700’ elevation, rural residential area with livestock, 38.8198, -121.1173.
Taken from UV 20 watt light bucket trap set out continuously for 5 nights.

In American Beetles (1) keys to Tanystoma. In LINDROTH (2) keys to Agonum. I tried the Agonum key (3) with little success. I don't see a key to the 5 Tanystoma species and they are all in CA I think.

- Tarsomeres of hind tarsus without dorsal median furrow (no picture).
- Last tarsal segment with two parallel rows of long setae underneath.
- Head without costriction posteriad of eyes and no evident transverse impression.
- Elytra with more than 3 discal setae.
- Apex of antennomere 2 with 4 or more setae.
- Mentum with a large tooth.

Hope I got it to the right genus and somebody can supply the species name without genitalia examination.
PS, getting ready to take the ventral view, the specimen had an accident and lost it's right tarsus, it isn't a different specimen. Luckily it doesn't need a crutch.