Found resting on flower of a non-native "ice plant" (Caprobrotus edulis) growing among native coastal scrub along bluffs above the ocean.

This keys unequivocally to genus Thecophora in the MND(1) via these characters:
    1) Arista placed dorsally;
    2) Wing with (anal) cell cup longer than cell bm (see 2nd image), and female having 5th sternite with pad-like process (i.e. a theca, somewhat hard
        to make out in the image above, as it appears to blend in with the base of the fly's left hind femur);
    3) Proboscis doubly bent, once near base and once near middle (see 3rd image); and
    4) Gena usually less than half as high as vertical diameter of eye. Species usually black.

It keys to species Occemyia (=Thecophora) loraria in Camras & Hurd(2), based on the hind femur being yellow on slightly more than the basal third and its small size (note that it's perched on a petal of the Carpobrotus flower, and they are quite narrow). But due to variation among the taxa as discussed in Camras & Hurd, this might also be Occemyia (=Thecophora) nigripes. Camras & Hurd comment that the two species can be difficult to separate, and the slightly more detailed discussion in 1945 revision of Occemyia by Camras didn't clarify the issue. In fact, both references seem to indicate that a number of the 8 species they treat in the genus may not actually be distinct.