Contribution to the taxonomy of Asioplax (Ephemeroptera: Leptohyphidae: Tricorythodinae) in the new world

North, Central, and South American species of the genus Asioplax (Leptohyphidae: Tricorythodinae) are comparatively reviewed and diagnosed. The male adult of A. dolani and male and female adults of A. edmundsi are described for the first time. Adults of A. texana are comparatively redescribed. Two South American species previously considered in Tricorythodes are newly transferred to Asioplax: A. santarita, n. comb, and A. zunigae, n. comb. Asioplax corpulenta is shown to be a junior subjective synonym of A. edmundsi, n. syn. Stage correlated identification keys to species, incorporating range characteristics, are provided.