Pseudoholostrophus (Holostrophinus) discolor (Horn, 1888)

Pollock, Darren A., 2012, Review of the Eustrophinae (Coleoptera, Tetratomidae) of America north of Mexico, ZooKeys 188, pp. 1-153 : 8-9

Pseudoholostrophus (Holostrophinus) discolor (Horn, 1888) Figures 215273965

Holostrophus discolor Horn 1888: 36.-U.S.A., Virginia ("Two specimens collected in Virginia by Mr. Ulke..."); Henshaw 1889: 131; Champion 1898: 66; Leng 1920: 238; Csiki 1924: 10; LeSage 1991: 246; Poole and Gentili 1996: 299.

Pseudoholostrophus (Holostrophinus) discolor (Horn).- Nikitsky 1998: 43; Young and Pollock 2002: 416; Pollock 2008: 269, 290.

Diagnosis.

This species may be diagnosed on the following combination of characters: eyes widely separated; dorsal setae conspicuous; pronotum with anterior margin elevated above level of head; meso- and metatibiae smooth, without oblique ridges; distribution in eastern North America.

Description.

Nikitsky (1998: 43-44, plate 7, Figures 12-15) provided a description of the adult of Pseudoholostrophus (Holostrophinus) discolor , based on examination of a single specimen only. Pollock (2008: 269) provided the following shorter description: TL 3.6-5.7 mm; GEW 1.6-2.4 mm; body (Fig. 2) elongate oval, rather parallel-sided, moderately convex dorsally (Fig. 15); dorsal color rufous, pronotum in most specimens slightly darker than elytra; some specimens with lighter humeral area on elytra; antennomeres 1-5 rufous, 6-10 rufopiceous, 11 light rufous; venter uniformly red-brown; dorsal pubes cence relatively long, conspicuous, with some erect hairs; eyes widely separated (space> 3 × length of antennomere 1), inner eye margin slightly emarginate; antennae (Fig. 27) relatively short, antennomere 7-11 distinctly widened; antennomere 7 triangular, 8-10 distinctly wider than long; antennal sensilla completely annular; last maxillary palpomere slightly widened, subsecuriform; prosternal process (Fig. 39) elongate, spatulate distally, extended to past posterior margin of procoxae, bent dorsally at distal end; prothoracic episternal suture absent; elytral punctation relatively coarse, punctures not arranged in longitudinal striae; meso- and metatibiae with scattered short spines, oblique ridges absent.

Distribution

(Fig. 65). Relatively few specimens of this species have been collected and/or examined for this study; the known distribution is distinctly eastern, the westernmost locality being in western Indiana (Parke County). The 25 specimens examined are from the following: CANADA: NEW BRUNSWICK, QUEBEC. UNITED STATES: INDIANA: Parke. MARYLAND: Calvert, Prince Georges. MASSACHUSETTS: Middlesex. NEW HAMPSHIRE: Carroll, Grafton, Strafford. PENNSYLVANIA: Warren. RHODE ISLAND: Kent. TENNESSEE: Sevier. VIRGINIA. (complete label data in Appendix 1).

Types.

Holostrophus discolor Horn. LECTOTYPE, sex unknown, labeled "Va. / Henry Ulke Beetle Coll. CMNH Acc. No. 1645 / Holostrophus discolor Horn", in CMNH. Paralectotype in MCZ.

Natural history.

Label data: in polypore fungus; malaise trap (NH, August); intercept trap (PA, July-August; RI, July-August); on or near fleshy polypore fungi on beech log. According to Chantal (1985), individuals of this species are captured on small polypores on trunks of trees, especially Prunus pensylvanica and maples ( Acer spp.).