LITERATURE CITED

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_. Copeia,

1947(1):65-66.

HARTWEG, N.

1939. A new American _Pseudemys_. Occas. Papers Mus. Zool.

Univ. Michigan, no. 397, 4 pp.

LEGLER, J. M.

1960. Natural history of the ornate box turtle, _Terrapene

ornata ornata_ Agassiz. Univ. Kansas Publ., Mus. Nat.

Hist., 11(10):527-669, pls. 15-30, 29 figs.

SCHMIDT, K. P., and OWENS, D. W.

1944. Amphibians and reptiles of northern Coahuila, Mexico.

Zool. Ser., Field Mus. Nat. Hist., 29(6):97-115.

SHANNON, F. A., and SMITH, H. M.

1949. Herpetological results of the University of Illinois

field expedition, spring 1949. I. Introduction,

Testudines, Serpentes. Trans. Kansas Acad. Sci.,

52(4):494-509.

WEBB, R. G., and LEGLER, J. M.

1960. A new softshell turtle (genus _Trionyx_) from Coahuila,

Mexico. Univ. Kansas Sci. Bull., 40(2):21-30, 2 pls.,

April 20.

WILLIAMS, E.

1956. _Pseudemys scripta callirostris_ from Venezuela with a

general survey of the scripta series. Bull. Mus. Comp.

Zool., 115(5):145-160, Pls. I-III, 4 figs.

_Department of Zoology and Entomology, University of Utah,

Salt Lake City, Utah, Transmitted May 23 1960._

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