I justed received and tried out new extension tubes on bugs at Silver Creek a couple days ago.  That essentially allows me to get much closer and as a result get a greater magnification.  Mayflies that I saw were: Baetis, Mahogany Duns, Tricos & Callibaetis.  Mahoganies and Baetis were the only mayflies I saw in great numbers.  October caddis are also fluttering around Silver Creek at the moment.

 

Female Trico

 

Female Mahogany Dun

 

Mahogany Dun

 

Mahogany Dun Tail

 

Callibaetis