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Steven,
I was just trying to help identify the bug for the guy. My first guess was a March Brown. Then, he posted the second pic. Which mentioned a lake as the source....another clue.
So, we had:...

It was from a lake and the calibaetis like lakes. Although less pronounced from one picture, the Calibaetis does have hind wings.

Could also be a female Calibaetis:


http://i1101.photobucket.com/albums/g430/byhaugh/imagejpg1_zpsa21c234a.jpg

I now you did not solicit a pattern, but I think one of these might do?


http://i1101.photobucket.com/albums/g430/byhaugh/IMG_5707_zpseaa3176d.jpg

...

Looks like a March Brown to me. The duns have two tails, unlike most other mayflies.

The scientific name, if I am correct (hard to be sure without measuring and knowing emergence), it might be...