Osorius stipes SHARP , 1876: 3

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 : 402

Osorius stipes SHARP, 1876: 3 82 (Figs 2 a-c)

Type material examined:

Brazil: Amazonas : Téfé 1 male (syntype, BMNH) .

Additional material examined:

Brazil: Tefé , 3 specimens leg. M. de Mathan, 1. Trimestre 1879 ( BMNH) ; Manaus, Reserva Ducke , 14.3.1971 and 9.6.1971, leg. U. Irmler, collected under bark ( UIC) , 26.7.1973, leg. R.T. Schuh ( AMNH) ; Ilha Itacoai , 1 specimen, 6.1950, leg. J.C.M. Carvalho ( UIC) ; Manaus , Nov. 1961. leg. R. Arlé ( UIC) ; Benjamin Constante (70°02' W, 4°22' S), Rio Javary , 1 specimen, 15.3.1942. leg. A. Rabaut ( AMNH) ; Cearà; Pebas (71°49' W, 3°10' S), 1 specimen ( IRSNB) ; Pará , 1 male, 1 female, without further data ( BMNH) ; Jacareacanga (57°38' W, 6°16' S), 1 specimen, 15.4.1969, leg. R. Barbosa ( AMNH) ; Marituba, Ananindeua (48° 22' W, 1° 22' S), 1 specimen, 15.11.1963, leg. Wygodzinski ( AMNH) ; Mato Grosso: May 1947, leg. J.C.M. Carvalho ( UIC) ; French Guiana: Saül, Les Eaux Clairs , fig fruit fall, 1 specimen, 13.10.1995, leg. L. Herman ( AMNH) ; Guyana: Kartabo (57°37' W, 5°47' N), 16.8.1922, leg. W. Beebe ( AMNH) ; Peru: Iquitos (73°11' W, 3°45' S), lowland forest, Rio Napo, Rio Sucusari , 1 specimen, 12.1998, leg. M.V. Bracley ( BMNH) ; 1 specimen without further data ( IRSNB) .

Diagnosis:

The species can be distinguished from similarly sized species by the deep, long and numerous supraocular striae. In contrast to the remarks given by SHARP (1876), size is variable and not differing from the related species. It can not be distinguished from O. alternansalternans without study of the aedeagus. The aedeagus in O. stipesstipes is long with an acute apex, whereas the aedeagus in O. alternansalternans is shorter and the apex is obtuse and shortly curved.

Description:

Length: 12 – 17 mm. Colour: black.

Head :: 3 mm long, 3.8 mm wide; distinct and moderately sparse punctation; distance between punctures slightly wider than diameter of punctures; netlike reticulate microsculpture distinct; surface dull; anterior edge of clypeus distinctly denticulate; laterad with dense granular punctation; with several longitudinal supraocular and postocular striae behind eyes; disc with a pair of indistinct circular depressions; in lateral aspect, in front of eyes with three granular setiferous punctures; supraocular space with many granular setiferous punctures.

Antennae: with 3 rd antennomere slightly longer than 2 nd; antennomeres 4 to 6 more or less quadrate; subsequent antennomeres slightly wider than long.

Pronotum: 2.8 mm long, 3.9 mm wide; distinct, but moderately dense punctation; distance between punctures on average two times wider than diameter; anterior angle denticulate and prominent; isodiametric microsculpture distinct; surface dull.

Elytra: 3.7 mm long, 3.9 mm wide; with numerous, coriaceous, longitudinal striae.

Aedeagus pear-shaped with a moderately long apical part ending in an acute apex.