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Mountaintop Fly - Eristalis tenax

Mountaintop Fly - Eristalis tenax
Mt. Washington Summit, New Hampshire, USA
July 7, 2014
Many of these flies were acting like honeybees on the summit of the mountain. No bees were seen.

Apparently common
I was disappointed to find the supposedly unique fauna of Mount Washington had so many of this fly I could find in my own neighborhood. Among Syrphidae you may also find Parasyrphus tarsatus, an arctic species which reaches its southern limit in the Presidential Range, and some mainly boreal Sericomyia.

I have not seen any social bees in the alpine zone. I saw an Andrena in the Alpine Garden.

Moved from ID Request.

Note honeybee appearance, sinuous R4+5 vein, closed r1 cell, and two stripes of dark hair on the eyes - the last distinguishes between Eristalis (Eristalis) tenax and Eristalis (Eoseristalis).

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