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Redescription and Lectotype Designation of Tylenchorhynchus cylindricus Cobb, 1913.

Tylenchorhynchus cylindricus is redescribed and illustrated from N. A. Cobb's original specimens collected in 1910. In 1955 M. W. Allen established a neotype from specimens collected near Cathedral City, California. Recently Cobb's original sketches, line drawings, and balsam slides were rediscovered and examined. The specimens collected by Cobb were compared with the neotype established by Allen and with other collections of nominal T. cylindricus. Differences in morphology of the Cathedral City (Allen) and Los Patos (Cobb) populations were observed. Collections of males and females from Cathedral City, California; Mosida, Utah; and Kings County, California; were similar to each other except for some variation in female tail shape. Females in Cobb's collection and in a collection from a beach near Ensenada, Mexico, were similar to each other but differed morphologically from other collections. We consider all collections to represent a range of variation within the species. A lectotype and an allolectotype were selected to establish the taxonomic base for the genus. A ruling has been requested from the International Commission of Zoological Nomenclature on the disposition of the neotype.