ID this Bug

[salmo]

This picture is from a Facebook group called Pennsylvania brookie chasers. It’s from Pa in the last couple of weeks. I guessed Sulfur but another member noticed the 2 tails. The only thing that I know about entomology is that I’m glad I skipped that course in college.

 

[FisherOfMen]

Pink Cahill

But I could easily be wrong

A big generic Yellow Mayfly pattern would catch most fish feeding on it.