Osorius propinquus BERNHAUER

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 : 397-398

Osorius propinquus BERNHAUER ,, 1920: 138 (Figs 34 a-c)

Type material examined:

Brazil: Espirito Santo, 1 male (holotype, FMNH) .

Diagnosis:

The species resembles O. sahlbergi , O. nitens , O. puncticeps , and O. confusus in size and punctation. Microsculpture in O. propinquuspropinquus is much weaker than in O. sahlbergi , and surface is, thus, much shinier. Furthermore, the aedeagus of O. propinquuspropinquus ends in an obtuse hook-like apex, whereas aedeagus of O. sahlbergi is flattened at apex. It is most similar to O. nitens in the shape of the pronotum. In O. confususconfusus and O. puncticeps , the pronotum is more narrowed from anterior angles to posterior angles than in O. propinquus . It can be distinguished from O. nitens by the sparser and finer punctation of the pronotum.

Description:

Length: 10.5 mm. Colour: black.

Head :: 1.7 mm long, 2.3 mm wide; punctation deep and sparse; distance between punctures on average as wide as or distinctly wider than diameter of punctures; isodiametric microsculpture weak; surface shiny; disc at base of antennae impunctate and without microsculpture; surface polished; a transversal, oval space on posterior disc impunctate, but with weak microsculpture; clypeus with scarcely acute tooth-like lateral angles and central front emargination; labrum two times wider than long, not projecting front emargination; eyes 1/3 as long as temples; with few short postocular striae and several supraocular granular punctures and at least two supraocular setae.

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

Pronotum: 1.9 mm long, 2.4 mm wide; widest at tooth-like anterior angles; more or less continuously narrowed to posterior angles; lateral margin at anterior angles narrow; slightly wider at posterior edge; posterior edge margined; with sparse and moderately fine punctation; punctation on average finer and sparser than on head; distance between punctures on average two times wider than diameter of punctures; with very fine and sparse micro-punctation between normal punctures; isodiametric microsculpture weak; surface slightly shiny; with central indistinct longitudinal depression.

Elytra: 2.5 mm long, 2.4 mm wide; with deep and moderately dense punctation and weak coriaceous ground sculpture.

Aedeagus pear-shaped with short apical part ending in an obtuse slightly back-curved apex.