A revision of the Nearctic species of the genus Stethusa Casey, 1910 (Coleoptera: Staphylinidae: Aleocharinae) Author Gusarov, Vladimir I. text Zootaxa 2003 239 1 43 journal article 51311 10.5281/zenodo.156493 c3fd5e49-3b05-4a99-9bc8-455ae3056faa 1175­5326 156493 Key to Nearctic species of Stethusa 1 Antennal article 11 with two subbasal impressions densely covered with microsetae ( Figs. 15­16 ). Internal sac of aedeagus with two strong distal spines ( Figs. 34­35, 37­ 38 ). Female with accessory sclerite ( Fig. 40 ). Distal end of spermatheca bent towards spermathecal gland ( Figs. 41­42 ). Body length 2.0­3.0 mm, pronotal length 0.41­0.53 mm . Widely distributed in the eastern United States ( Fig. 110 ). Also known from Bolivia , Paraguay , the Galápagos Islands and the Antilles..1. S. dichroa (Gravenhorst) – Antennal article 11 without subbasal impressions, microsetae evenly distributed. Internal sac of aedeagus without strong distal spines ( Figs. 53­54 , 67­68 ). Female without accessory sclerite. Distal end of spermatheca bent away from spermathecal gland ( Figs. 57 , 70 ) ....................................................................................................... 2 2 Body larger, length 3.2­3.5 mm , pronotal length 0.54­0.61 mm . Apex of median lobe in lateral view straight ( Figs. 50­51 ). Spermatheca longer ( Fig. 57 ). Known from Louisiana, Mississippi and southern Indiana ( Fig. 111 )........ 2. S. klimschi (Bernhauer) – Body smaller, length 2.1­2.5 mm , pronotal length 0.36­0.44 mm . Apex of median lobe in lateral view bent paramerally ( Figs. 65­66 ). Spermatheca shorter ( Fig. 70 ). Widely distributed in the eastern United States ( Fig. 111 ).......... 3. S. spuriella (Casey)