Robert Nash wrote:
These are very difficult flies to identify without specimens (and sometimes with them, preferably pinned) but to add to Kahis? characters

in Fanniidae- the head is hemispherical ; the arista bare; the middle tibia in the males of some species have a strange structure which may look like deformity. In others bent spurs or thorns point down from the mid coxae. Females are more difficult but there are two strong (big) upper fronto-orbitals outside the row of frontals.