Sogda obtusa ( LeConte, 1879 ) 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 : 28-30

Sogda obtusa ( LeConte, 1879) , new combination

( Figs. 4 , 68 , 69–74 )

Hydnobius obtusus LeConte, 1879: 511 ; Horn 1880: 282; Hatch 1957: 25.

Hydnobius longulus LeConte, 1879: 511 ; Horn 1880: 281; Hatch 1957: 26, new synonymy.

Type material. Lectotype of H. obtusus here designated to ensure the name’s proper and consistent application, male, in MCZC; bearing white label “Garland / 22.6 Col”; white male symbol label; white handwritten label with blue line “264”; red and white label “Type / 3160”; white handwritten label “ H.

obtusus / LeC.; and our red lectotype label; seen and dissected. Leconte syntype series with two females, labeled only "B.col." and "Col.", seen. Type locality: Fort Garland , Costilla County, Colorado .

Lectotype of H. longulus here designated to ensure the name’s proper and consistent application, female, in MCZC; bearing white label “e. Cal.”; red and white label “Type / 3162”; white handwritten label “ H. longulus LeC.”; our white female symbol label; our red lectotype label; seen and dissected. We did not find the Oregon and British Colombia specimens which were published by LeConte (1879: 572) as part of his syntype series. Type locality: Eastern California (probably Lake Tahoe vicinity). [See note under H. longidens LeConte. ]

Additional material examined. We examined 138 specimens (See Appendix).

Diagnosis. Body reddish brown, shining. Length of pronotum + elytra = 2.2–3.4 mm (males), 2.2–3.7 mm (females). Head coarsely punctate. Pronotum widest near middle, sides rounded, basal angles obtusely rounded; ratio length:width = 1:1.5; coarsely punctate, no visible microsculpture. Elytra of medium length, wider than pronotum, ratio length:width = 1:0.7; with 9 regular, closely punctate striae; stria 1 clearly impressed, remaining striae weakly or not impressed; elytral intervals usually with a single row of punctures, varying in size from fine to as large as strial punctures. Antennal club ( Fig. 69 ) moderately broad, ratio club width:length = 1:2.6; width ratio of antennomeres 7:8:9 = 1.3:1:1.7. Mandibles ( Fig. 70 ) elongate, unidentate apically; right mandible with a small submedian tooth on inner margin; left mandible with a large tooth on apical one-half of inner margin. Profemur unarmed in both sexes; mesofemur of male may be serrulate on posterior margin, unarmed in female; male metafemur ( Fig. 71 ) serrulate on posterior margin, unarmed in female. Protibia and mesotibia of male widened at apex, male protibia concave dorsally at apex; male metatibia ( Fig. 71 ) elongate, curved, widened at apex; all tibiae of female weakly widened apically; all tibiae of both sexes spinose on outer margin. Male. Aedeagus ( Fig. 72 ) with median lobe broad, apical one-half evenly tapering to apex. Parameres slender, extending beyond apex of median lobe, with small lateral lobes near base, and two apical setae. Female. Coxites ( Fig. 74 ) elongate, cylindrical, with apical and subapical setae; styli small, inserted at apices of coxites. Sternite 8 ( Fig. 73 ) evenly rounded apically; anterior apophysis broadly triangular.

Distribution. The species occurs across northern North America from Quebec to Alaska and in north central and western contiguous United States from Michigan, to and down the Rocky Mountains to Utah and New Mexico, and down to California (an unspecified locality) ( Fig. 68 ). We have seen specimens from Canada: the provinces of Alberta, British Columbia, Manitoba, Ontario, Quebec and the Northwest and Yukon Territories; USA: the states of Alaska, California (unspecified locality which we cannot confirm), Colorado, Michigan New Mexico, Utah, and Washington.

Field notes and habitats. There are few label data for habitats, but various forest types are mentioned. Adults have been collected mostly by evening sweeping and car netting, and in lower numbers about equally in flight intercept and malaise traps, pan traps, at UV lights, and in rotary traps.

Seasonality. Adults have been collected from May to October, and most frequently in July.

Figures

FIGURE 68. Known North American localities of Stereus arenarius (asterisks), Sogda obtusa (black dots), Sogda enigma (open squares).

FIGURES 1–4. Sogdini, habitus photos. 1. Triarthron lecontei, total length 3.4 mm. 2. Hydnobius autumnalis, total length 3.0 mm. 3. Stereus arenarius, total length 3.4 mm. 4. Sogda obtusa, total length 3.4 mm.

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).