This species, which seems to be related to _Geophis maculiferus_, is known only from the pine-oak forest in the vicinity of Dos Aguas (elevation 2100 meters) in the Sierra de Coalcomán. Aside from the five specimens comprising the type series, there are ten other specimens in the Museum of Zoology at the University of Michigan collected by Floyd L. Downs in July, 1960. Data from these specimens and those comprising the type series show that in this sample seven males have 146-153 (149.3) ventrals and 35-37 (36.0) caudals; eight females have 150-154 (152.4) ventrals and 29-34 (32.5) caudals. The largest specimen is a female with a body length of 344 mm. and a tail length of 53 mm. ~Geophis maculiferus~ Taylor _Geophis maculiferus_ Taylor, Univ. Kansas Sci. Bull., 27:119, December 30, 1941.--Near Cicio [_sic_] = Tzitzio, Michoacán, México. Tzitzio. The type and only known specimen of _Geophis maculiferus_ (UIMNH 25078) is a female having 140 ventrals and 30 caudals, dorsal scales in 15 rows, one postocular, and an anterior temporal. Only one other species in México has dorsal scales in 15 rows and has an anterior temporal; that species is _G. incomptus_, which differs from _G. maculiferus_ in having six or seven lower labials, instead of five, and in having the edges of the ventrals dark, instead of a uniformly cream-colored belly. The locality from which the specimen was obtained lies at an elevation of 1630 meters on the southern slope of the Cordillera Volcánica. At that elevation there is an interdigitation of arid tropical scrub forest and pine-oak forest; probably _Geophis maculiferus_ inhabits the pine-oak forest. ~Geophis nigrocinctus~ Duellman _Geophis nigrocinctus_ Duellman, Occ. Pap. Mus. Zool. Univ. Michigan, 605:1, May 29, 1959.--Dos Aguas, Michoacán, México. Dos Aguas (3). The three specimens comprising the type series of the species were found beneath logs and in a stump in pine-oak forest at an elevation of 2100 meters. A discussion of the variation in these specimens and of probable relationships of the species was given by Duellman (1959). Floyd Downs spent several days at Dos Aguas in July, 1960; although he found ten specimens of _Geophis incomptus_, no further specimens of _G. nigrocinctus_ were obtained. ~Geophis petersi~ Boulenger _Geophis petersii_ Boulenger, Catalogue Snakes... British Museum, 2:321, September 23, 1894.--Mexico City. Type locality restricted to Pátzcuaro, Michoacán, México, by Smith and Taylor (1950a:335). Cherán; Coalcomán; Morelia; Pátzcuaro (6).