin of metatibia serrate, concaved before apex, and apex with a big flat spine ( Fig. 1F ).

Ventrites ( Fig. 2B ) with dense and long pubescence. Ventrite I with longitudinal impression at middle; ventrites I–IV with transverse impressions at lateral portion; posterior margin of ventrite V ( Fig. 2C ) concave, middle of impression with a distinctly produced spine.

Lateral sides of tegmen weakly concave before parameral membrane. Parameral membrane of tegmen well developed, with very short setae, parameres narrower than pallobase. Apex of phallus narrow and rounded.

Female ( Figs. 1C–D ). Body length 12.0– 13.5 mm. Elytral surface with four spots at posterior portion ( Fig. 1C ). Mesotibia and metatibia without serrations at apical inner margin. Inner apex of metatibia also without spines.

Diagnosis. This new species resembles Coraebus violaceipennis Saunders, 1866 (widely distributed in China, India, Kampuchea, Laos, Nepal, Thailand and Vietnam) by color pattern and body shape, however, can be easily distinguished from the latter by the elytral surface with two spots composed of yellow pubescence at apical portion in male (elytral surface with four spots in female), apex of metatibia with a big flat spine in male, ventrite V with distinctly concave posterior margin in male and female, and parameral membrane of tegmen with very short setae (that of C. violaceipennis with long setae, Fig. 2J ).

Etymology. The specific epithet refers to the male elytral surface with two pubescence spots.

Distribution. China: Guangxi, Guangdong, Hunan.

Figures

FIGURE 1. Coraebus bimaculatus sp. nov. A–B. habitus ♂, holotype, in dorsal and ventral views; C–D. habitus ♀, paratype, in dorsal and ventral views; E. mesotibia ♂, holotype; F. metatibia ♂, holotype, G–H. aedeagus, holotype, in dorsal and ventral views.

FIGURE 2. Morphology of Coraebus species. A–C. C. bimaculatus sp. nov., holotype.A. head and thorax, in ventral view; B. abdomen in ventral view; C. ventrite V; D–J. C. violaceipennis Saunders, 1866, male; D–E. habitus, in dorsal and ventral view; F. mesotibia; G. metatibia; H. prosternal process; I. ventrite V; J. aedeagus, in dorsal view.