Conservation Status
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Relatively rare.
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Cyclicity
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Adults of this species have been collected in July and August.
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Distribution
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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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General Description
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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.
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Habitat
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Confined to stony-gravelly margins of fast-running waters, usually rather small brooks.
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Life Cycle
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Overwintering occurs in the larval stage, with numerous immature beetle seen late in July and early August.
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Trophic Strategy
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Both larvae and adults are predatory.
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