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Photo#57674
Bloated Fly

Bloated Fly
Madison, Dane County, Wisconsin, USA
June 13, 2006
I've found dozens of flies with bloated abdomens clinging with a rigor mortis-like grip (they don't blow off in the wind). Most were found at the top of grass stalks, though some were at the tips of leaves, as seen here. I seem to recall a fungus that attacks ants' brains causing them to seek high ground. I wouldn't be surprised if a similar fungus afflicts flies. Any thoughts?

Probably Anthomyiidae
Probably Anthomyiidae

Fungal fly
You're right, it's a fungal disease.

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