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 Coalcomán _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.--México. Type locality restricted to Tehuantepec, Oaxaca, México, 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 Michoacán, 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, México. Acahuato; Apatzingán (227); Capirio (3); El Sabino; Jazmin; La Playa (6); Lombardia (6); Nueva Italia (4); Río Marquez, 10 km. S of Lombardia (6); Río Marquez, 13 km. SE of Nueva Italia (10); south of Tancítaro; Volcán Jorullo (3). This is one of the most abundant and widespread lizards in the Tepalcatepec Valley. Throughout its range it is ecologically associated with _Cnemidophorus costatus zweifeli_, which ranges to elevations somewhat higher than the 1050 meters known for _C. deppei infernalis_. This small lizard reaches its greatest abundance in grassy areas on the floor of the Tepalcatepec Valley, where in the _Cercidium-Prosopis-Apoplanesia_ associations it occurs with _Cnemidophorus calidipes_. Duellman and Wellman (1960) discussed the variation and relationships of _Cnemidophorus deppei_, of which the subspecies _infernalis_ is restricted to the Balsas-Tepalcatepec Basin. ~Cnemidophorus lineatissimus exoristus~ Duellman and Wellman _Cnemidophorus lineatissimus exoristus_ Duellman and Wellman, Misc. Publ. Mus. Zool. Univ. Michigan, 111:44, February 10, 1960.--Rancho Santa Ana, four kilometers northeast of San Salvador, Michoacán, México. Thirteen to 25 km. S of Arteaga (18); Capirio (19); Limoncito (13); Santa Ana (22).