Abstract
This paper studies the taxonomy of the genus Metolinus Cameron, 1920 (Coleoptera: Staphylinidae, Staphylininae, Xantholinini) from China and describes three new species: Metolinus xizangensis sp. n. from Xizang (Tibet), Metolinus emarginatus sp. n. fromSichuan, and Metolinus binarius sp. n. from Yunnan. The Chinese fauna of the genus is thus increased to 8 species in total. A key to eight Chinese species is provided. Female genital segments and other important morphological characters are illustrated in line drawings for the new species as well as Metolinus shanicus Bordoni, 2002 and Metolinus gardneri (Cameron, 1945). The text also provides color plates with habitus photographs and a map to show the species’ geographical distribution pattern. The type specimens of the new species are deposited in Institute of Zoology, the Chinese Academy of Sciences (IZ-CAS).
Highlights
The tribe Xantholinini is a large rove beetle group of more than 75 genera and was considered currently by most taxonomists as one of the six tribe level taxa in the subfamily Staphylininae (Coleoptera: Staphylinidae) (Newton et al 2000, Assing 2000, Herman 2001, Zhou 2005)
The genus Metolinus is one of those genus-level taxa belonging to the tribe Xantholinini
It was erected by Cameron (1920) and included originally two species: Metolinus basalis Cameron, 1920 and Metoponcus leucocnemis Kraatz, 1859
Summary
The tribe Xantholinini is a large rove beetle group of more than 75 genera and was considered currently by most taxonomists as one of the six tribe level taxa in the subfamily Staphylininae (Coleoptera: Staphylinidae) (Newton et al 2000, Assing 2000, Herman 2001, Zhou 2005). The genus Metolinus Cameron can be distinguished from all other genus level taxa within the tribe Xantholinini by the following characters: a) body nearly compressed, small to medium sized (3–8 mm), rarely larger (8–10 mm); b) head subquadrate or subrectangular (Fig. 2), often with microsculpture of microstriae (rarely of polygonal reticulum) and sparse medium punctures; c) frontal furrow often short or not obvious, ocular grooves distinct; d) penultimate segment of maxillary palpi and labial palpi distinctly longest, ultimate one slender and subaciculate (Fig. 3); e) pronotum with admedian and lateral row of punctures (Fig. 4); f ) antesternal plate integrated (Fig. 5); g) superior line of hypomeron bending towards the prosternum before anterior angle of pronotum, but not joining with inferior line; h) tibiae with apical ctenidium, only protibiae with 2–3 rows of subapical ctenidia; i) aedeagus subelliptical, or lenticular, with symmetrical and thin parameres (Fig. 9); j) female genital segment with large sternite, devoid of supplementary sclerites (Fig. 10H).
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