The largest specimen is a male having a snout-vent length of 136 mm. Two juveniles collected in July 24, 1960, have snout-vent lengths of 36 and 42 mm. A specimen having a snout-vent length of 127 mm. and a tail length of 145 mm. was regurgitated by a _Crotalus pusillus_, which had a body length of 550 mm. _Gerrhonotus imbricatus imbricatus_ is an inhabitant of coniferous forests. In the Cordillera Volcánica it occurs from 1500 to 3500 meters at the top of Cerro Tancítaro. In the Sierra de Coalcomán it occurs from 2100 to 2700 meters. On July 4, 1955, a pair was found in copulation beneath a pine log at 2700 meters on Cerro Barolosa. The male was lying on top of the female and was holding her head firmly in his jaws; the male's tail was curled under the female's tail, so that the cloacae were in contact. Serpentes ~Typhlops braminus~ (Daudin) _Eryx braminus_ Daudin, Hist.... des reptiles, 7:279, 1803.--Vazagapatam, India. _Typhlops braminus_, Cuvier, Règne animal, ed. 2, 2:73, 1829. Apatzingán; Arteaga. Both specimens known from Michoacán were collected by Gadow in 1908. Peters (1954:20) remarked that the specimen from Arteaga probably does not indicate a rapid spreading of the species, which most likely was introduced into México at the time that vessels were stopping at Acapulco from the Philippines (Taylor, 1940b:444), but instead may indicate that pack trains from Acapulco passed through the Sierra de Coalcomán. The occurrence of this snake along a long-used _camino_ substantiates this belief. ~Leptotyphlops bressoni~ Taylor _Leptotyphlops bressoni_ Taylor, Copeia, No. 1:5, March 9, 1939.--Hacienda El Sabino, Michoacán, México. El Sabino. This species still is known definitely only from the type specimen collected on the lower slopes of the Cordillera Volcánica at the northern edge of the Tepalcatepec Valley. A specimen (now lost) reported from Aguililla by Cope (1887:63) possibly represents this species (see Smith and Taylor, 1945:21, and Peters, 1954:20). ~Leptotyphlops gadowi~ Duellman _Leptotyphlops gadowi_ Duellman, Copeia, No. 2:93, May 29, 1956.--Apatzingán, Michoacán, México. Apatzingán. No additional specimens of this species have been collected since the species was described by Duellman (1956b:93). Data given with the specimen by Gadow indicate that it came from his camp above Apatzingán at an elevation of about 800 meters. Although the exact position of this camp is unknown, the lower slopes of the Cordillera Volcánica above Apatzingán usually support arid scrub forest at elevations below 1000 meters. Therefore, this species probably is an inhabitant of the arid scrub forest. ~Leptotyphlops phenops bakewelli~ Oliver _Leptotyphlops bakewelli_ Oliver, Occ. Pap. Mus. Zool. Univ. Michigan, 360:16, November 20, 1937.--Paso del Río, Colima, México.