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Photo#751868
Red-headed fly

Red-headed fly
Arnold Arboretum, Boston, Suffolk County, Massachusetts, USA
March 17, 2013
Temp around 35F.

Moved
Moved from ID Request.

Fungus gnat
Fungus gnat. Some kinds overwinter under loose bark and can be found any time of year.

 
Are they the size of a small
Are they the size of a small housefly? This one was much larger than the fungus gnats I've seen on houseplants.

 
Size varies
The small, black ones that live in potted plants are typically 2-3 mm long. Mycetophila, a genus that overwinters in leaves and under bark, can be over 5 mm.

 
That's it!
Thanks, I found a photo that's a close match.

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