Calathus ruficollis is a species of ground beetle in the family Carabidae. It is found in western North America, covering the California Floristic Province and continuing to the Pacific Northwest. Calathus ruficollis is flightless, predaceous, and nocturnal.
Subspecies These four subspecies belong to the species Calathus ruficollis: Calathus ruficollis grandicollis Casey, 1920 Range: southwestern British Columbia to Humboldt County, California Calathus ruficollis guadalupensis Casey, 1897 Calathus ruficollis ignicollis Casey, 1920 Range: eastern Washington, western Idaho, south to central California (including Sierra Nevada) Calathus ruficollis ruficollis Dejean, 1828 Range: Mendocino County in California to Baja California and southern Arizona. Introduced in Hawaii.
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