Anthomyia illocata ♂.
 
 
 
Size: approx. 5 mm. Photo: 04/28/18, 11 am.


This root-maggot fly was introduced from Asia not too long ago, possibly to Florida. While it looks similar to a common small housefly, it has a nearly uniformly broad transverse stripe. 
 
 
bug guide (this photo):
https://bugguide.net/node/view/1513762