A revision of the Nearctic species of the genus Stethusa Casey, 1910 (Coleoptera: Staphylinidae: Aleocharinae)
FIGURES 22 ­ 28. Abdominal segment 8 of Stethusa dichroa (Gravenhorst) (18 km SSE Lawrence, Kansas (22 ­ 23, 25); 12 km NNE Lawrence (24, 27); 2 km N Eddyville, Illinois (26, 28 )). 22 – male tergum 8; 23 – male sternum 8; 24 ­ 26 – apex of male tergum 8; 27 – female tergum 8; 28 – female sternum 8. Scale bar 0.2 mm (22 ­ 23, 27 ­ 28), 0.1 mm (24 ­ 26).
FIGURES 34 ­ 39. Aedeagus of Stethusa dichroa (Gravenhorst) (males, 12 km NNE Lawrence, Kansas (35 ­ 36, 38 ­ 39); 18 km SSE Lawrence (34, 37 )). 34 – everted internal sac, parameral view; 35 ­ 36 – details of retracted internal sac, abparameral view; 37 – everted internal sac, lateral view; 38 ­ 39 – details of retracted internal sac, lateral view. SB ­ sclerotized band. Scale bar 0.2 mm.
FIGURES 40 ­ 42. Details of Stethusa dichroa (Gravenhorst) (female, 12 km NNE Lawrence, Kansas). 40 – female abdominal segments 9 ­ 10, ventral view; 41 ­ 42 – spermatheca of the same specimen illustrated at different angles. The arrow indicates the point where the spermathecal gland is attached. Scale bar 0.2 mm (40), 0.1 mm (41 ­ 42).
FIGURES 43 ­ 47. Abdominal segment 8 of Stethusa klimschi (Bernhauer) (male (43 ­ 45) and female (46 ­ 47) 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 (43 ­ 44, 46 ­ 47), 0.2 mm (45).
FIGURES 14 ­ 17. Details of Stethusa dichroa (Gravenhorst) (male (14 ­ 16) and female (17), Eddyville, Illinois). 14 – right mesotibia; 15 – antennal article 11; 16 – right antenna; 17 – right metatarsus. Scale bar 0.1 mm (15, 17), 0.2 mm (14), 0.4 mm (16).
FIGURE 110. Geographical distribution of Stethusa dichroa (Gravenhorst) in North America. The exact localities in Vermont and Maine are unknown.