It's hard to see the critical characteristic of subfamily Ectyphinae here: i.e. "hind basitarsus 5 or more times as long as wide" for Ectyphinae vs. "around 3 times as long as wide" for all our other mydid subfamilies [see key in Papavero & Wilcox(1)(1971)].

But from what I could interpolate from your photo that character seems to hold...and the overall black and red color pattern, location, and other characters (together with consideration of the known taxa in, and not in, your area) make it pretty clear this is Heteromydas bicolor. Compare with the curated photos of H. bicolor here and here from Torsten Dikow's web site.

You're near the northern end of the recorded range for this CA endemic, which is known from collections in the eastern Sierra: at Tom's Place; west of Lone Pine; west of Walker Pass; the Tehachapi Mnts; and also in the San Gabriel and San Bernardino Mnts down to Palm Springs, Indio, and Pinyon Flats in the northern Santa Rosa Mnts. Torsten Dikow provides a map of collection records.

Moved from Mydas Flies.

Moved from ID Request.