Hydnobius substriatus LeConte, 1863

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 : 13-14

Hydnobius substriatus LeConte, 1863

( Figs. 15–20 , 21 )

Hydnobius substriatus LeConte, 1863: 25 ; Horn 1880: 282.

Hydnobius curvidens LeConte, 1879: 511 . Synonymized by Horn 1880: 282.

Hydnobius luggeri Hatch, 1927: 18 , new synonymy.

Type material. Lectotype of H. substriatus here designated to ensure the name's proper and consistent application, female, in MCZC, LeConte collection; bearing white label “N.Y”; red and white label “Type / 3198”; white handwritten label “ Hydnobius / substriatus / LeC."; our white female symbol label; and our red lectotype label; seen and dissected. Type locality: New York.

Hydnobius curvidens is described from unique specimen which becomes the holotype, male, in MCZC; bearing white label “La Veta / 4,7 Col”; white male symbol label; white handwritten label with blue line “266.”; red and white label:Type / 3157”; white handwritten label “ H. curvidens / LeC.”; white handwritten label “substriatus 3”; and our red holotype label; seen and dissected. Type locality: LaVeta, Huerfano County, Colorado .

Hydnobius luggeri described from unique specimen which becomes the holotype, female [described as a male], in UMSP. Bearing white label “R.A.” [interpreted by us as Russian Alaska]; white label “Otto Lugger Collection”; pink label “ HOLOTYPE ” / Hydnobius / luggeri / M.H. Hatch 1927 ”; white label “Type specimen / no. 36 / Univ. of Minn. ”; and our white female symbol label; seen and dissected. Type locality Alaska (?).

Additional material examined. We examined 588 specimens (See Appendix).

Diagnosis. Body reddish brown, shining. Length of pronotum + elytra = 2.2–2.7 mm (males), 2.1–2.9 mm (females). Head irregularly punctate. Pronotum widest near middle, sides rounded, basal angles obtuse; ratio length:width = 1:1.5; irregularly punctate, some individuals with faint reticulate microsculpture. Elytra short, wider than pronotum, ratio length:width = 1:0.8; stria 1 clearly impressed, remaining striae punctate, confused; interval punctures slightly smaller than strial punctures. Antennal club ( Fig. 15 ) moderately broad, ratio width:length = 1:2.7; width ratio of antennomeres 7:8:9 = 1.5:1:1.7. Mandibles ( Fig. 16 ) moderately elongate; right mandible bidentate apically with a submedian 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. 17 ) with large tooth on posterior margin before apex, middle one-third of posterior margin to apex of tooth may be serrulate; female metafemur unarmed. Protibia and mesotibia of both sexes weakly widened apically; metatibia of both sexes slender, weakly sinuate on inner margin in male. All tibiae, in both sexes, spinose on outer margin. Male. Aedeagus ( Fig. 18 ) with median lobe broad, narrowing to small, acute apex. Parameres broad at base, apical one-half narrow, with two apical setae. Internal sac with small setae apically and laterally, and with two elongate rows of dark setae; rows of dark setae visible posteriorly when internal sac is inverted. Female. Coxites ( Fig. 19 ) elongate, cylindrical, with apical setae; styli minute, inserted at apices of coxites. Sternite 8 ( Fig. 20 ) short, truncate apically; anterior apophysis narrowly triangular.

Taxonomic note. Daffner (1983) considered Hydnobius tibialis J. Sahlberg, 1903 to be a Holarctic species, based on his examination of specimens collected by W. J. Brown at Thunder River, Quebec, Canada. The origin of the material for his figures ( Daffner 1983, Figs. 74–76 ) is not given but we suspect that it is specimens which are part of a large series examined by us of Hydnobius substriatus LeConte, 1863 . If these specimens are truly conspecific with H. tibialis , then H. tibialis should be placed in synonymy under H. substriatus . However, since the lectotype and paralectotype of H. tibialis are female, and we have not been able to examine male specimens of this species from the Palaearctic, we cannot make this taxonomic change.

Distribution. The species occurs across northern North America from Alaska to Newfoundland and across northern United States from California to New York and south to New Mexico ( Fig. 21 ).We have seen specimens from Canada: the provinces of Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland, Nova Scotia, Ontario and Quebec, and the Northwest and Yukon Territories; USA: the states of Alaska, California, Colorado, Maine, Michigan Minnnesota, Montana, New Hampshire, New Mexico, New York, Oregon, Utah and Wyoming.

Field notes and habitats. Adults have been collected mostly in mixed forests, and some in mesic forest on sand and in tall grass prairie. Most collections are by car netting, flight interecept traps, and evening sweeping, with a few specimens from pitfall, Lindgren funnel and uv light traps.

Seasonality. Adults have been collected from March to October, with most from the months of June to August. A notable collection is of 196 specimens (in CNCI) collected from 21–28 August, 1930, by W. J. Brown at Thunder River (Rivière-au-Tonnerre), Quebec by evening sweeping .

Figures

FIGURE 21. Known North American localities of Hydnobius substriatus (black dots).

FIGURES 15–20. Hydnobius substriatus. 15. Right antenna, dorsal view. 16. Mandibles, dorsal view. 17. Male right metafemur. 18. Aedeagus, dorsal view. 19. Female coxites and styli, ventral view. 20. Female sternite 8, ventral view. Scale bar = 0.3 mm (Fig. 19), 0.4 mm (Figs. 15, 16, 18, 20), 0.5 mm (Fig. 17).

FIGURES 69–74. Sogda obtusa. 69. Right antenna, dorsal view. 70. Mandibles, dorsal view. 71. Male right metafemur and metatibia. 72. Aedeagus, dorsal view. 73. Female sternite 8, ventral view. 74. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 72, 74), 0.4 mm (Fig. 73), 0.5 mm (Figs. 69–70), 0.75 mm (Fig. 71).

FIGURES 75–78. Sogda enigma. 75. Right antenna, dorsal view. 76. Male right protibia. 77. Male right metafemur and metatibia. 78. Aedeagus, dorsal view. Scale bar = 0.3 mm (Fig. 78), 0.4 mm (Fig. 76), 0.5 mm (Fig. 75), 0.75 mm (Fig. 77).