Pachycorynus helvus, Bordoni, 2013

Bordoni, A., 2013, New data on the Xantholinini from China. 24. New genus, new species and new records of the Shanghai Normal University collection (Coleoptera, Staphylinidae) 244 ° contribution to the knowledge of the Staphylinidae, Linzer biologische Beiträge 45 (2), pp. 1745-1797 : 1746-1747

Pachycorynus helvus nov.sp.

M a t e r i a l s t u d i e d: Holotype: Jiangxi, Jinggangshan City, Ciping Town , 850 m, Peng, Zhai & Zhu 22.X.2010 ( SNUC); paratypes: same data, 1, 2 ( SNUC), 1, 1 (cB).

D e s c r i p t i o n: Length of body about 2,9 mm; from anterior margin of head to posterior margin of elytra: 1,4 mm. Very small and flat species, entirely yellowish. Head sub-rectangular, a little narrow anteriorly, with slightly rounded sides and strictly rounded posterior angles. Eyes small and protruding. Surface of head without lateral grooves, with polygonal micro-reticulation and deep puncturation, apart a median strip. Pronotum narrow, narrower and longer than head, with oblique anterior margins. Surface with traces of more or less transverse micro-striature and puncturation composed by numerous punctures to the sides of a median strip. Elytra very long, longer and wider than pronotum, with rounded humeral angles. Surface rough, with numerous punctures, arranged in more series. Abdomen with transverse micro-striation and fine, sparse puncturation.

Tergite and sternite of the male genital segment as in Figs 1-2 . Aedeagus ( Fig. 3 ) very

small, 0,74 mm long, membranous, with short, sub-rectangular distal portion and short and very narrow parameres.

E t y m o l o g y: The specific epithet refers to the Latin helvus- a- um (yellowish).

G e o g r a p h i c a l d i s t r i b u t i o n: The species is known only from the type locality, in Jiangxi.

N o t e: For the external characters this species is closely related to P. fragilis (CAMERON 1932) from Thailand and Malaysia.

Figures

Figs 1-7: tergite, sternite of the male genital segment, aedeagus of Pachycorynus helvus nov.sp. (1- 3) (bar scale: 0,1 mm); head and pronoum (bar scale: 1 mm), labrum, tergite, sternite of the male genital segment of Thyreocephalus macrophallus nov.sp. (4-7).