I photographed at least two individuals of Lepidanthrax visiting these flowers of Chorizanthe diffusa on this summer morning. Another individual appears in the post below:



...and Geminaria canalis was also seen on these flowers.

Using the Bombyliidae key in the MND(1) I originally erred in keying this to genus Paravilla (not noticing the long proboscis here, and getting derailed at couplet 54). Thankfully, Joel Kits noted my error and saw this was Lepidanthrax. The corrected couplet sequence from the MND(1) for keying to genus here appears below:

 1) Hind margin of eye sharply and deeply indented....38
38) R2+3, arising from R4+5, near crossvein r-m, and at a right angle.....45
45) First flagellomere with an apical stylus (and without an apical tuft of hair)......47
47) Stylus not distinctly articulated with first flagellomere......49
49) Veins CuA2 and A ending separately in wing margin.......50
50) R2+3 bent apically but not strongly contorted, not connected to R4 by a crossvein.....53
53) Veins CuA2 and A converging toward wing margin...........54
54) Proboscis strongly projecting beyond subcranial margin.....55
55) R2+3, and R4 not connected by a crossvein (Fig. 44).....56
56) At least basal half of abdomen with broad scales; male usually with apex of abdomen silvery. Fore tibia with rows of short bristles. Crossvein dm-cu not much longer than middle portion of CuA, (Fig. 44)........Lepidanthrax

The characters at couplets 45 and 47 are not clearly visible in my photos here, but the alternatives they lead to can be eliminated further along in the key by noting various characters conflicts that arise.