The Neotropical species of the genera Pseudespeson L, 1994 and Espeson S, 1882 (Coleoptera: Staphylinidae: Osoriinae) Author Irmler, U. text Beiträge Zur Entomologie = Contributions to Entomology 2012 2012-12-20 62 2 331 360 journal article 6439 10.21248/contrib.entomol.62.2.331-360 4e2d6f56-fddc-4e28-bfd5-065db656475d 0005-805X 4812872 Espeson microphthalmus FAUVEL , 1902: 36 ( Figs 5a,b , 16E ) Type material examined: French Guyana : 1 female , without further data ( holotype , IRSNB ) Diagnosis: Compared to the other yellow species, E. microphthalmus can be differentiated by the overall parallel shape of the body that resembles a species of the genus Pseudespeson ; but abdominal segment III is slightly narrowed and tergite VIII is without central spine. The pronotal emargination is deep and its sides are nearly parallel with a distinct lateral margin, whereas they are concave in the other yellow Espeson species and lateral margins are absent or extremely narrow. A dorsal impression is absent as in E. adisi , but in E. adisi the shape of the pronotal emargination is concave and abdominal segment III and IV are narrowed at base. Unfortunately, only the type female is known. Description: Length : 1.9 mm . Colour : yellow, antennae and legs lighter yellow. Head : 0.25 mm long, 0.30 mm wide; eyes as large as temples; temples smoothly rounded; punctation dense and deep; distance between punctures half as wide as diameter of punctures; without microsculpture; surface polished. Antennae shorter than head and pronotum combined; 2 nd globular, 3 rd conical, both antennomeres equal in length; following 3 antennomeres at least slightly wider than long and not wider than preceding antennomeres; antennomeres 7 to 11 distinctly wider than preceding ones and distinctly wider than long; 8 th antennomere slightly smaller than preceding and following antennomere and three times wider than long; penultimate antennomeres twice as wide as long. Pronotum : 0.28 mm long, 0.38 mm wide; distinctly emarginate in front of posterior edge; with deep impression in the emargination; widest in the middle and slightly narrowed to the anterior angles; deeply and densely punctate on the disc, punctation partly coriaceous; without microsculpture; surface polished. Elytra : 0.45 mm long, 0.43 mm wide; punctation irregularly dense; distance between punctures as wide as or smaller than diameter of punctures; without microsculpture; surface polished. Abdomen with similar punctation as on elytra and weak microsculpture; surface shiny, but less shiny than elytra; tergite of last abdominal segment rounded.