Hydnobius laticeps Notman, 1920

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 : 19-20

Hydnobius laticeps Notman, 1920

( Figs. 37–42 , 43 )

Hydnobius laticeps Notman, 1920: 27 .

Type material. Holotype, by monotypy, male in SIIS; bearing white label “Schoharie / Schoh Co. N.Y. / 10 June 1918 / H. Notman ”; white handwritten label with red band “ Hydnobius / laticeps / TYPE”; seen. Type locality: Schoharie, New York.

Additional material examined. We have examined 68 specimens (See Appendix).

Diagnosis. Body yellowish to reddish brown, shining. Length of pronotum + elytra = 2.0–2.4 mm (males), 1.9–2.4 mm (females). Head irregularly, sparsely punctate. Pronotum widest near middle, sides rounded, basal angles obtuse; ratio length:width = 1:1.4; finely punctate with fine reticulate microsculpture. Elytra slightly wider than pronotum; ratio length:width = 1:0.8; Stria 1 clearly impressed, remaining striae punctate; interval punctures in regular rows, similar in size to strial punctures; with irregular transverse strioles. Antennal club ( Fig. 37 ) moderately broad, ratio club width:length = 1:2.8; antennomere 7 narrow, only slightly wider than antennomere 8; width ratio of antennomeres 7:8:9 = 1.1:1:1.5. Mandibles ( Fig. 38 ) moderately elongate; right mandible bidentate apically, with a submedian tooth and small denticle on inner margin; left mandible with a tooth on apical one-half of inner margin. Profemur and mesofemur unarmed in both sexes. Male metafemur ( Fig. 39 ) with large tooth on posterior margin before apex; posterior margin basal to tooth may be irregularly serrulate; female unarmed. Protibia and mesotibia weakly widened apically in both sexes; male metatibia weakly widened apically, female metatibia slender. All tibiae in both sexes spinose on outer margin. Male. Aedeagus ( Fig. 40 ) with median lobe broad, abruptly narrowing to acute apex. Parameres narrow, straight, with two apical setae. Internal sac densely covered with small scale-like setae with acute apices. Female. Coxites ( Fig. 42 ) short, cylindrical, with apical and subapical setae; styli small, inserted at apices of coxites. Sternite 8 ( Fig. 41 ) rounded apically; anterior apophysis broadly triangular.

Distribution. The species occurs in Northeastern and North Central North America ( Fig. 43 ). We have seen specimens from Canada: the provinces of Manitoba, Ontario, Quebec; USA: the states of Illinois, New York, Vermont, Wisconsin.

Field notes and habitats. Adult specimens have been most frequently caught in forested habitats by evening car netting and at UV light traps, and a few in flight intercept traps. Some were attracted to traps by allyl isothiocyanate in old field habitats.

Seasonality. Adults of the species have been collected from May to October, with most specimens in July.

Figures

FIGURE 43. Known eastern North American localities of Hydnobius laticeps (black dots).

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).