Pseudoholostrophus (Pseudoholostrophus) impressicollis (LeConte, 1874)

Pollock, Darren A., 2012, Review of the Eustrophinae (Coleoptera, Tetratomidae) of America north of Mexico, ZooKeys 188, pp. 1-153 : 7-8

Pseudoholostrophus (Pseudoholostrophus) impressicollis (LeConte, 1874) Figures 11426385365

Eustrophus impressicollis LeConte 1874: 69.-Canada, Vancouver [Island?]; Austin 1880: 40; Henshaw 1885: 124.

Holostrophus impressicollis (LeConte).- Horn 1888: 36; Champion 1898: 66; Leng 1920: 238; Csiki 1924: 10; Hatch 1965: 67, Plate IX, fig. 1; LeSage 1991: 246; Poole and Gentili 1996: 299.

Pseudoholostrophus (Pseudoholostrophus) impressicollis (LeConte).- Nikitsky 1998: 47; Young and Pollock 2002: 416; Pollock 2008: 268, 290.

Diagnosis.

This distinctive species may be separated by all other Nearctic Eustrophinae by the following combination of characters: color uniformly red-brown; dorsal setae very short, inconspicuous; eyes widely separated; meso- and metatibiae smooth, without oblique ridges; distribution in westernmost North America.

Description.

Nikitsky (1998: 47-48, plate 7, Figures 9-11) provided a fairly detailed description of Pseudoholostrophus impressicollis .The following abbreviated description was taken from Pollock (2008: 268). TL 6.0-6.2 mm; GEW 2.0-2.7 mm. Body elongate oval, moderately parallel sided (Fig. 1), moderately convex dorsally (Fig. 14); dorsal and ventral color uniformly dark rufous, including antennae and legs; dorsal pubescence very short, inconspicuous; eyes widely separated (> 3 × length of first antennomere) (Fig. 26), medial margin of eye slightly emarginate; antennae moderately elongate, antennomeres 7-10 distinctly widened (Fig. 26); antennomere 7 triangular, 8-10 wider than long; antennal sensilla completely annular; last maxillary palpomere distinctly widened, securiform; prosternal process (Fig. 38) elongate, spatulate distally, extended past posterior margin of procoxae, bent dorsally at distal end; prothoracic episternal suture absent; elytral punctation fine, punctures not arranged in longitudinal striae; meso- and metatibiae with scattered short spines, without oblique ridges (Fig. 53).

Distribution

(Fig. 65). The range of this species is restricted to the western coast of North America, from the Queen Charlotte Islands in the north, to west central California. Hatch (1965) recorded it from Washington State, without giving a detailed locality. Only 21 specimens were examined, from the following: CANADA: BRITISH COLUMBIA. UNITED STATES: CALIFORNIA: Alpine, Humboldt, Siskiyou, Trinity. OREGON: Curry, Josephine, Lane, Lincoln, Polk. (Complete label data given in Appendix 1).

Types.

Eustrophus impressicollis LeConte. LECTOTYPE, sex unknown, labeled "Vanc. / Type 4781 / Eu. impressicollis Lec.", in MCZ.

Natural history.

Label data: under bark of pine; in rotten log; fungus.