Hydnobius longidens LeConte, 1879

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 : 17-18

Hydnobius longidens LeConte, 1879 , resurrected status

( Figs. 29–35 , 36 )

Hydnobius longidens LeConte, 1879: 511 .

Hydnobius lobatus Hatch, 1936: 35 ; 1957: 25, new synonymy.

Type material. H. longidens described from unique specimen which becomes the holotype, male, in MCZC, LeConte collection; bearing white label “Garland / 22-6 Col”; white label male symbol; white handwritten label “265”; red and white label “Type / 3161”; white handwritten label “ H. longidens / LeC.”; and our red holotype label; seen and dissected. Type locality: Fort Garland , Costillo County, Colorado .

Hydnobius lobatus described from unique specimen which becomes the holotype, female (described as a male) in USNM; bearing white label “Manchester, Wash. / IV, 22, 1934”; red label “TYPE [male symbol] / Hydnobius / lobatus / 1935 – M.H. Hatch”; our white female symbol label; and our red holotype label; seen and dissected. Type locality: Manchester, WA.

Additional material examined. We examined 294 specimens (See Appendix).

Diagnosis. Body reddish brown, shining. Length of pronotum + elytra = 2.2–3.6 mm (males), 2.1–3.6 (females). Punctation of head fine and sparse, finer than pronotum. Pronotum widest near middle, sides obtusely rounded, basal angles obtuse; ratio length:width = 1:1.4; finely punctate with faint reticulate microsculpture. Elytra of medium length, wider than pronotum, ratio length:width = 1:0.7; stria 1 clearly impressed, remaining striae punctate, confused; interval punctures slightly smaller than strial punctures. Antennal club ( Fig. 29 ) moderately broad, ratio club width:length = 1:2.7; width ratio of antennomeres 7:8:9 = 1.2:1:1.6. Mandibles ( Fig. 30 ) moderately elongate; right mandible bidentate apically, with a median tooth on inner margin; left mandible with a tooth on apical one-half of inner margin. Profemur and mesofemur of both sexes unarmed. Male metafemur ( Fig. 32 ) with a large tooth on posterior margin before apex; posterior margin basal to tooth may be irregularly serrulate; female metafemur unarmed. Both sexes with protibia widened apically; male protibial spur ( Fig. 31 ) broad; mesotibia and metatibia moderately broad in both sexes. All tibiae, in both sexes, spinose on outer margin. Male. Aedeagus ( Fig. 33 ) with median lobe broad, narrowing to small rounded lobe at apex. Parameres sinuate, concave medially at apex, with two apical setae. Internal sac apically with curved rows of broad, flat setae, and basally with a pair of sclerotized oblong lobes; lobes visible when internal sac is inverted. Female. Coxites ( Fig. 35 ) elongate, cylindrical, with apical setae; styli minute, inserted at apices of coxites. Sternite 8 ( Fig. 34 ) rounded apically; anterior apophysis broad, weakly rounded apically.

Nomenclatural notes. Horn (1880: 281) placed H. longidens LeConte into synonymy under H. longulus LeConte, 1879: 511 . However, LeConte described H. longulus from a mixed series which we recognize as Sogda obtusa (LeConte’s “ Type ”) and H. longidens (LeConte’s “ Type 2”). Horn’s action did not solve the problem of application of names. We have resolved this situation by placing H. longulus into synonymy under Sogda obtusa ( LeConte, 1879) . Our action of attaching names to actual specimens clarifies and stabilizes use of the names.

Distribution. The species occurs across North America, from Yukon Territory to Quebec in the north and North Carolina through Arkansas, Oklahoma, and New Mexico to California in the south ( Fig. 36 ). We have seen specimens from Canada: the provinces of British Colombia, Manitoba, Ontario, Quebec, and Yukon Territory; USA: the states of Arkansas, Arizona, California, Colorado, Idaho, Indiana, Minnesota, Montana, North Carolina, New Mexico, Ohio, Oklahoma, Oregon, Utah, Virginia, and West Virginia.

Field notes and habitats. Most adults have been collected by flight intercept traps and evening sweeping or car netting, in deciduous forests, and infrequently in coniferous forests, or by litter sifting or at black light or in pitfall traps.

Seasonality. Adults have been collected from January to September, with the greatest number in June.

Figures

FIGURE 36. Known North American localities of Hydnobius longidens (black dots).

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).