Macrohydnobius montanus 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 : 47-50

Macrohydnobius montanus Peck & Cook , new species

( Figs. 6 , 132–138 , 139 )

Type material. Holotype: ♂ ( CMNC). CANADA: British Columbia: 16 km E Golden , 28.VI–18.VIII.88, S. & J. Peck, 1100 m, mature cedar, birch, spruce forest, FIT . Paratypes (62). CANADA: British Columbia: with same data, 8♂, 10♀♀ ( SBPC) ; 14 km E Coal R., 160 km E Watson L., YT, 14.VI–3.IX.1984, S. & J. Peck, spruce-alder for. FIT, ♀ ( SBPC) ; Creston , 7.XII.1931, G. Stace Smith, ♀ ( CNCI) ; with same data, ♀ ( SMDV) ; same data except 4.XII.1931, ♀ ( SMDV) ; with same data, ♀ ( MCZC) ; same data except 12.XII.1951, ♀ ( OSUC) ; same data except 3.XII.1953, ♀ ( OSUC) ; same data except 3.XII.1950, on snow, ♀ ( CASC) ; same data except 25.XI.1948, ♀ ( OSUC) ; Diamond Head Trail , 2.I.1983, 3000’, S.G. Cannings, on snow, 0°, ♀ ( SMDV) ; Glacier Nat. PK., Illecillewaet , 13.II.1977, John Woods, on snow surface at 1°, ♀ ( CNCI) ; Manning Park, Lightning Lks. , 18.II.1983, 4000’, S.G. Cannings, on fresh snow, 3–5°C., ♀ ( SMDV) ; Salmon Arm , 16.XI.1930, E.R. Bucknell, ♀ ( CASC) ; Vancouver, Lions Bay , 9.V.1965, G.J. Spencer, ♀ ( SMDV) ; Yoho Nat. Pk., Wapta Lake , 26.VI–19.VIII.1988, S. & J. Peck, lodgepole pine for. FIT, ♀ ( SBPC) ; Alberta: 11 mi. NE Robb , 4.VIII–10.X.1985, R.S. Anderson, FIT, ♂ ( SBPC) ; Sibbold Flats Rec. Area , 6–20.IX.1981, R.S. Anderson, FIT, ♀ ( SBPC) ; Waterton Lakes N. Pk. , km 9, Chief Mt. Hwy., 28.VII.1980, D.E. Bright, ♀ ( CNCI) ; UNITED STATES: California: Yosemite Val. , 20.VI.1921, ♂ ( CASC) ; Calaveras Co., Calaveras Big Trees St. Pk. , 8–15.VII.2005, 4658’, A.R. Cline & S.D. Gaimari, malaise tp. on hillside, ♂ ( SBPC) ; El Dorado Co., Harvey West Cabin nr. China West Cpgd. , 6.VII.2006, 4700’, A. Cline, S. Winterton, BL / MV lights, ♂ ( SBPC) ; Fresno Co., Billy Cr. at Huntington L., 3–10.VII.1984, D.J. Burdick, 2♂ ( CASC) ; Nevada Co. , Sagehen Cr., 13–16.VII. 1994, 1920 m, C.W. Thompson, ♂ ( SBMN) ; Idaho: Benewah Co., Crystal Cr. , 22.XII.1962, on snow, ♀ ( WFBM) ; 6 mi SW Emida , 11.XI.1984, R.C. Biggam, ♀ ( WFBM) ; Clark Co., 2.8 km W I15, Stoddard Cpgd. Rd., 5.5 km N Spencer , 10.VI–17.VII.1987, 2000 m, T.G. Spanton, spruce, fir, aspen for., ♀ ( SBPC) ; Latah Co., UI Exp. For., Flat Cr. , ca 6 mi SE Harvard, 11.II.1995, J.J. Pfeiffer, 2♀♀ ( WFBM) ; Montana: Flathead Co., Glacier N. Pk., McDonald Ck. Drainage, 150 m WNW McDonald R.S., 1.IX–7.X. 1992, 953 m, K.A. Keating, pitfall, ♂ ( MTEC) ; same data except 700 m NE Moose Country , 7.X.1992 – 13.V. 1993, 1040 m, ♀ ( MTEC) ; Glacier N. Pk., N. Fork Flathead area , Mud Ck., old growth, 28.VIII–4.IX.1990, 3760’, M.A. Ivie, FIT, ♂ ( MTEC) ; same data except S. Big Prairie, 9–16.IX.1991, 3560’, ♀ ( MTEC) ; same data except S. Lone Pine Prairie, 12–19.VIII.1993, 3600’, ♀ ( MTEC) ; Gallatin Co., Blackmore Ck., 8.VI–26.IX.1989, 7200’, D.L. Gustafson, FIT, ♂ ( MTEC) ; Madison Co., Hidden Lake Bench , 22.VII–9.IX.1989, 7400’, D.L. Gustafson, FIT, 3♂, 4♀♀ ( MTEC) ; Nevada: no other data, ♀ ( MCZC, Horn Coll.) ; Oregon: no other data, ♀ ( MCZC, Horn Coll.) .

Diagnostic description. Body reddish brown, shining. Length of pronotum + elytra = 3.7–4.8 mm (males), 4.0–5.0 mm (females). Head moderately coarsely punctate, without microsculpture. Pronotum widest at basal one-third, sides obtusely rounded, basal angles obtuse; with a pair of small basal impressions joined by a transverse, closely punctate impressed line; ratio length:width = 1:1.5; moderately coarsely punctate with microsculpture of short, irregular lines. Elytra elongate, wider than pronotum, ratio length:width = 1:0.7; with 9 regular, closely punctate striae, striae 6 and 7 do not reach apex, stria 1 impressed posteriorly; intervals with 2–3 rows of fine punctures, transversely striolate, uneven intervals with scattered larger punctures. Antennal club ( Fig. 132 ) moderately broad, ratio club width:length = 1:2.9; width ratio of antennomeres 7:8:9 = 1.4:1:1.6. Mandibles ( Figs. 133, 134 ) elongate, sexually dimorphic. Left mandible with tooth on outer margin, acute tooth on apical one-half of inner margin. Male right mandible ( Fig. 133 ) strongly curved apically and lacking tooth on outer margin; in female ( Fig. 134 ) less strongly curved apically and with tooth on outer margin; both sexes with two teeth at middle of inner margin. Metatrochanter of male with small blunt tooth before apex. All femora in both sexes unarmed. Male protibia ( Fig. 135 ) broad at apex, outer margin spinose in apical one-half; apex broadly concave dorsally; apical spur large, sinuate; female protibia widened apically. Mesotibia and metatibia in both sexes widened apically, spinose. Male. Aedeagus ( Fig. 136 ) with median lobe elongate, broad in basal one-half, narrowly triangular in apical one-half. Parameres inserted near middle of median lobe, broad, flat, narrowing apically, with pair of setae at apex. Internal sac with scale-like setae, and near middle ( Fig. 136 , arrow) a pair of multidentate sclerites. Female. Coxites ( Fig. 138 ) broad, flat, with narrow apices curved dorsad; styli moderately robust, inserted on ventral face of coxites; coxites with setae in area of insertion of styli. Sternite 8 ( Fig. 137 ) truncate apically; anterior apophysis truncate apically.

Distribution. The species occurs in northwestern North America ( Fig. 139 ). We have seen specimens from Canada: the provinces of Alberta and British Columbia; USA: the states of California, Idaho, Montana, Nevada, and Oregon.

Field notes and habitats. Adults have been collected in mixed forests of spruce-alder, or spruce-fir-aspen or lodgepole pine, and most commonly in flight interecept traps or on snow, and a few at uv light traps and in pitfall traps or malaise traps.

Seasonality. Adults have been collected in all months except March and April, but usually in low numbers, with larger numbers in August (30), September (12), and December (8).

Etymology. Named with reference to the western mountain habitat of this species.

Figures

FIGURE 139. Known western North American localities of Macrohydnobius montanus (black dots).

FIGURES 5–7. Sogdini, habitus photos. 5. Kalohydnobius dentatus, total length 2.6 mm. 6. Macrohydnobius montanus, total length 4.9 mm. 7. Platyhydnobius arizonensis, total length 2.7 mm.

FIGURES 132–138. Macrohydnobius montanus. 132. Right antenna, dorsal view. 133. Male mandibles, dorsal view. 134. Female mandibles, dorsal view. 135. Male right protibia. 136. Aedeagus, dorsal view. 137. Female sternite 8, ventral view. 138. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Fig. 138), 0.5 mm (Figs. 136, 137), 0.75 mm (Fig. 132), 1.0 mm (Figs. 133–135).