Mayfly ID

Saw a mayfly I couldn't identify last night while sitting at the bar. Thought maybe you guys could help out.

Small mayfly, maybe about an 18 or possibly a 20.

Cream colored abdomen. 3 tails. Fairly clear wings with no mottling. Medium brown thorax.

Never seen anything like it, but due to its small size, its entirely possible I'd have never noticed one without either a heavy hatch or, as in this case, it landing on the side of my drink.

hahaha, you sure you weren't drinking absinthe??

Para. Mollis (little blue quill) male spinner.  size 20.
Many of these bugs in PA and they hatch in late May to early June.
 
The pics on troutnut show only the male dun.
 The abdomen on the male spinners are white to almost clear (referred to as hyalene)
 
http://www.troutnut.com/hatch/764/Mayfly-Paraleptophlebia-mollis-Blue-Quill
 

Hmmm, after checking out that link...I'm not sure...I'm leaning toward the Mollis now.

In any event...would either of those flies be of any concern to the fisherman? Or are they not significant enough to be worth imitation?

 The Caenis around here hatch in July and can get pretty darn awesome. But..... they're a #28.
 
We have a few streams up here that get late morning Mollis spinners and sometimes the fish key on them.
But, like Drake said, usually evenings get a better mix of other bug.
I carry few light males and dark females in #20.