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BugGuide is using the tribal names of Alexander, used in a large majority of literature on American crane flies. By the rules of nomenclature, a tribe or subfamily containing both Chionea and Erioptera should be called Chioneini or Chioneinae. That's because somebody thought Chionea was so unusual it deserved its own family group name early on in the history of nomenclature. Later it was discovered to be a heavily modified member of another group. (Michener points out the same problem in bees: Hemihalictus was so unusual it was named early, but it is just a member of a well known genus that happened to have lost a wing vein.)

I believe your fly is close to Erioptera based on what I can see of the wing veins and the large gap between mid and hind legs. Alexander called this group the "pot-bellied Eriopterini".