_Thamnophis eques eques_, Smith, Copeia, no. 2:139, June 8, 1951. Jiquilpan; Lago de Cuitzeo; Lago de Pátzcuaro (17); Pátzcuaro (5); Tangancícuaro; Tupátaro (2); Undameo; Zacapu. Although this snake has been collected in open pine-oak forest and in oak-bunch grass associations, it seems to reach its greatest abundance in marshes on the Mexican Plateau at elevations of 1550 to 2300 meters. ~Thamnophis melanogaster canescens~ Smith _Thamnophis melanogaster canescens_ Smith, Zoologica, 27:117, October 23, 1942.--Chapala, Jalisco, México. Lago de Cuitzeo (5); Lago de Pátzcuaro; Pátzcuaro; Tacícuaro; Tangamandapio (2). This species of garter snake seems to be most abundant in the marshes adjacent to the lakes on the Mexican Plateau in Michoacán and Jalisco. At these elevations (1550 to 2200 meters) it often is found in association with _Thamnophis eques eques_ and sometimes with _Thamnophis dorsalis cyclides_. On June 11, 1958, individuals of this species were found in a hyacinth-choked marsh at Tangamandapio at night. One specimen from Tangamandapio (UMMZ 119414) had, in life, a dark chocolate brown dorsum, reddish brown sides, and cream-colored belly, chin, and labials. There were no longitudinal dorsal stripes. ~Thamnophis scalaris scaliger~ (Jan) _Tropidonotus scaliger_ Jan, Elenco sistematico degli Ofidi, p. 70, 1863.--No type locality designated. Type locality restricted to Mexico City, Distrito Federal, by Smith and Taylor (1950a:329). _Thamnophis scalaris scaliger_, Smith, Zoologica, 27:103, October 23, 1942. Cerro Tancítaro (2); Nahuatzen; Opopeo; 26 km. S of Pátzcuaro. The few specimens of this species from Michoacán have been collected at elevations from 1800 to 3400 meters in pine or fir forest in the Cordillera Volcánica. ~Micrurus distans michoacanensis~ (Dugès) _Elaps diastema michoacanensis_ Dugès, La Naturaleza, ser. 2, 1:487, 1891.--Michoacán. Type locality restricted to Apatzingán, Michoacán, México, by Smith and Taylor (1950a:335). _Micrurus distans michoacanensis_, Zweifel, Amer. Mus. Novitates, 1953:11, June 26, 1959. Apatzingán (6). All specimens were collected in the arid scrub forest of the Tepalcatepec Valley. The number of black rings on the body varies from six to eleven. In this respect they agree with the diagnosis of this subspecies presented by Zweifel (1959b:9). ~Micrurus laticollaris~ (Peters) _Elaps marcgravii laticollaris_ Peters, Monats. Akad. Wiss. Berlin, p. 877, 1869.--Izúcar de Matamoros, Puebla, México. _Micrurus laticollaris_, Schmidt, Publ. Field Mus. Nat. Hist., zool. ser., 20:39, December 11, 1933. El Sabino (2); Lombardia.