|scientific name Opisthius richardsoni |
Confined to the banks of rivers and big brooks, with clay soil, often mixed with sand and gravel.
Adults of this species have been collected from May to October.
Similar to the genus Elaphrus, but with elytra larger in relation to forebody. Elytra each with four rows of flat, ocellate, almost circular depressions, separated by more or less pronounced, elevated, more shiny fields. Upper surface dull, usually with pronounced greenish or coppery lustre, mouthparts and legs more or less green. Length 8.5 to 11.0 mm.
Larvae develop during the summer and adults overwinter.
Both adults and larvae are predatory.
This species is found in western United States and Canada. In Alberta this species is found throughout most of the province.
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