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.
Leptotyphlops phenops bakewelli, Smith, Proc. U. S. Natl. Mus., 93:445, October 29, 1943.
La Placita (4); La Salada; Ostula.
The five specimens from the coastal lowlands are from elevations of less than 150 meters; these were collected by Peters (1954:20); the specimen from La Salada is from an elevation of 580 meters in the Tepalcatepec Valley. Peters (loc. cit.) remarked that the rostral and the tip of the tail that were described as white by Oliver (1937:17) actually are sulphur-yellow in life.
Loxocemus bicolor Cope
Loxocemus bicolor Cope, Proc. Acad. Nat. Sci. Philadelphia, 13:77, June 30, 1861.—La Unión, El Salvador.
Loxocemus sumichrasti Bocourt, Ann. Sci. Nat., ser. 6, 4:1, 1876.—Tehuantepec, Oaxaca, México.
Apatzingán (6); La Orilla; Lombardia.