The five species of Cybocephalidae in America north of Mexico are revised. Included are redescriptions of Cybocephalus californicus Horn, Cybocephalus nigritulus LeConte, and Cybocephalus nipponicus Endrödy-Younga and descriptions of two new species, Cybocephalus kathrynae and Cybocephalus randalli. A key to species, illustrations of morphological features, including detailed drawings of male genitalia, distribution data, and host lists are provided. The confusion involving Cybocephalus nipponicus and Cybocephalus binotatus Grouvelle is discussed and the differences between them are made evident.