Hydnobius kiseri Hatch, 1936

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 : 20-22

Hydnobius kiseri Hatch, 1936 , resurrected status

( Figs. 44–50 , 51 )

Hydnobius kiseri Hatch, 1936: 35 .

Type material. Holotype male in USNM; bearing white label “Harper Wash / VII 4 1931 / R.W. Kiser ”; pink handwritten label “TYPE / Hydnobius / kiseri / 1933 – M.H. Hatch ”; white handwritten label “ Hydnobius / pumilus / LeC. [male symbol] / M. Hatch – 1953”; white partly handwritten label “pumilus / LeC. [male symbol] / compared with type / M.H. Hatch 1955”; white partly handwritten label “latidens / LeC. [male symbol] / compared with type / M.H. Hatch 1955”; and our red holotype label; seen and dissected. Type locality: Harper , Washington State, USA.

Additional material examined. We examined 484 specimens (See Appendix).

Diagnosis. Body yellowish to reddish brown, shining. Small, length of pronotum + elytra = 1.7–2.5 mm (males), 1.9–2.4 mm (females). Head irregularly punctate. Pronotum widest near middle, sides rounded, basal angles obtuse; ratio length:width = 1:1.4; finely punctate with faint reticulate microsculpture. Elytra of medium length, slightly wider than pronotum, ratio length:width = 1:0.7; stria 1 clearly impressed, remaining striae punctate, intervals punctate and transversely striolate. Antennal club ( Fig. 44 ) moderately slender, ratio club width:length = 1:3.3; width ratio of antennomeres 7:8:9 = 1.3:1:1.7. Mandibles ( Fig. 45 ) moderately elongate; right mandible bidentate, with a submedian tooth and small denticle on inner margin; left mandible with a tooth on apical one-half of inner margin. Mesoventrite with a median longitudinal carina. Profemur and mesofemur of both sexes unarmed. Male metafemur ( Fig.47 ) with large tooth before apex of posterior margin; posterior margin may be serrulate basal to apex of tooth. Female metafemur unarmed. Protibia widened apically in male, slender in female. Male mesotibia ( Fig. 46 ) with inner margin weakly curved and apically lobed. Male metatibia with inner margin angulate near basal one-third; apical two-thirds widened. Female mesotibia and metatibia slender, straight. All tibiae of both sexes spinose on outer margin. Male. Aedeagus ( Fig. 48 ) with median lobe broad, narrowing to acute apex. Parameres curved outwardly, with two apical setae. Internal sac densely covered with minute spines. Female. Coxites ( Fig. 50 ) elongate, cylindrical, with setae at apices and near midpoint; styli small, inserted at apices of coxites. Sternite 8 ( Fig. 49 ) rounded apically; anterior apophysis narrow apically.

Nomenclatural notes. The species was placed into synonomy under H. pumilus LeConte by Hatch (1957: 26). It is here resurrected to valid species status based on characters of the parameres revealed by dissections and not seen by Hatch, and the carinate mesoventrite which easily separates H. kiseri from all other Nearctic Hydnobius .

Distribution. The species occurs in Pacific coastal North America, from southwestern British Columbia near Vancouver, south to southwestern California at San Diego ( Fig. 51 ). We have seen specimens from Canada: the province of British Columbia, and USA: the states of California, Oregon, and Washington.

Field notes and habitats. Adults have been collected in moist forest habitats, especially in humid coast redwood forests and seasonal oak forests, and humid forested ravines and gullies. Collections are mostly from flight intercept traps and by sifting forest litter.

Seasonality. Adults have been collected mostly in the moist winter, spring, and early summer months from December to a peak in June, with few or none in July to November.

Figures

FIGURE 51. Known western North American distribution of Hydnobius kiseri (black dots) and H. acarinus (black star).

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).