Atomaria nigrirostris Stephens 1830

Atomaria nigrirostris Stephens, 1830

LABRADOR: Middle Brook, June 2–17, 2005, July 4–18, 2005, S. Pardy, boreal forest, pitfall (5, MUN); Ossak Camp, June 28-July 11, 2004, S. Pardy, subarctic black forest, pitfall (1, MUN). NEWFOUNDLAND: Portugal Cove: Indian Meal Line, July 1, 1979, June 23, 1980 (2, AAFC); South Pond near South Brook, June 27, 1980, Brennan & Larson, drift (2, AAFC); Little Grand Lake, 2 km E Martin Pond, June 8-July 13, 1993, old fir, pitfall (1, AAFC); Glide Lake, June 23, 1994, W. Bowers et al. (1, CFS). NOVA SCOTIA: Annapolis Co.: Big Dam Lake, June 27-July 7, 2004, H. Love, eastern hemlock forest (2, CGMC); Cumberland Co.: Wentworth, May 21- July 5, 1965, B. Wright (1, NSMC); Wentworth Park, July 12, 1993, J. & T. Cook, car net (2, JCC); Westchester-Londonderry, July 20, 1992, S. & J. Peck, forest road, car net (5, JCC); Guysborough Co.: Trafalgar, Liscomb Sanctuary, July 19, 1992, S. & J. Peck, car net (9, JCC); Halifax Co.: Long Lake, May 25, 2002, C.G. Majka, along stream (1, CGMC); Pockwock Lake, 2–15 June, 1997, D.J. Bishop, red spruce (mature), FIT (1, NSMC); Upper Tantallon, Indian Lake Rd., July 17, 1992, S. & J. Peck, car net (1, JCC); Hants Co.: Frenchmen’s Cave, July 2, 1998, M. Moseley, gypsum sinkhole (1, CGMC); Queens Co.: Caledonia, July 25, 1992, J. & F. Cook, interior mixed forest, car net (4, JCC); Medway River, July 13, 1993, J. & T. Cook, car net (15, JCC); North Cranberry Lake, August 13–24, 2004, June 28-July 8, 2004, H. Love, eastern hemlock forest (2, CGMC); Shelburne Co.: Clyde River Rd, July 16, 1992, S. & J. Peck, forest, car net (4, JCC); Yarmouth Co.: Wellington, June 1–7, 1999, J. & F. Cook, mixed coastal forest, FIT (3, JCC); Yarmouth-Shelburne: Oak Park Rd., August 27, 1992, J. & F. Cook, car net (3, JCC).

Atomaria nigrirostris is newly recorded in Labrador, insular Newfoundland, Nova Scotia, and Canada (Fig. 16, 17). In North America, it has previously been recorded in Alaska (Leng 1920; Bousquet 1991) under the name Atomaria fuscicollis Mannerheim, 1852, synonymized by Johnson et al. (2007). In the Palaearctic region it is found throughout Europe (including Turkey), in Algeria in North Africa, across Siberia to the Russian Far East, south to Mongolia, and in central Asia in Iran and Uzbekistan (Johnson et al. 2007). In Atlantic Canada it has been collected in eastern hemlock, red spruce, and mixed forests, along a stream, and in a gypsum sinkhole. Lohse (1967) reported it in Europe from along rivers, under leaves. Johnson (1993) reported that it was, “a woodland species, mostly associated with broadleaved trees, it occurs on and under dead wood on the ground, in moss, leaf litter, flood refuse and general ground litter. It also occurs under hedgerows.”

Description: Head, pronotum, and pro-, meso-, and meta-sterna piceous brown; elytra and abdominal sterna a slightly paler, fuscous brown; elytra becoming slightly paler in apical half. Head, pronotum, and elytra moderately densely, moderately strongly punctate; interspaces 1.0–1.5 times the diameter of punctures; apex of elytra slightly more finely punctate; elytral setae approximately the length of the interspaces, prominent and somewhat erect. Pronotum strongly constricted from midpoint to apex, parallel from midpoint to pronotal base; before base with a strong transverse impression, with several fine and sharp longitudinal ridges. Elytra scarcely, or not, wider than pronotum (Fig. 10). Antennae: antennomere 1 long and curved, twice as long as 2 and approximately twice as wide at apex than at base; 2 cylindrical; 3 as long as 2 but more slender; 4, 6, and 8 short and bead-like; 5 and 7 somewhat longer; club distinct; antennomeres 9 and 10 clearly transverse (Fig. 1.7). Body: width/length ratio, 0.31; length, 1.7–1.9 mm.