Osoriellus eggersi ( BERNHAUER, 1904 ) Irmler, 2014

Irmler, Ulrich, 2014, The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 64 (2), pp. 231-354 : 266

Osoriellus eggersi ( BERNHAUER, 1904) new combination ( Figs 62 A-C, 97C)

Osorius eggersi BERNHAUER, 1904: 19

Osorius laeviceps NOTMAN, 1925: 15 new synonymy

Type material examined: Saint Thomas: West Indies , (64°.45'W, 18°20'N) leg. Eggers (holotype of O. eggersi in FMNH) ; Puerto Rico: San Juan (66°06'W, 18°24'N) female, 1.- 5.7.1915, leg. Lutz and Mutchler (holotype of O. laeviceps in AMNH, # F 4003 d) .

Further material examined: Cuba: Prov. Pinar del Rio, Sierra del Rosario, El Mulo (83°20'W, 22°42'N), north. slope, T. caida, MNA, 400 m elevation, 1 female, 2 males, 1 female, 11.- 15.10.2007, leg. A. Lozada & A. Hdez ( IES) ; El Mulo , southern. slope, under bark, MSB, 200 m elevation, 1 female, 16.10.2007, leg. A. Lozada ( IES) ; El Solón (83°20'W, 22°42'N), SSB, bajo corteza, southern slope, 200 m elevation, 1 female, 242.1.2008, leg. A. Lozada ( IES) ; Artemisia, Cayajabos (82°51'W, 22°51'N), Sierra del Rosario , 2 females, 14.2.1932, leg. A. Bierig ( BMNH) ; Dominican Republic: Constanza, 7 miles W. Bonao, road to Constance (70°44'W, 18°53N), 5.8.1991, leg. L. Herman, collected in leaf litter near stream ( AMNH) ; Jarabacoa, 6.5 mi W, east slope below Hotel Montana , 27.06.1991, leg. L. Herman, collected litter near stream ( AMNH) ; San Francisco de Macoris, Loma de Quita Espuela (-70°14'W, 19°18'), 24.07.1991, leg. L. Herman, collected litter near stream ( AMNH) ; Haiti: Kenskoff (72°17.13'W, 18°27.2 N), Massif de la Selle, 1 specimen, 12.11.1934, leg. Darlington ( MCZ) ; Jamaica: Montego Bay (77°55', 18°27'N), sifted, 1 specimen, 10.03.1911, leg. Grossbeck ( AMNH) ; Mexico: San Luis Potosi , 12 km NW Naranjo, 400 m elevation, flight intercept trap, 5.7.1990, leg. J.S. Ashe, K.J. Ahn, R. Leschen ( KNHM) ; Jamaica , leg. Cameron, without further data ( BMNH) ; Nicaragua: Matagalpa, 6 km NW, Selva Negra, Fountain of Youth trail 1400 m elevation, flight intercept trap, 1 male, 22.5.2002, R.W. Brooks, Z. Falin, S. Chatzimanolis ( KNHM) .

Diagnosis: O. eggersi mostly resembles O. humicola in size and punctation of the pronotum. Without dissection of the aedeagus both species cannot be separated. In O. eggersi , the outer edge of the apical lobe of the aedeagus is sinuate ending in an acute apex, whereas in O. humicola it is evenly curved ending in an obtuse apex. O. eggersi also resembles O. carinicollis from the remaining-speciesgroup, but O. carinicollis has a distinctly digitate protibia, it is slightly smaller and the punctation of the pronotum is slightly finer. O. eggersi seems to be variable concerning the punctation of the pronotum and the number of sensillae on the apical lobe of the aedeagus. The specimens from Jamaica show a denser pronotal punctation than the specimens from Cuba, St. Thomas, and the Dominican Republic and only two instead of three apical sensillae.

Description: Length: 3.7 – 3.8 mm. Colouration: Brown; elytra slightly lighter; abdomen light brown; legs and antennae yellow.

Head: 0.55 mm long, 0.70 mm wide; fore-head slightly elongate; distance from eyes to front margin 1.5 times as long as temples; densely and distinctly punctate; interstices between setiferous punctures half as wide as diameter of punctures; small area on central clypeus and another area at base of antennae impunctate; seta pointing posteriorly; surface without microsculpture; polished and shiny.

Antennae with first antennomere as long as three following antennomeres; second antennomere oval and as long as conical third; antennomeres 4 to 6 small, approximately quadrate; antennomeres 7 to 10 distinctly thicker and wider than long.

Pronotum: 0.70 mm long, 0.75 mm wide; widest at anterior angles; evenly convergent to posterior angles; slight emargination in front of posterior angles; lateral margin fine; coarsely and densely punctate; interstices between setiferous punctures as on head, but punctures deeper; moderately wide midline impunctate; setae pointing posteriorly; between coarse punctation with sparse micro-punctation; surface without microsculpture, polished and shiny.

Elytra: 0.75 mm long, 0.75 mm wide; with coriaceous ground-sculpture and deep and dense setiferous punctation, punctures slightly visible in coarse groundsculpture; yellow setae pointing posteriorly; surface less shiny than on pronotum.

Abdomen with even denser setiferous punctation than on pronotum, but punctures finer; surface with weak netlike microsculpture; less shiny than on pronotum.

Protibia 0.44 mm long, 0.14 mm wide; with 9 long spines at outer edge; apical spines on short digits; WLR: 2.5; in posterior aspect, comb of inner emargination visible throughout its total length; posterior face densely covered by long yellow setae.

Aedeagus rectangularly angulate; upper edge of apical lobe sinuate ending in acute apex; inner edge of apical lobe with two groups of sensillae.

Figures

Fig. 58-62: Osoriellus-s. str.-group: Osoriellus levyi (58), O. loksai (59), O. bicolor (60), O. salvini (61), O. eggersi (62); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.