Kwik-Key to Common Families of Diptera
Select "A" or "B" for your specimen:
A. Compound eyes meet (or nearly meet) in center of head. Stem of “M” vein about as long as its branches. Body and wings are smoky black in color.
B. Compound eyes do not meet. Stem of “M” vein is much shorter than its branches. Body is usually brown; wings are mostly transparent.
