Moved from Physocephala.

The single, black, medial "bar" on the anterior half of the dorsum of the thorax (and about 1/3 its width); the overall dark brick-red color; the 2:1 proportion of length-to-width of the scape (=basal joint of antenna); the hyaline discal cell; and the location here all point to P. burgessi. See the references on the info page for details.

Moved from Physoconops.

The keys in the MND(1) and Camras & Hurd(2) use the position of the cross vein r-m relative to the discal cell as the principal character for distinguishing the genera Physoconops and Physocephala. A second distinguishing character is the "irregular swelling" of the hind femora in Physocephala (vs. a more uniformly cylindrical shape for Physoconops). But the hind femora character is sometimes subtle and/or difficult to discern in photos.

See the labeled wing venation diagram from the MND(1) to clarify the discussion below.

In Physoconops cross vein r-m is near the middle of the discal cell, while in Physocephala r-m is well beyond middle of the discal cell. Note that the discal cell, dm, is often very long and narrow in its basal portion...its base is just a bit distal from where vein CuA2 meets vein CuA1 (cf. labelled wing diagram link above). So one might easily misjudge whether the position of the cross-vein r-m is near the middle of the discal cell or well beyond. The cross-vein r-m is at the anterior corner of the (hyaline in your specimen) discal cell, dm. Thus, in your specimen, it appears that the cross vein r-m is well beyond the middle of the discal cell...making this Physocephala rather than Physoconops.

Moved from Thick-headed Flies.

Moved from Pyrgotidae.