Identification
Medium sized (12-18mm) with a convex almost cylindrical body. A dazzling species which is light black to black with slightly paler appendages. Upper surface with pronounced metallic lustre from violaceous to bright green. Coastal specimens average larger, are bright metallic, usually coppery, and more coarsely sculptured on head and prothorax. Specimens from east of the Cascades are dull violaceous and finely sculptured.
Range
Found in Western North America from southeastern Alaska, south to northern California, and east to southeastern British Columbia, northern Idaho, and northwestern Montana.
Natural History
Inhabits heavy coniferous forests under logs and needle duff during the day. Active at night in areas where needle duff is very deep and free of low plant cover. Adults are brachypterous and incapable of flight.
