Published online by Cambridge University Press: 31 May 2012
Herewith are described five new species of North American Plecoptera. Included also is a description of Isoperla petersoni Needham (nec Claassen). Dr. Needham published figures of the nymph and adult of this species, anticipating that I would publish a description of this species before the Utah bulletin appeared in print. In 1931 I described the nymphs of this species as my own. Under the rules of the International Code, however, I believe that this species should now stand as indicated in this paper.