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The way the anal vein reaches the wing margin indicates family Anthomyiidae - tricky to get to genus even when you have the specimen.
Possibly Phorbia species? The main reliable features to separate genera are the male genitalia. Keys to genera based on external characters are very difficult to write, and to use. The fifth sternite in the male could be considered and external character but is rarely visible in a whole fly photo, but will often tell you the genus. You need my manuscript keys etc but one has to be a member of the Dipterists Forum, not a registered user.
The reason why I suggest Phorbia is because the abdomen is robust, cylindrical, and the profrons on the head is projecting beyond the level of the mouth margin. These characters can be found in a few other genera. Phorbia species also occur early in the year also, although some species have a second generation.
Thanks Michael, I am hoping to learn dissection as soon as possible but unfortunately I don't think that will be too soon. I will also hopefully be a member of Dipterists' Forum soon and therefore able to use the keys.