|scientific name Nebria arkansana edwardsi |
Confined to stony-gravelly margins of fast-running waters, usually rather small brooks.
Adults of this species have been collected in July and August.
Member of the gregaria group, characterized by: prothorax without marginal setae, sides with well defined reflexion, hind angles right or acute; meta-coxae and sternites 3-5 plurisetose. Black or dark piceous, elytra with more or less pronounced violaceous lustre (sometimes rufinistic), appendages sometimes paler, brownish, but the femora always dark. Length 8.5 to 10.8 mm.
Overwintering occurs in the larval stage, with numerous immature beetle seen late in July and early August.
Both larvae and adults are predatory.
This subspecies is found in the northwestern United States and western Canada. In Alberta this subspecies is found in the Rocky Mountains.
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