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Info
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Subgenus Empidigeron

Bee fly? - Geron Bombyliidae - Bee Flies Geron calvus  - Geron calvus 6008184 Geron - Geron calvus - male - female Fly, Small, Sept - Geron - male Geron for Aaron #4 - Geron Geron for Aaron #6 - Geron Geron #1 - Geron - female Unknown Fly - Geron
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Superfamily Asiloidea
Family Bombyliidae (Bee Flies)
Subfamily Toxophorinae
Genus Geron
No Taxon Subgenus Empidigeron
Explanation of Names
Empidigeron Painter 1932
Numbers
6 spp., all in our area(1)
Identification
R5 approximately as long as the preceding segment of R4+5. (In subgenus Geron, R5 is two-thirds or less than the length of the preceding segment, R4+5).

The key in Painter (1932) (starting at couplet 21 on pg. 146) covers all six species listed for subgenus Empidigeron in the 2003 catalog of Evenhuis & Greathead(1). Descriptions of these six species appear on pp. 162-165 of Painter (1932).
Range
Nearctic group, restricted to the US; G. calvus is eastern (NH-VA), the rest are in sw. US (CA to CO-NM)(1)
   aequalis: CA
   aridus: AZ, CO, NM
   calvus: MD, MA, NH, NJ, NY, PA, VA
   hybus: CA
   nudus: CO, NM
   snowi: AZ, CO, NM
Print References
Painter, R. H. (1932). A Monographic Study of the Genus Geron Meigen as It Occurs in the United States (Diptera: Bombyliidae). Trans. Amer. Entomol. Soc. 58 (2): 139-168 (1st page at JSTOR)