Platyhydnobius arizonensis ( Horn, 1885 ) 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 : 52-53

Platyhydnobius arizonensis ( Horn, 1885) , new combination

( Figs. 7 , 143–147 , 148 )

Hydnobius arizonensis Horn, 1885: 138 .

Type material. Hydnobius arizonensis , holotype, by monotypy, male [described as female] in MCZC; bearing white label “Ari.”; red label “ HoloTYPE / 3009”; red label “M.C.Z. / Holotype / 33557”; white handwritten label “H. / arizonensis / Horn ”; and our red holotype label; seen and dissected. Type locality: " Arizona ", an unspecified locality .

Additional material examined. We examined 252 specimens (See Appendix).

Diagnosis. Body yellowish to reddish brown, shining. Length of pronotum + elytra = 2.8–3.5 mm (males), 2.7–3.2 mm (females). Head densely punctate, punctures larger than those of pronotum. Pronotum widest at basal two-fifths; sides weakly, obtusely rounded at basal two-fifths; basal angles obtuse; broad, ratio length:width = 1:1.7; finely punctate with faint, reticulate microsculpture. Elytra wider than pronotum, ratio length:width = 1:0.75; with 9 regular, closely punctate striae; striae 6 and 7 do not reach apex, stria 8 does not reach base, stria 1 weakly impressed; intervals with scattered minute punctures, transversely striolate. Antennal club ( Fig. 143 ) moderately broad, ratio club width:length = 1:2.9; width ratio of antennomeres 7:8:9 = 1.5:1:2.0. Mandibles ( Fig. 144 ) moderately elongate, a thin plate forming inner margin apically. In both sexes, all femora unarmed; all tibiae slender, spinose on outer margin, protibiae and mesotibiae weakly widened apically, male mesotibia weakly curved. Male. Aedeagus ( Fig. 145 ) with median lobe elongate, apex evenly narrowed. Parameres longer than median lobe, with small lobes laterally near base, flat, apices expanded, thin, with two setae dorsally before apex and many small setae covering apices. Female. Coxites ( Fig. 147 ) moderately elongate, cylindrical, with apical and subapical setae; styli elongate, inserted at apices of coxites. Sternite 8 ( Fig. 146 ) rounded apically; anterior apophysis broad, apex rounded.

Distribution. The species occurs across forested northern North America and seemingly with at least one disjunct population in the south in the montane forests of Mount Graham, Arizona ( Fig. 148 ). We have seen specimens from Canada: the provinces of Alberta, British Columbia, Manitoba, New Brunswick, Nova Scotia, Newfoundland, Ontario, and Quebec; USA: the states of Alaska and Arizona. The absence of other records in the United States is puzzling.

Field notes and habitats. Adults have been collected in mixed deciduous and coniferous forest habitats, most frquently with flight interecept traps and a few by evening car netting and in litter sifting.

Seasonality. Adults have been collected in the months of June to October, with the greatest numbers in July (93) and August (133).

Figures

FIGURE 148. Known North American localities of Platyhydnobius arizonensis (black dots) and P. validus (open squares).

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 143–147. Platyhydnobius arizonensis. 143. Right antenna, dorsal view. 144. Mandibles, dorsal view. 145. Aedeagus, dorsal view. 146. Female sternite 8, ventral view. 147. Female coxites and styli, ventral view. Scale bar = 0.3 mm (Figs. 145, 147), 0.4 mm (Fig. 146), 0.5 mm (Figs. 143, 144).