Hydrosmecta

Klimaszewski, Jan, Webster, Reginald P. & Davies, Anthony, 2017, Genus Hydrosmecta C. G. Thomson: a review of species occurring in eastern Canada (Coleoptera, Staphylinidae, Aleocharinae), Insecta Mundi 2017 (593), pp. 1-17 : 4

Key to Species of Hydrosmecta

1. Body length 1.5–1.6 mm; antennomeres VII–X moderately transverse ( Fig. 32 )............................. ....................................... H. minutissimoides Webster and Klimaszewski , new species

— Body length over 1.6 mm; antennomeres VII–X subquadrate to slightly or distinctly elongate ( Fig. 1 , 9 , 17 , 25 , 39 ) .......................................................................................................................... 2

2(1). Antennomere XI as long as two preceding antennomeres combined or slightly shorter ( Fig. 9 , 17 ); pronotum trapezoidal ( Fig. 9 , 17 ) ............................................................................................ 3

— Antennomere XI distinctly shorter than two preceding antennomeres combined ( Fig. 1 , 25 , 39 ); pronotum subrectangular ( Fig. 1 , 25 , 39 ) ................................................................................ 4

3(2). Body length 2.0– 2.1 mm; apical antennomere on average more elongate, at least two times as long as two preceding antennomeres combined ( Fig. 17 ); median lobe of aedeagus with basal projection of bulbus shorter, distinctly separated from tubus in lateral view ( Fig. 18 ); median part of tubus subparallel in dorsal view ( Fig. 19 ); spermathecal coils less tight ( Fig. 24 ) ................................. ............................. Hydrosmecta canadensis Webster and Klimaszewski , new species

— Body length 1.9–2.0 mm; apical antennomere on average less elongate, slightly less than two preceding antennomeres combined ( Fig. 9 ); median lobe of aedeagus with basal projection of bulbus slightly longer, narrowly separated from tubus in lateral view ( Fig. 10 ); median part of tubus strongly constricted in dorsal view ( Fig. 11 ); spermathecal coils tighter ( Fig. 16 )..... .................................................................................................... Hydrosmecta caduca Casey

4(2). Body broad ( Fig. 1 ); pronotum wider than length of elytra at suture, its lateral margins arcuate, microsculpture coarse, punctation moderately dense ( Fig. 1 ); median lobe of aedeagus and spermatheca as illustrated ( Fig. 2, 3, 8 ) ..................................................................................... ............................................................... Hydrosmecta borealis Klimaszewski and Langor

— Body narrow ( Fig. 25 , 39 ); pronotum about as wide as length of elytra at suture, its lateral margins subparallel, microsculpture fine, punctation dense ( Fig. 25 , 39 ); median lobe of aedeagus and spermatheca not as above ........................................................................................................ 5

5(4). Antennomeres VII–IX distinctly elongate ( Fig. 39 ); apical margin of female sternite VIII emarginate medially ( Fig. 45 ); spermatheca and median lobe of aedeagus as illustrated ( Fig. 40, 41, 46, 47 ) ................................................................................ Hydrosmecta pseudodiosica Lohse

— Antennomeres VII–IX moderately elongate ( Fig. 25 ); apical margin of female sternite VIII not emarginate medially ( Fig. 30 ); spermatheca and median lobe of aedeagus as illustrated ( Fig. 26, 31 ) ......................................................................................... Hydrosmecta dulcis Casey

Figures

Figures 32–38. Hydrosmecta minutissimoides Webster and Klimaszewski, sp. nov.32) Habitus in dorsal view.33) Median lobe of aedeagus in lateral view. 34) Male tergite VIII. 35) Male sternite VIII. 36) Female tergite VIII. 37) Female sternite VIII. 38) Spermatheca. Scale line for habitus = 1 mm, remaining scale bars = 0.2 mm.

Figures 1–8. Hydrosmecta borealis Klimaszewski and Langor.1) Habitus in dorsal view.2) Median lobe of aedeagus in lateral view. 3) Median lobe of aedeagus in dorsal view. 4) Male tergite VIII. 5) Male sternite VIII. 6) Female tergite VIII.7) Female sternite VIII.8) Spermatheca. Scale line for habitus = 1 mm, remaining scale bars = 0.2 mm.

Figures 9–16. Hydrosmecta caduca Casey. 9) Habitus in dorsal view.10) Median lobe of aedeagus in lateral view. 11) Median lobe of aedeagus in dorsal view. 12) Male tergite VIII. 13) Male sternite VIII. 14) Female tergite VIII. 15) Female sternite VIII. 16) Spermatheca. Scale line for habitus = 1 mm, remaining scale bars = 0.2 mm.

Figures 17–24. Hydrosmecta canadensis Webster and Klimaszewski, sp. nov. 17) Habitus in dorsal view. 18) Median lobe of aedeagus in lateral view. 19) Median lobe of aedeagus in dorsal view. 20) Male tergite VIII. 21) Male sternite VIII. 22) Female tergite VIII. 23) Female sternite VIII. 24) Spermatheca. Scale line for habitus = 1

Figures 25–31. Hydrosmecta dulcis Casey.25) Habitus in dorsal view.26) Median lobe of aedeagus in lateral view. 27) Male tergite VIII. 28) Male sternite VIII. 29) Female tergite VIII. 30) Female sternite VIII. 31) Spermatheca. Scale line for habitus = 1 mm, remaining scale bars = 0.2 mm.

Figures 39–47. Hydrosmecta pseudodiosica Lohse. 39) Habitus in dorsal view. 40) Median lobe of aedeagus in lateral view.41) Median lobe of aedeagus in dorsal view. 42) Male tergite VIII. 43) Male sternite VIII. 44) Female tergite VIII. 45) Female sternite VIII. 46–47) Spermatheca. Scale line for habitus = 1 mm, remaining scale bars = 0.2 mm.