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Tabanid? - Hybomitra - male

Tabanid? - Hybomitra - Male
~3800m, Rocky Mountain National Park, Larimer County, Colorado, USA
July 19, 2005
Looking at wing venation I think this is a Horse Fly (Tabanidae), on Polygonum bistortoides (American Bistort).

Hybomitra male
This is one of the black Hybomitras found in western montane North America. From the very shiny thorax, it could be Hybomitra osburni, which is a very common species in western North America, esp. in the Rocky Mountain area, but there are other black species as well and would need to see details of the antennae and abdomen

Alas, this will have to wait until I'm in the Rockies.

the first character that I noticed and indicated to me that it was a tabanid was the shape of the head. It's a male Hybomitra but I doubt that it can be identified any further - need to see dorsal body and more details on head.
Looks as though it's actually feeding on the flowers.
Moved to genus page

Thank you, Tony!
The big google eyes did catch my attention but I didn't know that they are a diagnostic character.

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