zio; Volcan Jorullo (5);
Ziracuaretiro; Zirimicuaro.

These lizards were referred to _Cnemidophorus sacki copei_ by Duellman
(1954b:12 and 1955:6); Duellman (1960a) described the subspecies
_zweifeli_ and assigned it to _Cnemidophorus sacki_. Zweifel (1961:98)
used the specific name C. _costatus_ for the whiptails on the
southwestern part of the Mexican Plateau (_C. c. occidentalis_). Since
_occidentalis_ and _zweifeli_ are conspecific, the combination _C.
costatus zweifeli_ is used here for the population inhabiting the
Tepalcatepec Valley.

This lizard is abundant in the Tepalcatepec Valley, where it lives in
open and dense scrub forest, usually at elevations of less than 1000
meters. Throughout the valley it is found in association with
_Cnemidophorus deppei infernalis_, and in the lower parts of the valley
it also is associated with _Cnemidophorus calidipes_. Observations made
in the dry season indicate that large adults are not active at that
time.

On the coastal lowlands and in the valleys in the Sierra de Coalcoman
_Cnemidophorus costatus zweifeli_ is replaced by _C. communis communis_.
To the east in the Balsas Basin _C. costatus zweifeli_ intergrades with
_C. costatus costatus_.

~Cnemidophorus deppei deppei~ Wiegmann

_Cnemidophorus deppei_ Wiegmann, Herpetologia Mexicana, p.
29, 1834.--Mexico. Type locality restricted to Tehuantepec,
Oaxaca, Mexico, by Smith and Taylor (1950b:179).

_Cnemidophorus deppei deppei_, Cope, Trans. Amer. Philos.
Soc., 17:31, 1892.

Salitre de Estopila; San Pedro Naranjestila.

This small species, which is extremely abundant on the coastal lowlands
of Guerrero, seems to be rare on the coast of Michoacan, where it has
been taken at elevations of 130 and 500 meters in open situations in
otherwise forested areas. Duellman and Wellman (1960:25) discussed these
specimens in relation to their subspecific assignment. They were
referred to _Cnemidophorus deppei lineatissimus_ by Peters (1954:18).

~Cnemidophorus deppei infernalis~ Duellman and Wellman

_Cnemidophorus deppei infernalis_ Duellman and Wellman,
Misc. Publ. Mus. Zool. Univ. Michigan, 111:32, February 10,
1960.--Mexcala, Guerrero, Mexico.

Acahuato; Apatzingan (227); Capirio (3); El Sabino; Jazmin;
La Playa (6); Lombardia (6); Nueva Italia (4); Rio Marquez,
10 km. S of Lombardia (6); Rio Marquez, 13 km. SE of Nueva
Italia (10); south of Tanc