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Big Fly - Atylotus calcar

Big Fly - Atylotus calcar
Saratoga Springs, Utah, USA
June 30, 2004
This critter flew into my garage today, and caused quite a stir. About 14mm from eyes to tail, I thought it was a bee at first. Capable of near-hover flight and very sharp turns. The proboscis on this fly is huge, it looks like a vaccuum hose. We have been swamped with little brown flies all Summer, this is the first one of this kind I've seen.

Note the forceps are not holding the fly. They're holding a piece of kleenex to give the fly something to grab to right itself. It kept flying into the side of the cup & flipping over, and was unable to right itself without help.

Images of this individual: tag all
Big Fly - Atylotus calcar Big Fly 2 - Atylotus calcar


Not Atylotus calcar?
Not Atylotus calcar?

Hybomitra pediontis (images 4527, 4528)
One of a few species that breeds in alkaline sloughs of the Prairie and Foothill Grassland region of western Canada and USA. Utah and S. Dakota are about as far south as it gets. I have collected larvae at the edges of these salt-encrusted sloughs in Alberta. The larvae don't appear to be able to tolerate fresh water! This species is recognizable by general colouration, size,and the short spur vein near the end of the wing. This spur vein can be seen at the top of the photo,it's the short vein that projects forward and ends in a membrane.

Horse Fly
It's some type of horse fly, I'm pretty sure... Tabanus sp. Watch out, they can bite!

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