Eustrophopsis confinis (LeConte, 1866)

Pollock, Darren A., 2012, Review of the Eustrophinae (Coleoptera, Tetratomidae) of America north of Mexico, ZooKeys 188, pp. 1-153 : 14-15

Eustrophopsis confinis (LeConte, 1866) Figures 51830425668

Eustrophus confinis LeConte 1866: 152.-("Canada, Lake Superior, and Western States"); Crotch 1873: 112; Schwarz 1878: 463; Henshaw 1885: 124; Horn 1888: 35; Dury 1906b: 260; Csiki 1924: 10.

Eustrophinus confinis (LeConte).- Leng 1920: 238; Hatch 1965: 66; LeSage 1991: 246; Poole and Gentili 1996: 299.

Eustrophopsis confinis (LeConte).- Majka and Pollock 2006: 53; Pollock 2008: 280, 290; Majka and Pollock 2010: 455.

Diagnosis.

Eustrophopsis confinis is the only Nearctic member of this genus with very widely separated eyes dorsally. Other diagnostic features include: uniformly dark body; meso- and metatibiae with oblique ridges.

Description

(from Pollock 2008: 280). TL 4.8-6.1 mm; GEW 2.4-3.1 mm. Body ovate, subparallel-sided (Fig. 5), moderately convex dorsally (Fig. 18); dorsal and ventral color uniformly dark piceous to black; antennomeres 1-4 and 11 slightly lighter in color than antennomeres 5-10; dorsal pubescence relatively long, conspicuous; eyes widely separated (Fig. 30) (space 1-1.5 × length of antennomere 1), medial margin deeply emarginate; antennomeres 5-10 subquadrate; antennal sensilla completely annular; last maxillary palpomere unmodified, fusiform; prosternal process (Fig. 42) triangular, moderately narrowed distally, extended to slightly short of posterior margin of procoxae; prothoracic episternal suture present; elytral punctation coarse, punctures arranged in longitudinal striae; meso- and metatibiae with oblique ridges; male with small, ovate setiferous pit on ventral edge of profemur; aedeagus (Fig. 56) with basal and apical piece of segment subequal in length; struts on median lobe relatively wide and short, inner margins U-shaped; sternite 9 basally Y-shaped, with very short stem.

Distribution

(Fig. 68). Specimens of Eustrophopsis confinis are seemingly rarely collected, and localities are scattered across the northern United States and southern Canada. The record from northern Saskatchewan represents the northernmost extent of the entire subfamily in North America. The 32 specimens are from the following jurisdictions: CANADA: BRITISH COLUMBIA, MANITOBA, NOVA SCOTIA, ONTARIO, SASKATCHEWAN. UNITED STATES: IDAHO: Kootenai, Latah. MAINE: Androscoggin. MICHIGAN: Mackinac. MONTANA: Carter, Rosebud. NEBRASKA. NEW HAMPSHIRE: Coos, Hillsborough. SOUTH DAKOTA: Pennington. WASHINGTON: Stevens. WISCONSIN. (Complete label data given in Appendix 1).

Types.

Eustrophus confinis LeConte. LECTOTYPE (designated by Pollock 2008), sex unknown, labeled "Wis / Type 4780 / E. confinis Lec", in MCZ.

Natural history.

Label data: Polyporus anceps (ME). Chantal (1985) stated that although no details were available for this species, it should probably be similar in habits and ecology to other members of the genus.

Notes.

As mentioned elsewhere, the very widely separated eyes of individuals of Eustrophopsis confinis seem to be unique within the genus, and are reminiscent of the condition seen in members of Holostrophini and Eustrophus .