Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Over 1800 closeup photos of more than 400 mayflies illustrate an encyclopedia of the life history of each species, written as a simple but thorough explanation for the fly angler.
http://www.troutnut.com/hatch/4/Insect-Ephemeroptera-Mayflies

[cite:72253]
...to cite on BG; awesome resource.

Impressive
Photo collection of this group.