Hydnobius, Schmidt, 1841

Peck, Stewart B. & Cook, Joyce, 2009, Review of the Sogdini of North and Central America (Coleoptera: Leiodidae: Leiodinae) with descriptions of fourteen new species and three new genera, Zootaxa 2102 (1), pp. 1-74 : 12-13

Key to North American species of Hydnobius (males)

1 Parameres narrow in apical one-half, straight ( Figs. 18 , 40 ) ...................................................................................... 2

- Parameres not as above, broad, sinuate, or curved ( Figs. 25 , 33 , 48 )......................................................................... 3

2 Median lobe of aedeagus gradually narrowing to acute apex ( Fig. 18 ); internal sac with two elongate rows of dark setae ( Fig. 18 ), setae also visible posteriorly when internal sac is inverted; antennomere 7 clearly broader than antennomere 8 ( Fig. 15 ) .................................................................................................................................. H. substriatus

- Median lobe of aedeagus abruptly narrowing to acute apex ( Fig. 40 ); internal sac densely covered with small scalelike setae ( Fig. 40 ); antennomere 7 narrow, hardly broader than antennomere 8 ( Fig. 37 )......................... H. laticeps

3 Parameres broad or sinuate ( Figs. 25 , 33 , 59 ); transcontinental or eastern species..................................................... 4

- Parameres narrow and outwardly curved ( Figs. 48 , 54 ); western species .................................................................. 6

4 Parameres broad, with apical one-half concave medially ( Fig. 25 ); small body size, length of pronotum + elytra less than 2.2 mm ................................................................................................................................................ H. pumilus

- Parameres not as above, larger body size, length of pronotum + elytra greater than 2.2 mm..................................... 5

5 Parameres sinuate ( Fig. 33 ); internal sac with a pair of sclerotized oblong lobes ( Fig. 33 ), lobes may be visible also when internal sac is inverted; male protibial spur broad ( Fig. 31 ) ........................................................... H. longidens

- Parameres straight ( Fig. 59 ); internal sac does not contain sclerotized lobes; male protibial spur unmodified............. ............................................................................................................................................................... H. autumnalis

6 Mesoventrite with median carina..................................................................................................................... H. kiseri

- Mesoventrite without median carina.......................................................................................................... H. acarinus

Figures

FIGURES 15–20. Hydnobius substriatus. 15. Right antenna, dorsal view. 16. Mandibles, dorsal view. 17. Male right metafemur. 18. Aedeagus, dorsal view. 19. Female coxites and styli, ventral view. 20. Female sternite 8, ventral view. Scale bar = 0.3 mm (Fig. 19), 0.4 mm (Figs. 15, 16, 18, 20), 0.5 mm (Fig. 17).

FIGURES 37–42. Hydnobius laticeps. 37. Right antenna, dorsal view. 38. Mandibles, dorsal view. 39. Male right metafemur. 40. Aedeagus, dorsal view. 41. Female sternite 8, ventral view. 42. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 40–42), 0.4 mm (Figs. 37, 38), 0.5 mm (Fig. 39).

FIGURES 22–27. Hydnobius pumilus. 22. Right antenna, dorsal view. 23. Mandibles, dorsal view. 24. Male right metafemur. 25. Aedeagus, dorsal view. 26. Female sternite 8, ventral view. 27. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 23, 25–27), 0.4 mm (Fig. 22), 0.5 mm (Fig. 24).

FIGURES 29–35. Hydnobius longidens. 29. Right antenna, dorsal view. 30. Mandibles, dorsal view. 31. Male right protibia. 32. Male right metafemur. 33. Aedeagus, dorsal view. 34. Female sternite 8, ventral view. 35. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 34, 35), 0.4 mm (Figs. 29, 30, 33), 0.5 mm (Figs. 31, 32).

FIGURES 44–50. Hydnobius kiseri. 44. Right antenna, dorsal view. 45. Mandibles, dorsal view. 46. Male right mesotibia. 47. Male right metafemur. 48. Aedeagus, dorsal view. 49. Female sternite 8, ventral view. 50. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 48–50), 0.4 mm (Fig. 44), 0.5 mm (Figs. 45–47).

FIGURES 55–61. Hydnobius autumnalis. 55. Right antenna, dorsal view. 56. Mandibles, dorsal view. 57. Male right mesotibia. 58. Male right metafemur. 59. Aedeagus, dorsal view. 60. Female sternite 8, ventral view. 61. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 55, 59, 61), 0.4 mm (Figs. 57, 58, 60), 0.5 mm (Fig. 56).

FIGURES 52–54. Hydnobius acarinus. 52. Right antenna, dorsal view. 53. Male right metafemur and metatibia. 54. Aedeagus, dorsal view. Scale bar = 0.3 mm (Fig. 54), 0.4 mm (Fig. 52), 0.5 mm (Fig. 53).