http://flyfishcalgary.com/board/lofiversion/index.php?f26.html Good photo’s and discussion forumn on flyfisher’s insects. Information is informative and legit entomologist visit the site to comment and identify insects in photo’s. Above photo is mine from East Lake (Callibaetis) Bottom photo is Gray Drake from FFCalgary site. see also:

https://swittersb.wordpress.com/2008/03/21/siphlonurus-grey-drake-nymph-callibaetis-nymph-similarities/