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 Stethusa klimschi ( Bernhauer, 1909 ) ( Figs. 21 , 43­57 ) Atheta ( s. str. ) klimschi Bernhauer, 1909 : 523 . Atheta ( Stethusa ) klimschi : Casey, 1910 : 5 (as valid species). Atheta sulcata Blatchley, 1910 : 355 . Atheta ( Hypatheta ) klimschi : Fenyes, 1920 : 207 (as valid species). Atheta sulcata : Fenyes, 1920 : 227 (as valid species of doubtful systematic position). Atheta ( Hypatheta ) klimschi : Bernhauer & Scheerpeltz, 1926 : 653 (as valid species). Atheta ( Earota ) sulcata : Bernhauer & Scheerpeltz, 1926 : 655 (as valid species). Atheta ( Stethusa ) klimschi : Moore & Legner, 1975 : 364 (as valid species). Atheta ( Earota ) sulcata : Moore & Legner, 1975 : 375 (as valid species). Stethusa klimschi : Seevers, 1978 : 267 (as valid species). Earota sulcata : Seevers, 1978 : 271 (as valid species). Atheta klimschi : Gusarov, 2002b : 14 (as valid species). Atheta sulcata : Gusarov, 2002b : 14 (as synonym of At. klimschi ). FIGURES 43­47. Abdominal segment 8 of Stethusa klimschi (Bernhauer) (male (43­45) and female (46­47) from Vicksburg, Mississippi). 43 – male tergum 8; 44 – male sternum 8; 45 – apex of male tergum 8; 46 – female tergum 8; 47 – female sternum 8. Scale bar 0.4 mm (43­44, 46­47), 0.2 mm (45). Type material. Lectotype of Atheta klimschi (designated by Gusarov (2002b)) , UNITED STATES : Louisiana: St. Landry Parish: ɗ, Opelousas, vi; paralectotype of Atheta klimschi , UNITED STATES : Louisiana: ɗ, Opelousas, vi ( FMNH ). Lectotype of Atheta sulcata (designated by Gusarov (2002b)) , UNITED STATES : Indiana: Posey Co.: ɗ, 22.iv.1909 ( PURC ). Additional material. United States : Louisiana: St. Landry Parish: 2ɗɗ, Opelousas, v (Klimsch) ( FMNH ); Mississippi: Warren Co.: 2ɗɗ, 3ΨΨ, "·Miss." [Vicksburg (according to Casey locality Code (FitzGerald 1962)) ] ( NMNH (Casey collection)). Diagnosis. Stethusa klimschi differs from S. dichroa in the following characters: the lack of subbasal impressions of the terminal antennal article; the apex of median lobe is narrower in ventral view ( Figs. 48­49 ; 29­30) and straight in lateral view ( Figs. 50­51 ; 31­ 32); the lack of the distal spines of the internal sac ( Figs. 54 ; 38­39); the shape of the spermatheca ( Figs. 57 ; 41­42); and the lack of a female accessory sclerite. FIGURES 48­52. Aedeagus of Stethusa klimschi (Bernhauer) (lectotype (48­51); and male from Vicksburg, Mississippi (52)). 48 – median lobe, parameral view; 49 – apex of median lobe, parameral view; 50 – median lobe, lateral view; 51 – apex of median lobe, lateral view; 52 – apex of left paramere. Scale bar 0.1 mm (49, 51­52), 0.2 mm (48, 50). Stethusa klimschi differs from S. spuriella in having a larger body size; straight apex of the median lobe (in lateral view; Figs. 50­51 ; 65­66); and a longer spermatheca ( Figs. 57 ; 70). Description . Length 3.2­3.5 mm . Head dark brown, pronotum and abdomen reddish brown to brown, segments 5­6 darker than the rest of the abdomen; elytra brownish yellow with darker area around scutellum and epipleura, legs brownish yellow, mouthparts and antennae brown, two basal antennal segments yellowish. FIGURES 53­57. Aedeagus and spermatheca of Stethusa klimschi (Bernhauer) (lectotype (53­54); male (55­56) and female (57) from Vicksburg, Mississippi). 53 – details of retracted internal sac, abparameral view; 54 – details of retracted internal sac, lateral view; 55 – copulatory piece, lateral view; 56 – copulatory piece, abparameral view; 57 – spermatheca. Scale bar 0.2 mm (53­54), 0.1 mm (55­57). Head surface glossy, with weak isodiametric microsculpture, with fine punctation, distance between punctures equals 2 times their diameter. Eyes very large, 3.5­5 times as long as temples. Antennal article 2 is 1.1 times as long as article 3, articles 4­6 subquadrate, 7­10 slightly transverse, article 11 as long as articles 9 and 10 combined. Pronotum transverse, 1.3 times as wide as head, width 0.69­0.77 mm , length 0.54­0.61 mm , width to length ratio 1.3; glossy, with weak isodiametric microsculpture; punctation as fine as on head but denser, distance between punctures equal to 1­2 times their diameter. Elytra much wider ( 0.86­0.96 mm ) and longer ( 0.67­0.74 mm ; measured from humeral angle) than pronotum (elytral length to pronotal length ratio 1.2), 1.3 times wider than long, surface glossy, with poorly visible microsculpture; punctation fine and slightly asperate, distance between punctures equals 1­2 times their diameter. Abdominal terga glossy, with weak microsculpture consisting of transverse waves; with fine punctation, distance between punctures equals 1­3 times their diameter on terga 3­5 and 3­6 times on terga 6­7. Apical margin of tergum 7 with white palisade fringe. Male tergum 7 with elongate medial tubercle in front of posterior margin. Posterior margin of male tergum 8 with two blunt medial projections and two lateral denticles ( Figs. 43, 45 ). Aedeagus as in Figs. 48­56 , internal sac without distal spines ( Fig. 54 ). Female without accessory sclerite. Spermatheca as in Fig. 57 . Discussion. In my earlier paper ( Gusarov 2002b ) I argued that S. klimschi did not belong to Earota because of the narrower mesosternal process, and tentatively placed this species in Atheta . Although in S. klimschi the mesosternal process is indeed narrower than in Earota it is still broader than in Atheta . Stethusa klimschi can be distinguished from Atheta based on additional characters listed in the diagnosis of Stethusa . Distribution. Stethusa klimschi is known from Louisiana, Mississippi and southern Indiana ( Fig. 111 ). Natural History. No information is available.