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Old 12-29-2000, 09:05 PM
John Desjardins John Desjardins is offline
Join Date: Feb 2000
Location: Central MA
Posts: 1,839

Checking the books shows that there are 2 mayflies that are called March Browns. Both belong to the same family, have similar behaviors and frequent the same water types but are of different genera & species.

The American March Brown (Stenoma vicarium) is the eastern variety, while the western variety is the Western March Brown (Rhithrogena morrisoni). From the info I have on them the major difference is in size. Adult American March Brown's are ~ 12-15 mm while the Western March Browns are ~ 8-12 mm. This info is from "An Anglers Guide to Aquatic Insects and Their Imitations" by Rick Hafele & Scott Roederer.

I agree with Greg on the small stoneflies being the first bugs out in the spring on the moving water.
John Desjardins
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