New species and synonymies in Xenopygus Bernhauer (Coleoptera: Staphylinidae: Staphylinini) Author Chatzimanolis, Stylianos Author Caron, Edilson text Zootaxa 2016 4200 1 131 142 journal article 37753 10.11646/zootaxa.4200.1.5 19137a58-09d1-4bfd-b42f-da50c723ce01 1175-5326 177837 2BBBAB3F-45A7-4C03-B161-EBCF480C0660 Xenopygus Bernhauer Xenopygus Bernhauer, 1906: 196 [species included: X. analis (Erichson, 1840) , X. bicolor (Laporte, 1835) ]; full taxonomic history in Caron et al. 2016 . Leptodiastemus Bernhauer, 1934 : 215 [described as subgenus of Dysanellus , species included: Dysanellus ( L. ) excellens Bernhauer, 1934 ]; type species Dysanellus ( L. ) excellens Bernhauer, 1934 ; fixed by monotypy. New synonymy. Type species: Xenopygus analis (Erichson, 1840) ; Blackwelder 1943 : 451. Diagnosis. Xenopygus can be distinguished from all other Xanthopygina based on the combination of the following characters: antennomeres 6–10 transverse (in contrast to several species of superficially similar Oligotergus that have antennomeres 6–10 subquadrate or longer than wide); labial palpomere 3 truncate and not securiform; head narrow (much wider in the related genus Xanthopygus ); nuchal ridge developed (absent in some Xanthopygina genera); neck with punctures and micropunctures (punctation absent in most Xanthopygina genera); postcoxal process present (absent in Oligotergus ); abdominal terga III–IV or III–V with arch-like carina (absent in some closely related Xanthopygina genera).