Osorius confusus NOTMAN , 1925: 10

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 : 382

Osorius confusus NOTMAN, 1925: 10 (Figs 32 a-c, 38 H)

Type material examined:

Mexico: Omelaca (96°45' W, 18°43' N), 1 male 16.4.1908. leg. F. Knab (holotype, AMNH) .

Additional material examined:

Mexico: Puebla, Santa Lucia , 8 km SW Cuetzalan (97°31' W, 20°01' N) ( AMNH) , San Luis Potosi (91°37' W, 16°36' N), 4 specimens, 10 mi. E Xititla , 9.1.1952, leg. Creighton and 1 specimen, 24.11.1972, leg. J. Reddell ( AMNH, UIC) ; Castle Ingles, Xilitla , 1 specimen, 7.7.1990, leg. Danoff-Burg ( AMNH) ; Tlilipan , 2 specimens, 8.8.1967, leg. J. Reddell ( ANHM, UIC) .

Diagnosis:

The species is most similar to O. sahlbergisahlbergi in size, punctation and microsculpture of head and pronotum. The two species can only be distinctly differentiated by the shape of the aedeagus. Furthermore, in O. sahlbergisahlbergi microsculpture of the pronotum is generally isodiametric, while in O. confusus , sometimes a longitudinally reticulate microsculpture exists. Localities of both O. sahlbergisahlbergi and O. confusus are restricted to South Brazil and Mexico, respectively.

Description:

Length: 10.0 mm. Colour: black.

Head :: 1.40 mm long, 2.10 mm wide; eyes small, 1/3 as long as temples; front margin with obtuse lateral teeth and a smoothly curved central prominence; densely and distinctly punctate; distance between punctures on average as wide as diameter of punctures; with several granular supraocular punctures and striae; surface with distinct netlike microsculpture; slightly shiny.

AntennaeAntennae with 2 nd antennomere oval distinctly shorter than conical 3 rd one; antennomeres 4 to 6 longer than wide; subsequent ones more or less quadrate.

Pronotum: 1.85 mm long, 2.30 mm wide; widest at anterior edge; anterior angles tooth-like prominent; smoothly narrowed to posterior edge; in front of posterior angels slightly emarginate; lateral margin small at anterior angles and widened distad to posterior angels; midline deeply depressed beginning in anterior third and ending in front of posterior edge; surface with netlike or partly longitudinally reticulate microsculpture; slightly shiny.

Elytra: 2.10 mm long, 2.30 mm wide; with coriaceous ground sculpture and weak and sparse punctation.

Abdomen without dorsal punctation.

Front legslegs with 9 spines at outer edge; apical 4 ones on larger teeth; a row of approximately 10 hairs parallel to outer edge and a second row with few setae at inner side.

Aedeagus broad and nearly circular with short apical part; apical part extremely asymmetric pointing to left side; suddenly narrowed in front of acute apex.