Macrohydnobius crestonensis ( Hatch, 1957 ) Peck & Cook, 2009

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 : 41-44

Macrohydnobius crestonensis ( Hatch, 1957) , new combination

( Figs. 116–121 , 122 )

Hydnobius crestonensis Hatch, 1957: 23 . Type material. Hydnobius crestonensis , holotype, male, in SMDV, bearing white label “Creston, B.C. / 20–XI 1948 / G. Stace Smith ”; white handwritten label “on snow”; red handwritten label “TYPE [male symbol] / Hydnobius / crestonensis / 1954— M. Hatch ”; white label “ Ex. G. Stace-Smith / collection / purchased 1960”; white handwritten label with black border “ Hydnobius / crestonensis / Hatch”; seen and dissected. Type locality: Creston, BC.

Additional material examined. We examined 64 specimens (See Appendix). Diagnosis. Body reddish brown, shining. Length of pronotum + elytra = 4.0–6.1 mm (males), 4.2–5.6 mm (females). Head finely, densely punctate; with a broad, shallow depression between eyes and extending onto clypeus. Pronotum narrow, widest at basal one-third; sides weakly, obtusely rounded; basal angles obtusely rounded; with a pair of small basal impressions joined by an irregular row of punctures; ratio length:width = 1:1.4; finely, irregularly punctate with no microsculpture. Elytra elongate, slightly wider than pronotum, ratio length:width = 1:0.6; with 9 closely punctate striae; stria 1 impressed posteriorly, striae 6 and 7 do not reach apex; intervals with 2–3 rows of fine punctures and transversely striolate; uneven intervals with scattered larger punctures. Antennal club ( Fig. 116 ) slender, ratio club width:length = 1:3.6; width ratio of antennomeres 7:8:9 = 1.4:1:1.6. Mandibles ( Fig. 117 ) elongate, broad at base, narrow apically; lacking teeth on outer margins; both mandibles with a single tooth on apical one-half of inner margin. Male metatrochanter with small blunt tooth before apex. All femora unarmed in both sexes. Male protibia ( Fig. 118 ) broad at apex, apex concave dorsally; outer margin with 2 short spines near middle, 2 at apex; apical spur large; female protibia widened apically, spur unmodified. Mesotibia and metatibia of male widened apically, spinose; narrower in female, spinose. Male. Aedeagus ( Fig. 119 ) with median lobe broad, apical one-half narrowing to triangular apex; parameres partly envelop sides of apical one-half of median lobe; each paramere with one longer seta and a small fleshy lobe at apex. Internal sac with two curved strings of broad, flat setae that overlay in a single row, and additional small patches of setae. Female. Coxites ( Fig. 121 ) broad, flat, with narrow apices curved dorsad; small styli inserted on ventral face of coxites; coxites with setae in area of insertion of styli. Sternite 8 ( Fig. 120 ) shallowly emarginate apically, anterior apophysis broadly triangular.

Distribution. The species occurs in northwestern North America ( Fig. 122 ). We have seen specimens from Canada: the provinces of Alberta and British Columbia; USA: the states of California, Idaho, Montana, Oregon, and Wyoming.

Field notes and habitats. Adults have been collected most frequently on snow (13) in mixed forests, including spruce-fir-pine and oak-laurel, and few were taken in flight intercept traps and one in a pitfall trap.

Seasonality. Adults have been collected in all months except February and April, but in low numbers except for September (12), November (27), and December (13).

Figures

FIGURE 122. Known western North American localities of Macrohydnobius crestonensis (black dots).

FIGURES 116–121. Macrohydnobius crestonensis. 116. Right antenna, dorsal view. 117. Mandibles, dorsal view. 118. Male right protibia. 119. Aedeagus, dorsal view. 120. Female sternite 8, ventral view. 121. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Fig. 121), 0.5 mm (Fig. 120), 0.75 mm (Figs. 116, 119), 1.0 mm (Figs. 117, 118).