In September, 1958, the author and two colleagues collected a large series of Pseudemys in small ponds and in a river in the basin of Cuatro Ciénegas, Coahuila. The specimens prove to represent a previously unrecognized subspecies of Pseudemys scripta . The subspecies is named in honor of Edward Harrison Taylor who has contributed more than any other person to our present knowledge of the herpetofauna of México. Pseudemys scripta taylori new subspecies (Pls. 9-12, Figures 1 & 2) Holotype

Description of holotype (measurements given in Table 1).—Carapace oval in dorsal aspect, slightly narrowed behind, nearly straight across anterior margin, bluntly serrate behind; shell deep, highly arched in cross section; height of shell 53 per cent of width; surface of shell having longitudinal striations; middorsal keel weakly developed, scarcely discernible except on third central lamina; lateral margin of carapace not at all reflected, posterolateral margins flared outward; central laminae

Carr , A. 1952. Handbook of turtles: the turtles of the United States, Canada, and Baja California. Cornell Univ. Press, xv+542 pp., 82 pls., 37 figs., 15 tables, 23 maps. Gilmore , R. M. 1947. Report on a collection of mammalian bones from archeologic cave-sites in Coahuila, Mexico. Journ. Mammalogy, 28(2):147-165, 1 pl., 2 figs., 1 table. Günther , A. 1885. Biologia Centrali-Americana. Reptilia and Batrachia. Chelonia, pp. 1-18. Hamilton , R. D. 1947. The range of Pseudemys scripta gaigeae . C