Ten species of the heptagenine mayfly genus Cinygmula are recognized in North America. Two of these species were originally described from Colorado, C. mimus (Eaton) and C. ramaleyi (Dodds). Additionally, C. par (Eaton) and C. tarda (McDunnough) have been reported from the state. The purpose of this paper is to provide comparable descriptions of the adult males of the four species known from Colorado, providing illustrations of the male penes.
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Vol. 77 • No. 2