Atomaria ephippiata Zimmerman 1869

Atomaria ephippiata Zimmerman, 1869

LABRADOR: Otter Creek, Goose Bay, July 28-August 8, 2008, G.R. Pohl & D.W. Langor, forb meadow, 15 m, pitfall (4, MUN). NEW BRUNSWICK: Sunbury Co.: Burton, May 25, 1972, D.H. Murray (3, MMUE); Westmorland Co.: Pointe-du- Chene, August 24, 1972, D.H. Murray (2, MMUE); Sackville, August 27, 1982, P. Maltais (1, CGMC); York Co.: New Maryland, June 26, 2003, R.P. Webster, mixed forest, at light (1, RWC); New Maryland, April 15, 2004, R.P. Webster, mixed forest, compost (1, RWC). NEWFOUNDLAND: Cinq Cerf River, June 16, 1949, E. Palmen (1, MZHF); Burnt Cape, August 7–21, 2003, A.M. Hynes, coastal meadow, pitfall (1, CFS); Glide Lake, June 13, 1996, July 11, 1996, July 25, 1996, pitfall, August 8, 1996 (4, CFS); Glide Lake, July-August, 1994, C. Bassler (1, MUN). NOVA SCOTIA: Annapolis Co.: Durland Lake, June 6, 2003, P. Dollin, hemlock/balsam fir/black spruce (120+ years), sweeping (1, NSMC); Colchester Co.: Bible Hill, June 15–24, 2005, May 31, 2005, K.R. Aikens, pasture, pitfall trap (4, CBU); Bible Hill, June 15, 2007, June 19, 2007, July 8, 2007,C.W. D’Orsay, pasture, sweeping (6, CBU); Debert, July 13 1994, J. Ogden (1, NSNR); Cumberland Co.: Amherst, June 24, 1994, J. Ogden (1, NSNR); Oxford, July 31, 1988, August 11, 1988, E. Georgeson, uv light trap (2,

Québec Newfoundland Gaspe Prince Edward Cape Breton Island Island New Brunswick Haine Atomaria ephippiata Atomaria fuscata Nova Atomaria wollastoni Scotia

Figure Ι3. Distribution of Atomaria ephippiata, Atomaria fuscata, and Atomaria wollastoni in Atlantic Canada.

NSMC); Wentworth Park, July 12, 1993, J. & T. Cook, car net (1, JCC); Westchester- Londonderry, August 22, 1992, S. & J. Peck, forest road, car net (12, JCC); Digby Co.: Brier Island: Western Light, June 24, 2003, J. Ogden & K. Goodwin, raised bog, pitfall trap (1, JOC); Guysborough Co.: Trafalgar, Liscomb Sanctuary, July 19, 1992, S. & J. Peck, car net (3, JCC); Halifax Co.: West Dover, September 7, 2003, C.G. Majka, salt marsh (4, CGMC); Queens Co.: Medway River, July 13, 1993, J. & T. Cook, car net (13, JCC); Shelburne Co.: Clyde River Rd, July 16, 1992, S. & J. Peck, forest, car net (1, JCC).

Atomaria ephippiata is newly recorded in Labrador, New Brunswick, insular Newfoundland, and Nova Scotia (Figs 13, 17). This Nearctic species has previously been recorded in Alberta, British Columbia, Colorado, Connecticut, Idaho, Indiana, Iowa, Maine, Manitoba, Massachusetts, New Hampshire, New York, Ontario, Oregon, Québec, Rhode Island, Washington, and Wisconsin (Blatchley 1910; Britton 1920; Leng 1920; Procter 1946; Hatch 1961; Oatman et al. 1964; Bousquet 1991; Downie and Arnett 1996; Schwert 1996; Chandler 2001; Jacobs et al. 2006; Sikes 2004). It has been reported on fungi and molds in litter and nests (LaBonte 1998). In Atlantic Canada it has been found in mixed forests, coniferous forests, along forest roads, in raised bogs, salt marshes, and pastures. Jacobs et al. (2006) and Hammond et al. (2001) both reported this species as a member of saproxylic beetle assemblages on Populus tremuloides Michx (Salicaceae) in Alberta.

Description: Head piceous; finely sparsely punctate. Pronotum piceous; distinctly widest at midpoint, narrowing to base and apex; flattened across basal margin; finely sparsely punctate, interspaces between punctures ̴ 2.0 times the diameter of punctures. Scutellum piceous. Elytra testaceus, slightly darker along suture, with a pominent piceous crossbar at approximately the 2/5 point of the elytra, slightly curved posterad and frequently extending across the suture; punctures slightly coarser and slightly denser than on pronotum; interspaces between punctures ̴ 1.5 times the diameter of puctures; elytral setae slightly longer than interspace distance and appressed (Fig. 4). Antennae: antenomere 1 swollen, wider and longer than 2; 3 almost the same length as 2; 4, 6, and 8 short and of similar length; 5 and 7 somewhat longer; antennal club somehwat indistinct and not clearly demarcated, antennomere 9 only slightly wider than 8; 9 and 10 quadrate, not transverse (Fig. 1.3). Body: width/length ratio, 0.46; length, 1.5–1.6 mm.