Osoriellus punctatellus n. sp. (Figs 47 A-C, 94E) Type material: Holotype, male: Ecuador: Cotopaxi, Tinalandia, Santo Domingo de los Colorados, 700 m elevation, collected at light, 18.5.1993, leg. J.J. Morrone (AMNH). Paratypes: Ecuador: with same data as for holotype, abdomen lost (UIC); Pichincha, Tinalandia (79°03'39W, 0°16'53S), 800 m elevation, 2 females, 2.11.1983, leg. L. Huggert (SMNH); Pichincha, Maquipucuna, 50 km NW Quito, banana, Berlese, female, 23.12.1991, leg. C.E. Carlton (KNHM); Maquipucuna, montane evergreen forest litter, male & female, 27.10.1999, leg. R. Anderson (KNHM); Peru: Madre de Dios, 15 km NE Puerto Cusco Amazonica, flight intercept trap, female, 17.06.1989, leg. R. Leschen (KNHM); Panama: Colon, Parque Nat. Soberania Pipeline Road (79°45'W, 9°07'N), flight intercept trap, female, 27.05.1995, leg. J. Jolly & C. Chaboo (KNHM); Colon, Parque Nat. Soberania, Pipeline Road (79°45'W, 9°07'N), from leaf litter, female, 29.05.1995, leg. J. Jolly & C. Chaboo (UIC); Colon, Parque Nat. Soberania, Pipeline Road km 5.3 (79°45'W, 9°07'N), 40 m elevation, collected by flight intercept trap, male, 31.5.- 2.6.1995, leg. J. Ashe & R. Brooks (KNHM). Diagnosis: The species strongly resembles O. indescriptus in size and both the shape and punctation of the pronotum. The colouration is darker than in O. indescriptus and the aedeagus has a more acute apex, whereas the adeagal apex of O. indescriptus is stout. The shape of the aedeagus is similar to that of O. exiguus, but the pronotal punctation of O. exiguus is distinctly sparser. Description: Length: 2.8. Colouration: Black; elytra dark brown with posterior margin black; anterior margin of clypeus yellow; legs and antennae yellow. Head: 0.45 mm long, 0.50 mm wide; with eyes not prominent; as long as temples; shape of fore-head trapezoidal; setiferous punctation dense and deep; on supraocular vertex still coarser; on lateral clypeus sparser and finer; wide midline impunctate; midline on clypeus wider than on posterior vertex; without microsculpture; surface of midline and clypeus polished and shiny. Antennae with second antennomere oval and slightly thicker than following 4 antennomeres; third antennomere conical; fourth antennomere quadrate; antennomeres 5 and 6 slightly wider than long, but not wider than preceding antennomeres; antennomeres 7 to 11 much wider than preceding antennomeres and wider than long; tenth antennomere nearly twice as wide as long. Pronotum: 0.50 mm long, 0.50 mm wide; widest at anterior angles; evenly convergent to posterior angles in smooth curve; in posterior third slightly more strongly convergent; lateral margin fine; in dorsal aspect, not visible in anterior half; setiferous punctation coarse, deep and dense; on average, interstices between punctures one-fourth as wide as diameter of punctures; with narrow impunctate midline; without microsculpture, but with sparse micro-punctation; surface polished and shiny. Elytra: 0.65 mm long, 0.55 mm wide; with deep and coarse setiferous punctation; with remains of microsculpture, but mainly polished and shiny. Abdomen deeply and densely punctate; narrow midline without setiferous punctures and shiny. Protibia: 0.30 mm long, 0.10 mm wide; nearly semicircular; 8 spine on outer edge; WLR: 2.50; in posterior aspect, comb of inner emargination totally visible; posterior face densely covered by setae. Aedeagus with long basal lobe; acute apical lobe nearly in rectangular angle to basal lobe. Etymology: The specific name refers to the densely and coarsely punctate pronotum.

Published as part of Irmler, Ulrich, 2014, The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae), pp. 231-354 in Beiträge Zur Entomologie = Contributions to Entomology 64 (2) on page 283, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706