Osorius piceus ERICHSON, 1840: 755

Irmler, Ulrich, 2010, The Neotropical species of the genus Osorius G - M, 1829 with remarks to the Neotropical Osoriid complex (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 60 (2), pp. 363-426 : 396-397

Osorius piceus ERICHSON, 1840: 755 (Figs 29 a-c)

Type material examined:

Brazil: 1 male, 1 female without further data (syntypes, ZMHU) .

Additional material examined:

Brazil: 1 specimen, without further data ( BMNH); Est. do Rio de Janeiro, Petropolis (43°10' W, 22°31' S) , 1 male, 10.9.1961, leg. Schubart ( UIC); Rio de Janeiro (43°14' W, 22°49' S) , 2 specimens without further date, leg. Squires ( BMNH); Corupa (49°13' W, 26°26' S) , Hansa Humboldt , 2 specimens, Nov. 1940 and Nov. 1948, leg. A. Maller ( AMNH); Santos (46°18' W, 23°57' S) , Ilha Santo Amaro , 1 specimen, 3.4.1916, leg. G. Bryant ( BMNH); Paraná, Antonina, 11.8 km NE, Res. Nat. do Rio Cachoeira, Sec. moist lowland forest, sift litter (48°42' W, 25°19' S) , 1 specimen, 15.8.2003, leg. J. Bihn ( CC); Guaraquecaba (48°19' W, 25°17' S) , Reserva Serra do Itaqui, moist lowland forest, sift litter, Winkler sample , 3 specimens, 21.5.2007 and 9.9.2007, leg. P. Hopp ( CC, UIC); São Paulo (46°36' W, 23°41' S) , 1 specimen without further data ( AMNH) .

Diagnosis:

The species can be differentiated from the similar species in size by the lighter coloured brown elytra when comparing it to the black elytra in all other species.

Description:

Length: 8.7 mm. Colour: black; pronotum and elytra dark brown.

Head :: 1.5 mm long, 1.8 mm wide; with dense and deep punctation; distance between punctures on average as wide as diameter of punctures; isodiametric microsculpture moderately deep; surface shiny; front edge of clypeus emarginate with undulate inner side of lateral teeth; with one long and several extremely short setae on each side of middle; labrum wider than long; lateral striae behind eyes short and weak; with several supraocular granular punctures.

AntennaeAntennae with 2 nd antennomere oblong; 3 rd conical antennomere scarcely longer than 2 nd; antennomeres 4 to 6 slightly longer than wide; subsequent antennomeres quadrate.

Pronotum: 1.7 mm long, 2.0 mm wide; sides widest at front angles, forming a short prominent tooth; more or less continuously narrowed to posterior angles; posterior edge margined; with punctation and microsculpture as on head; surface shiny; a fine and sparse micro-punctation between normal, coarse punctures.

Elytra: 2.2 mm long, 2.0 mm wide; with weak coriaceous ground sculpture, and sparse and fine punctation; surface shiny, nearly polished.

AedeagusAedeagus small and elongate with a short acute apical part.