obatrachylus minimus_ Taylor, 1940, and _Microbatrachylus imitator_
Taylor, 1942, as synonyms of _Microbatrachylus pygmaeus_ (Taylor), 1937.
_Phrynohyas corasterias_ Shannon and Humphrey, 1957, as a synonym of
_Phrynohyas inflata_ (Taylor), 1944. _Hyla microeximia_ Maslin, 1957, as
a synonym of _Hyla eximia_ Baird, 1854. _Hylella azteca_ Taylor, 1943,
as a synonym of _Hyla smaragdina_ Taylor, 1940. _Loxocemus sumichrasti_
Bocourt, 1876, as a synonym of _Loxocemus bicolor_ Cope, 1861.
_Eleutherodactylus vocalis_ Taylor, 1940, is considered to be a
subspecies of _Eleutherodactylus rugulosus_. The populations of
_Thamnophis dorsalis_ in the Tepalcatepec Valley are shown to be
distinct from those inhabiting the highlands of the state; _Thamnophis
dorsalis postremus_ Smith, 1942, is revived for the population in the
Tepalcatepec Valley.

Descriptions are given of the tadpoles of _Bufo occidentalis_ and _Hyla
bistincta_.

LITERATURE CITED

ANDERSON, J. D.

1960. _Storeria storerioides_ in western Mexico. Herpetologica, 16:63-6,
March 31.

BOGERT, C. M., and OLIVER, J. A.

1945. A preliminary analysis of the herpetofauna of Sonora. Bull. Amer.
Mus. Nat. Hist., 83:297-426, March 30.

BOULENGER, G. A.

1885. Catalogue of the lizards in the British Museum, vol. II. London,
xiii + 497 pp., November 15.

1894. Catalogue of the snakes in the British Museum, vol. II, London, xi
+ 382 pp., September 23.

CONANT, R.

1953. Three new water snakes of the genus _Natrix_ from Mexico. Nat.
Hist. Misc., 126:1-9, September 15.

CONTRERAS ARIAS, A.

1942. Mapa de las provincias climatologicas de la Republica Mexicana.
Dir. Meteoro, Hidro. Inst. Geog. Mexico, xxvii + 54 pp.

COPE, E. D.

1861. Contributions to the ophidiology of Lower California, Mexico, and
Central America. Proc. Acad. Nat. Sci. Philadelphia, 13:292-306,
December 28.

1887. Catalogue of batrachians and reptiles of Central America and
Mexico. Bull. U. S. Natl. Mus., 32:1-98.

DAVIS, W. B.

1954. Three new anoles from Mexico. Herpetologica, 10:1-6, April 20.

DAVIS, W. B., and DIXON, J. R.

1957. Notes on Mexican snakes (Ophidia). Southwest. Nat., 2:19-27,
January.

DAVIS, W. B., and SMITH, H. M.

1953. Lizards and turtles of the Mexican state of Morelos.
Herpetologica. 9:100-108, July 22.

DIXON, J. R.

1957. Geographic variation and distribution of the genus _Tomodactylus_
in Mexico. Texas Jour. Sci., 9:379-409, Dec