20 + individuals (adults) found in restored grassland. Courtship observed. Healthy population at Horse Park Woodside (private). No diagnostic photo - sorry :(
10 + individuals and restored grassland. Courtship observed
Calathus ruficollis (Carabidae, ground beetle), Redwood City, San Mateo County, California - 27 November 2010. Thanks to v belov and Bug Guide for the species-level identification: bugguide.net/node/view/475550 Appears to be quite common in the Bay Area.