Specimen here is from the same population, time, and place as the male shown here and the female shown here.

Although it seems impossible to discern from the images here (even zoomed in)...under a dissecting microscope, with high magnification and bright illumination, the presence of three sets of spines on the fore-tibiae was unmistakable. Those three sets of tibial spines, together with the costa barely extending past the radius take this unequivocally to Dilophus tingi using the key in "The Bibionidae of California" by Elmo Hardy [1961] (available as a PDF here).

(The key also indicates the rostrum should be elongate, as it is the two companion images linked to above. While the rostrum doesn't appear to be elongated here, I'm presuming that's because it was broken off during the somewhat rough transport it experienced between when I collected it and when I photographed here and keyed it, months later.)