Dromius piceus Dejean, 1831

Bousquet, Yves, 2012, Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico, ZooKeys 245, pp. 1-1722 : 805

Dromius piceus Dejean, 1831

Dromius piceus Dejean, 1831: 353. Type locality: «Amérique septentrionale" (original citation), restricted to "Bethel [Oxford County], Maine" by Lindroth (1969a: 1041). Holotype [by monotypy] in MHNP (Lindroth 1955b: 24).

Dromius quadricollis LeConte, 1859a: 82. Type locality: "Puget Sound [Washington]" (original citation). One syntype in MCZ [# 5812]. Synonymy established by Horn (1882: 160).

Distribution.

The range of this species extends from Cape Breton Island (Bousquet 1987d: 107) to Vancouver Island (Lindroth 1969a: 1043), south to southern California (Fall 1901a: 48; MCZ), the states of Sonora (CNC) and Durango (CNC) in Mexico, and the Florida Panhandle (Peck and Thomas 1998: 24). Fossil remnants, undated but believed to be younger than 3 million years B.P., have been unearthed in northwestern Yukon Territory (Elias and Matthews 2002: 914).

Records.

CAN: AB, BC (VCI), MB, NB, NS (CBI), ON, PE, QC, SK USA: AL, AR, AZ, CA, CO, CT, DC, FL, GA, IA, IL, IN, KY, LA, MA, MD, ME, MI, MN, MS, MT, NC, NE, NH, NJ, NM, NY, OH, OR, PA, RI, SC, SD, TN, TX, VA, VT, WA, WI, WV, WY - Mexico

Note.

Lindroth (1969a: 1042-1043) studied superficially the structural variation in this species and concluded there was a single species but that the specimens west of the Rockies "may very well be treated" as a subspecies for which the name Dromius quadricollis LeConte, 1859 is available. Until a detailed study of the variation is done, I prefer not to recognize subspecies for this taxon.