Genus Hemerodromia

pdf file - way over my head - a technical paper that revises the Empidoidea. However, I thought that it might be useful for Bug Guide as there is an illustrated key to the families and some of the genera of these flies. All of the figures/illustrations are at the end of this paper after the references.

"...All morphological characters are extensively discussed and illustrated, including details of the
antennae, mouthparts, internal thoracic structures, wings, and male and female terminalia. In
addition, a key to families and unplaced genus groups of the Empidoidea is provided. Feeding

Includes links to keys for several families of flies. (This link is also listed under the Internet references in the order diptera, but it seemed worth repeating here.)

See especially the :
links by family and:
Genera of Flower (syrphid) Flies. This is quite extensive, and allows one to identify some distinctive syrphid genera easily.

A helpful source (keys to species of most groups and other info) developed by Ethan Bright (U. of Michigan Museum of Zoology and School of Natural Resources and Environment)