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Photo#23661
Eristalis  stipator (Syrphidae) in the Colorado Rockies. - Eristalis stipator

Eristalis stipator (Syrphidae) in the Colorado Rockies. - Eristalis stipator
Barr Trail, Pikes Peak, at 14,000 ft, El Paso County, Colorado, USA
July 25, 2003
Size: L = 12 mm
At 14,000 ft only flies (Diptera) were visiting flowers, mostly Tachinidae, no bees.

This is not the same specimen as the other two.
(Note dates.) It should be unlinked.

Synonym
Eristalis latifrons = Eristalis (Eoseristalis) stipator

vs. dimidiatus
What field marks could be used to separate latifrons from the similar E. dimidiatus? (both are shown at Cedar Creek). And would those characters apply to both sexes, or would there be additional/separate field marks for females such as this one?

 
Eristalis latifrons
I follow a paper by Carol Ann Kearns: Anthophilous Fly Distribution Across an Elevation Gradient (Am.Midland Naturalist 127:172-182, 1992) who lists flies in the Colorado Rockies (Table 3). E.latifrons is found at medium and high elevations (montane-alpine). E.dimiatus is not listed by her and may have a different range.

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