Platyhydnobius validus Peck & Cook 2009, new combination

Platyhydnobius validus (Brown, 1932b), new combination

(Figs. 148, 149–155)

Hydnobius validus Brown, 1932b: 202.

Type material. Hydnobius validus, holotype, male, in CNCI; bearing white label “Thunder Riv. / Que. 27.VIII.1930 / W.J. Brown ”; and red label “ HOLOTYPE / Hydnobius / validus / 3223 No. / Brown”; seen and dissected. Type locality: PQ: Thunder River [Rivière-au-Tonnerre].

Additional material examined. We examined 38 specimens (See Appendix).

Diagnosis. Body yellowish to reddish brown, shining. Length of pronotum + elytra = 3.3–4.2 mm (males), 3.7–4.4 mm (females). Head finely, densely punctate; transverse groove at level of posterior margins of eyes. Pronotum widest at basal two-fifths, sides obtusely rounded at basal two-fifths, basal angles obtuse; ratio length:width = 1:1.6; moderately coarsely punctate, without microsculpture. Elytra wider than pronotum, ratio length:width = 1:0.8; with 9 regular, closely punctate striae; striae 6 and 7 do not reach apex; stria 8 does not reach base; stria 1 weakly impressed; intervals finely, irregularly punctate. Antennal club (Fig. 149) broad, ratio club width:length = 1:2.1; width ratio of antennomeres 7:8:9 = 1.6:1:1.9. Mandibles (Fig. 150) moderately elongate with a thin plate forming inner margin of apical one-half. Male profemur unarmed; male mesofemur (Fig. 151) with tooth on apical one-third of posterior margin; male metafemur (Fig. 152) with narrow tooth on apical one-third of posterior margin; all femora unarmed in female. Protibia in both sexes broad at apex with broad depression on apical two-fifths of dorsal surface, outer margin spinose; mesotibia and metatibia of both sexes widened apically, outer margins spinose. Male. Aedeagus (Fig. 153) with median lobe broad, evenly tapered apically. Parameres inserted at basal one-fifth of median lobe, longer than median lobe, broad, flat, lobed laterally near base. Paramere apices thin, with two setae dorsally before apex and several setae at apex. Female. Coxites (Fig. 155) elongate, moderately broad, narrowing apically; small styli inserted at apices of coxites. Sternite 8 (Fig. 154) broadly rounded apically; anterior apophysis moderately broad, apex rounded.

Distribution. The species occurs in northern North America from central Alaska to Quebec and down the Rocky Mountains to New Mexico (Fig. 148). We have seen specimens from Canada: the provinces of Alberta, Manitoba, Quebec and Yukon Territory; USA: the states of Alaska and New Mexico.

Field notes and habitats. Habitat data are few. Adults were collected in flight intercept traps in spruce–willow and aspen thickets along streams, and eleven specimens in rotary traps at Matanuska, Alaska.

Seasonality. Adults have been collected from June to August with most specimens in July.