Osorius dubius SHARP , 1887: 679

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 : 385-387

Osorius dubius SHARP, 1887: 679 ( Figs 27 a-c, 38 G)

Osorius laevigatus SHARP, 1887 , 679 new synonymy

Type material examined:

Panama: Volcan de Chiriqui, 25 – 4000 ft elevation, 1 male, 1 female, leg. Champion (syntypes, BMNH) ; Guatemala: Vera Paz, Sinanja , 1 male, leg. Champion (syntype of O. laevigatus, BMNH ) .

Additional material examined:

Belize: Olancho (86°42', 15 °06' N), under bark, La Muralla, 1450 m elevation, 1 specimen, 25.6.1994, leg. J.S. Ashe ( KU); Honduras: Yoro (87° 37', 15 °09' N), P.N. Pico Pijol, upper montane forest litter, 1300 m elevation, 2 specimens, 11.5.2002, leg. R. Anderson ( KU); Cortez (87° 58' W, 14° 55' N), Yojo Lake, Deer Island, flight intercept trap, 670 m elevation, 1 specimen, 26.6.1994, leg. J.S.Ashe ( KU); Santa Barbara, 11.5 km S; 5.6 km W. Peña Blanca (88 ° 02' W, 14° 57' N), beating stick pile, 1800 m elevation, 1 specimen, 20.06.1994, leg. R.W. Brooks ( KU); Costa Rica: Monteverde, Estacion Biologica, cloud forest litter, 4 specimens, 10.6.2001, leg. R. Anderson, 1 specimen, 12.5.1989, leg. J.S. Ashe ( KU, UIC); 1 specimen, SEM Costa Rica Exp., 1550 m elevation, 7 specimens, 12.5., 14.5., 15.5., 21.5., 22.5.1989, 2 specimens under bark, 12.5.1989, 1 specimen in small brown-spored gilled mushrooms at 1430 m elevation, 28.5.1989, leg. J.S. Ashe ( KU, UIC); cloud forest litter (84°47' W, 10 ° 18' N), 1800 m elevation, 1 specimen, 13.6.2001, leg. R. Anderson ( KU); Monteverde, lower montane forest litter, buried surface of decayed log, 1500 m elevation, 10 specimens, 11.2.1989, leg. D.A. Grimaldi ( AMNH, UIC); Monteverde, Cerro Amigos, leaf litter at base of tree, 1785 m elevation, 2 specimens, 22.5.1989, leg. J.S. Ashe ( KU); Campbell's woods, 1550 m elevation, 2 specimens, 9.5.1989, 11.5.1989, leg. J.S. Ashe ( KU); San José, km 45 Pan Am Hwy, 6 km NE El Empalme, forest litter, by Berlese, 1975 m elevation, 1 specimen, 8.6.1997, leg. R. Anderson ( KU); Pan American Hwy km 113, 23 km N San Isidro (83 °42' W, 9 °29' N), 2000 m elevation, 1 specimen by Berlese, 20.6.1997, leg. J.S. Ashe, ( KU); 2.4 km ENE Sn Gerardo de Rivas (83°33' W, 9°28' N), Cloudebridge Res. Ridge trail, under bark, 2100 m elevation, 2 specimens, 9.6.2004, 10.6.2004, leg. J.S. Ashe ( KU); Guanacaste, Conservation area, Patilla field St., cloud forest litter, 2 specimens, 14.2.1996, leg. R. Anderson ( KU); Santa Elena Cloud Forest Res. cloud forest litter (84°47' N, 10°20' N), 1650 m elevation, 3 specimens, 11.6.2001, leg. R. Anderson ( KU); Puntarenas, Las Alturas, Altamira Biol Stn. (82 ° 50' W, 8 ° 56' N), flight intercept trap, 1660 m elevation, 2 specimens, 3.6.2004, under bark, 1660 m elevation, 1 specimen, 1.6.2004, inside hepialid webs on trees, 1600 m elevation, 1 specimen, 6.6.2004, leg. J.S. Ashe ( KU); at: San Vito Biol. Stat., Las Alturas, 1500 m elevation, 1 specimen, 15.1.1992, leg. P. Hanson ( KU); Cerro Amigos, sifted leaf litter, 1780 m elevation, 1 specimen, 9.5.1989, leg. J.S. Ashe ( KU); San Ramón (84°28' W, 10°04' W), 27 km N & 8 km W, flight intercept trap, 15.6.1997, leg. J.S. Ashe ( KU); Alajuela, Rio Penas Blancas (84°28' W, 10 °04' N), flight intercept trap, 875 m elevation, 1 specimen, 19.5.1989, leg. J.S. Ashe ( KU); Cartago, Palo Alto Valley, 1500 m elevation, 8 km S Orosi (83 °51 ' W, 9 °43 ' N), 1 specimen, 25.5.1992, leg. M.E. Jameson ( KU); Orosi, 8 km S, Embalse, El Llano, flight intercept trap, 1500 m elevation, 1 specimen, 8.6.1992, leg. M.E. Jameson ( KU); Tuis 2 km NE, Rancho Naturalista (83 °33' W, 9 °49' N), 2500 m elevation, 1 specimen, 16.5.1995, leg. B. Ratcliffe ( KU); at: 9 km N Varablanca, El Angel Falls, 1 specimen, 9.7.1964, leg. G.C. Eickwort ( KU); Par. Nat.Tapanti, forest litter, Berlese, 1750 m elevation, 1 specimen, 4.6.1997, leg. R. Anderson ( KU); Santa Cruz de Turrialba, Rt 230, litter nr. stream, 1 specimen, 13.3.1991, leg. L. Herman ( AMNH); 15.5 km N Jct. Rts. 126(9) and 120, 12 km E RD to Virgen de Soccorro, Rio Sarpiqui, leaf litter from shore of Rio and banks, 750 m elevation, 1 specimen, 28.3.1991, leg. L. Herman ( AMNH); San Vito (82° 58' W, 9° 03' N), 35 km NE, nr. Las Alturas, Rio Bella Vista, wet leaf litter, 1300 m elevation, 2 specimens, 23.3.1991, leg. L. Herman ( AMNH); Panama: La Palma (84°15' W, 10°02' N), 1600 m elevation, 1 specimen, 9.1897, leg. Pittier ( BMNH); Bocas del Toro (82°14' W, 9°20' N), 2 km W, Fortunata; Hwy Continental divide, 1 specimen, 20.6.1995, 3 km W Fortunata Hwy, continental divide, 1050 m elevation, 1 specimen, 12.7.1995, leg. A.R Gillogly ( KU); Chiriqui, Palo Alto Valley 4 km E Boquete (82°23 ' W, 8°46 N), 1600 m elevation, 2 specimens, 11.08.1995, leg. A.R Gillogly ( KU); 3.5 km NE Santa Clara, Hartmann's Finca, Ojo (79°41 ' W, 9°03 N), 1450 m elevation, 2 specimens, 23.5.1995, leg. A.R Gillogly ( KU); Hornito (82°12' W, 8°39' N), Finca la Suiza, flight intercept trap, 1220 elevation, 2 specimens, 6.6.2000, 30.5.2000, leg. A. Howden ( KU); 6 km NE Boquete, under bark, 1500 m elevation, 1 specimen, 14.6.1996, leg. J.S. Ashe ( KU); La Fortuna (82° 12' W, 8 °46' N), Continental Divide Trail, under bark, 1080 m elevation, 2 specimens, 21.5.1995, leg. J.S. Ashe ( KU); 20 km N. Gualaca, Finca la Suiza, fungousy log, 1350 m elevation, 1 specimen, 22.5.1995, leg. J.S. Ashe ( KU).

Diagnosis:

The species resembles O. morio , O. piceuspiceus and O. continentaluscontinentalus in size and microsculpture of the pronotum. It can be distinguished from these species by the fine and sparse pronotal punctation and the deeper and narrower microsculpture with matter pronotal surface than in the three similar species.

Description:

Length: 9.0 mm. Colour: black; tarsi and antennae dark red.

Head :: 1.25 mm long, 1.75 mm wide; with eyes scarcely prominent; broad lateral prominence of clypeus undulate; punctation moderately fine and sparse; distance between punctures on average as wide as diameter of punctures; with granular supraocular punctures; on clypeus punctures with extremely short setae and a pair of longer setae; on disk without setiferous punctures; only one supraocular seta on each side behind posterior edge of eyes; laterad temples striate; surface with very weak isodiametric microsculpture; surface nearly polished.

AntennaeAntennae with 2 nd antennomere globular, not longer than wide; 3 rd antennomere conical, 1.5 times longer than 2 nd one; antennomeres 4 and 5 more or less quadrate, but distinctly smaller than quadrate subsequent antennomeres.

Pronotum: 1.50 mm long, 1.75 mm wide; widest at anterior angles; more or less strongly narrowed to posterior angles; scarcely emarginate in front of posterior angles; anterior angles with shortly tooth-like prominence; lateral margin small at anterior angles, widened to posterior angles; punctation fine and sparse; distance between punctures on average twice as wide as diameter of punctures; with small impunctate midline and short furrow in posterior half; surface with distinct isodiametric microsculpture; surface nearly shiny.

Elytra: 2.0 mm long, 1.75 mm wide; with deep coriaceous ground sculpture; surface dull; punctation scarcely visible.

Abdominal tergites with weak netlike microsculpture; punctation extremely fine and sparse except a transverse row of larger setiferous punctures along posterior edge of abdominal tergites.

Aedeagus broad, nearly circular with short apical part; apex obtuse and slightly curved.

Remarks:

SHARP (1887) already mentioned the strong similarity between O. dubiusdubius and O. laevigatus . The study of the syntypes of the two OsoriusOsorius species asserted the difference found by SHARP (1887). However, within a large collection of specimens, a high variety consists concerning the shape of the front edge of clypeus. As no differences were found in the aedeagus of O. dubius and O. laevigatus , the two species have been synonymised.

Figures

Fig. 27: O. dubius. - Fig. 28: O. morio. - Fig. 29: O. piceus (a: front body, b: antenna, c: aedeagus in ventral and lateral aspect; scale bar: a, b: 1 mm, c: 0.5 mm).