Dyschirius (Eudyschirius) varidens
Geographic: NEA
Distribution: Native, New World. Canada – AB; USA – CA, ID, MT, NV, OR, WA, WY.
Common name: Fall’s Discolored Beetle
Synonym: Dyschirius varidens Fall, 1910:93
Macrohabitat: Lowlands to mountains, sea level – 2743 meters altitude, on
banks of rivers and brooks, shores of lakes, and margins of springs in Redwood/Douglas Fir
forests (Sequoia sempervirens (D. Don) Endl. and Pseudotsuga menziesii (Mirb.) Franco). Microhabitat:
Adults are ground-dwelling on exposed or shaded moist, sandy substrate, bare or
with sparse vegetation. Dispersal abilities: Macropterous, probably capable of flight; slow
runners, strong burrowers. Seasonal occurrence: Adults have been found in February –
November. Behavior: Adults are nocturnal, predaceous, and take cover during the day in burrows
they dig into the substrate, they are gregarious. Populations of this species are associated
with staphylinids (Bledius ssp.). Adults overwinter in the substrate.