Conservation Status
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Common.
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Cyclicity
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This species has been collected from May to July.
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Distribution
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This species is found throughout United States and Canada. In Alberta this species is found in the southern one third.
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General Description
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Member of the politus group, with reduced number of dorsal punctures, 1-2, on the 3rd elytral interval, and the two teeth on the lateral margin of the protibiae rudimentary. Black, usually with rather strong metallic lustre; antennae piceous or yellowish brown with at least 1st segment and base of 2nd to 3rd following pale reddish (often several basal segment entirely pale); legs reddish, tibiae palest, femora darkened. Anterior margin of clypeus usually clearly bisinuate. Elytron with 1 subhumeral fovea and 2 preapical punctures. Length 4.2-5.2 mm
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Habitat
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Occurs on barren banks and shores of running and standing fresh water.
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Trophic Strategy
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Both larvae and adults are predatory.
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