The one specimen available from Michoacán of this apparently rare species was discussed by Wellman (1959:127), who pointed out that although the specimen was geographically intermediate between the subspecies _C. l. lateritius_ (Jalisco and Nayarit) and _C. l. melanocephalus_ (Morelos and Puebla), the specimen (UMMZ 118954) was like _C. l. lateritius_ in scutellation and in color pattern differed from other known specimens of the species in having had in life a pale orange, instead of a brick-red, dorsum. Additional specimens from the Sierra de Coalcomán will be required in order to determine whether this specimen is a representative of an orange-colored population or merely is aberrant in coloration. The present specimen is from an elevation of 900 meters in oak forest on the southern slopes of the Sierra de Coalcomán; other locality records for the species indicate that it inhabits broad-leafed forest in foothills from Nayarit to Puebla. ~Conophis vittatus vittatus~ Peters _Conophis vittatus_ Peters, Monats. Akad. Wiss. Berlin, p. 519, 1860.--No type locality given. Type locality restricted to Laguna Coyuca, Guerrero, México, by Smith and Taylor (1950a:331). _Conophis vittatus vittatus_, Smith, Jour. Washington Acad. Sci., 31:119, March 17, 1941. Arteaga; Coalcomán (4); La Playa; 19 km. S of Tzitzio. All specimens of this terrestrial snake have been collected in areas of scrub forest between 800 and 1100 meters above sea level. Since the species is known from the coastal regions of Guerrero and Colima, its absence from the cost of Michoacán is unexplainable; probably the lack of specimens from these areas is due solely to inadequate collecting. ~Conopsis biserialis~ Taylor and Smith _Conopsis biserialis_ Taylor and Smith, Univ. Kansas Sci. Bull., 28 (2):333, November 12, 1942.--Ten miles west of Villa Victoria, México, México. Capácuaro (5); Cerro San Andrés; Cherán; Ciudad Hidalgo; Macho de Agua (4): Pátzcuaro (8); Tancítaro (24); Uruapan (9); 24 km. SE of Zitácuaro (14). This species is abundant in the coniferous forests at elevations from 1550 to 2800 meters throughout the Cordillera Volcánica; apparently it does not occur in the Sierra de Coalcomán. On August 1, 1956, a copulating pair was found beneath a rock at Capácuaro. One of the best characters to distinguish this species from _Toluca lineata_, which occurs with _Conopsis_ throughout its range in Michoacán, is the presence of large, black ventral blotches in _Conopsis biserialis_, as contrasted with the two rows of small black spots in _Toluca lineata_. ~Conopsis nasus~ Günther _Conopsis nasus_ Günther, Catalogue... snakes... British Museum, p. 6, 1858.--California (in error). Type locality restricted to Guanajuato, Guanajuato, México, by Smith and Taylor (1950a:330).