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TaxonomyBrowse
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Species Exoprosopa caliptera

Bee fly - Exoprosopa caliptera Beefly. - Exoprosopa caliptera Bee Fly - Exoprosopa caliptera - male Bee Fly - Exoprosopa caliptera Exoprosopa caliptera Exoprosopa caliptera Bee Fly - Exoprosopa caliptera Exoprosopa dorcadion - Exoprosopa caliptera
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 Anthracinae
Tribe Exoprosopini
Genus Exoprosopa
Species caliptera (Exoprosopa caliptera)
Synonyms and other taxonomic changes
Anthrax caliptera Say 1823
Identification
Pattern of "chocolate" infuscation on wings is distinctive in its details and fairly consistent...see wing diagram here;
Anterior 3/5's or more of second tergite covered in short silvery-white pubescence, forming a band that's deeply notched or completely interrupted medially...see thumbnails below (and the 2nd sentence of Osten Saken's remarks here);
   
Short white medial streaks on tergites 3 to 6;
White dashes on posterior corners of tergite 3.
Range
From Evenhuis & Greathead(1):
Canada (British Columbia), USA (Arizona, Arkansas, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon, South Dakota, Washington), Mexico (Durango).
Remarks
Say's original 1823 description can be read here; Osten Saken's 1877 remarks can be read here.
See Also
Exoprosopa dorcadion is quite close in appearance to E. caliptera:
Both have a similar wing pattern, but the bulbous apical portion of the chocolate infuscation spills slighty beyond R2+3 in caliptera, whereas it is exactly bounded by vein R2+3 in dorcadion.
The differences in the patterns of white on the dorsum of the abdomen are often easier to see:
The most consistent distinction is that in dorcadion the white band on the second tergite is narrower (i.e. ≤ 1/2 tergite length) or absent, and is neither notched nor broken medially.
A less consistent difference is that dorcadion typically has lateral pairs of white dashes forming longitudinal lines on tergites 3 to 6 which converge distally, whereas caliptera typically has single medial streaks on tergites 4 to 6. (See Osten Saken's descriptions of caliptera and dorcadion.) But individuals of each species can vary towards one another in this last character, as seen below:

                 
           calpitera                     calpitera                                dorcadion                 dorcadion                 dorcadion
Internet References
Images from CalPhotos
Works Cited
1.World Catalog of Bee Flies (Diptera : Bombyliidae)
Neal L. Evenhuis. 1999. Backhuys Publishers, Leiden. 804 pp.