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Erpertogomphus compositus
It is known from lotic, depositional habitats with fine sediments, including sandy rivers and streams.
North American species whose distribution extends from northwestern United States to northern Mexico.
Steve, thank you so much! I must have goofed when I posted this. We observed this on a BLM trail west of Redding, CA. Do you think it is still E. compositus?
For Oregon, E. compositus is really the only choice, but it has been found only the the eastern part of the state, not on the coast.