Dyschirius (Dyschiriodes) setosu
Geographic: NEA
Distribution: Native, New World. Canada – AB, BC, MB, NB, NS, ON, PE, PQ, SK; USA –
AK, CO, IA, ID, IL, MA, MD, ME, MI, MN, MT, ND, NE, NH, NJ, NM, NY, OK, RI, PA,
SD, UT, VT, WA, WI, WY.
Common name: Bristly Discolored Beetle
Synonyms: Dyschirius setosus LeConte, 1857:79
Dyschirius alternatus Hatch, 1949:117
Macrohabitat: Lowlands to midlands, sea level – 1358 meters altitude, on river
banks, margins of ponds and lakes, edges of pools (e.g., in sand and gravel pits), on roadsides
and in meadows. Microhabitat: Adults are ground-dwelling on exposed, moderately moist sandy or clayish substrate, bare or almost so. Dispersal abilities: Macropterous, capable of
flight. Seasonal occurrence: Adults have been found in April – October, and December;
teneral adults in May – July, and August – October; probably a spring breeder. Behavior:
Adults are mostly nocturnal, sometimes active in the sunshine, predaceous, and take cover
during the day in burrows they dig into the substrate. or under woody debris; they are gregarious.
Populations of this species are associated with staphylinids (Bledius ssp.). Adults found
occasionally in seashore drift material. Adults overwinter in the substrate.