Duellman (1960b) showed that the widespread species Pituophis deppei was composite and that the "lined subspecies" actually represented another species, Pituophis lineaticollis. Pituophis deppei occurs only on the Mexican Plateau; in Michoacán it inhabits mesquite grassland and oak-bunch grass associations between 1900 and 2200 meters.
Pituophis lineaticollis lineaticollis (Cope)
Arizona lineaticollis Cope, Proc. Acad. Nat. Sci. Philadelphia, 13:300, December 28, 1861.—Southern Mexican Plateau. Type locality restricted to 24 kilometers northwest of Oaxaca, Oaxaca, México, by Duellman (1960b:607).
Pituophis lineaticollis lineaticollis, Duellman, Univ. Kansas Publ. Mus. Nat. Hist., 10:607, May 2, 1960.
Acuaro de las Lleguas; Dos Aguas (3); Morelia; Tancítaro (5).
This species reaches the northern limits of its range in the Sierra de Coalcomán and on the Mexican Plateau in Michoacán. On the plateau it has been collected in mesquite grassland at elevations between 1500 and 2000 meters. In the Sierra de Coalcomán individuals were found in open pine-oak forest at 2100 meters elevation and in a meadow surrounded by pine-oak forest at 2300 meters.
Pseudoficimia frontalis (Cope)
Toluca frontalis Cope, Proc. Acad. Nat. Sci. Philadelphia, 16:167, September 30, 1864.—Colima, Colima, México.
Pseudoficimia frontalis, Günther, Biologia Centrali-Americana, Reptilia, p. 96, May, 1893.
Apatzingán; Coalcomán (6); El Sabino (2).