The Neotropical species of the genus Osorius G - M, 1829 with remarks to the Neotropical Osoriid complex (Coleoptera: Staphylinidae: Osoriinae) Author Irmler, Ulrich text Beiträge Zur Entomologie = Contributions to Entomology 2010 2010-12-20 60 2 363 426 https://www.contributions-to-entomology.org/article/view/1782 journal article 10.21248/contrib.entomol.60.2.363-426 0005-805X 5212736 Osorius morio NOTMAN , 1925: 18 (Figs 28 a-c) Type material examined: Mexico : Veracruz , Omealca ( 96°45' W , 18°43' N ), 1 male , April 16, 1908 , leg. F. Knab ( holotype , NHMW ) . Additional material examined: Mexico : Pipiapan ( 95°03' W , 18°27' N ), carrion trap , 1 specimen , 15.2.1991 , leg. Morón ( KU ) ; 4 km W Sontecompan ( 95°59' W , 18°30' N ), 1 specimen , 10.4.1966 , leg. G.E. Ball ( KU ) ; Cordoba ( 96°55' W , 18°53' N ), 1 specimen , 12.6.1908 ( AMNH ) ; Oaxaca , Palenque ( 91°58'W , 17°29'N ), under bark, 200 m elevation, 4 specimens , 24.4.1993 , leg. R.W. Brooks ( KU , UIC ) ; Jalapa ( 92°48' W , 17°42' N ), 9 specimens without date, leg. W. Schaus ( AMNH ) ; Veracruz ( 96°16 W , 19°11 N ), Las Cabanas , Monte Pio Veracruz , 19.1.1980 , leg. Espinoza ( UNAM ) . Diagnosis: O. morio is a medium-sized species without micro-punctation, but with dense microsculpture and matte surface. In this respect, it resembles a large number of species from which it can be hardly distinguished. Certain identification can be achieved only by a genital dissection. The apical part of the aedeagus is extremely long compared to the basal part. It ends in a thick, obtuse apex that is lighter in colour in comparison to the remaining aedeagus. Description: Length : 9.5 mm . Colour : black; legs and antennae dark brown. Head :: 1.4 mm long, 2.0 mm wide; eyes small; shorter than temples; anterior half distinctly narrowed to front edge; anterior edge of clypeus undulate and with pair of broad teeth; in centre smoothly prominent; punctation dense and distinct; only at base of antennae impunctate; distance between punctures on average shorter than diameter of punctures; with several supraocular granular and setiferous punctures; with several short striae behind eyes; surface with weak isodiametric microsculpture, shiny; in addition to supraocular setiferous punctures, a pair of setae on disc at anterior edge of eyes, near neck, and at posterior edge of clypeus. AntennaeAntennae with 2 nd antennomere oval; conical 3 rd 1.5 times longer than 2 nd ; antennomeres 4 and 5 slightly longer than wide; subsequent antennomeres increasing in length, but more or less quadrate. Pronotum : 1.5 mm long, 2.1 mm wide; widest at anterior edge; anterior angles tooth-like prominent; sides in anterior half slightly narrowed, in posterior half strongly narrowed; slightly emarginate in front of posterior angles; lateral margin narrow shortly behind anterior tooth; distad widened and widest in front of posterior angles; punctation less dense than on head; distance between punctures on average as wide as or wider than diameter of punctures; a small impunctate midline with a short groove in posterior half; surface with weak netlike microsculpture, more distinct than on head and, thus, less shiny. Elytra : 2.0 mm long, 2.0 mm wide; with coarse punctation; punctures distinctly larger than on pronotum; with weak coriaceous ground sculpture, and longitudinally striate in anterior half; surface shiny. AedeagusAedeagus nearly triangular in shape with thick and long apical part ending in a thick obtuse apex which is lighter in colour than remaining aedeagus.