...which one? I'm fairly convinced this is myrmeleontid, and not a "skinny dobsonfly" like I had originally thought. Scotoleon, Myrmeleon, and Brachynemurus all seem like options.

Observed at night in a mixed chaparral / grassland area in Oakland, CA, USA, along with many others. ~2-3 cm total body size.

Not a good pic but it seems like a distinct enough pattern that I should be able to identify it. Unfortunately, I see nothing that fits the bill.

Approximately 5cm long, it was on the underside of a bare rock outcropping on the cliff face.