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We have

Sc complete, not angled as in typical Tephritidae
No subcostal or humeral break
R1 bare
Postocellars divergent (ruling out Lauxaniidae, among others)
Head not spherical (ruling out Sepsidae)
All tibiae with preapical dorsal bristles
No row of bristles on meron (ruling out Oestroidea)
No differentiated vibrissa (ruling out most or all Calyptratae)
Venation typical for Schizophora, without any unusual bulging cells (common in Tephritoidea) or bent or convergent M (as in Oestroidea or the -pezidae families).
Suture incomplete, not extending inside dorsocentrals (pointing towards acalyptrates)

I consulted three keys: Nearctic, Central America, and Marshall's worldwide key. I keep ending up around Dryomyzidae or Sciomyzidae, possibly Clusiidae. I don't like any of those answers.