The drumming signals of 9 California stonefly species from 8 families are reported. Signal interval patterns of the individual interbeat, intragroup, and intergroup intervals are graphed and used to determine signal type (monophasic, varied beat-interval, diphasic, and grouped). Signals of Kathroperla takhoma Stark & Surdick are described for the first time. New signal characters and signals from additional locations are described for 8 species: Bolshecapnia maculata (Jewett), Calineuria californica (Banks), Doroneuria baumanni Stark & Gaufin, Megaleuctra complicata Claassen, Nemoura spiniloba Jewett, Oemopteryx vanduzeea (Claassen), Pteronarcys princeps Banks, and Sierraperla cora Needham & Smith.