This snake is abundant in the lowlands of the state; the few specimens listed above are indicative not of the rarity, but rather of the speed and agility, of this diurnal snake. It most frequently is found near water, where there is a dense growth of vegetation. One individual was observed in a large pool inhabited by several small _Rana pipiens_, and another was seen along the bank of a hyacinth-choked river channel. A third individual was captured while it was in pursuit of a _Cnemidophorus_. This species has been collected on the coastal lowlands and seaward foothills of the Sierra de Coalcomán and in the Tepalcatepec Valley to elevations of 1150 meters. ~Elaphe triaspis intermedia~ (Boettger) _Pityophis intermedius_ Boettger, Ber. Offen. Vereins. Naturk., 22:148, 1883.--México. Type locality restricted to Hacienda El Sabino, Michoacán, México, by Dowling (1960:74). _Elaphe triaspis intermedia_, Mertens and Dowling, Senckenbergiana, 33:201, November 15, 1952. Twenty-four km. E of Apatzingán; Chupio; El Sabino (4); 11 km. E of Emiliano Zapata. Dowling (1960) has shown that specimens from the Balsas-Tepalcatepec Basin have fewer ventrals and caudals than those from the Sierra del Sur or the coast. All specimens from Michoacán were collected in open forest, either scrub or oak forest. They were found in drier situations than those described for the species in southern Tamaulipas by Martin (1958:69). In Michoacán _Elaphe triaspis intermedia_ is known from the Tepalcatepec Valley, the lower slopes of the Cordillera Volcánica, and the western edge of the Mexican Plateau at an elevation of 1350 meters. It probably occurs in the lower parts of the Sierra de Coalcomán and along the Pacific coast, for it is known from the coastal lowlands of Guerrero and Colima. In August, 1951, I saw a snake that probably was this species in Barranca de Bejuco. ~Enulius unicolor~ (Fischer) _Geophis unicolor_ Fischer, Abh. Nat. Ver. Bremen, 7:227, 1882.--México. Type locality restricted to Chilpancingo, Guerrero, México, by Smith and Taylor (1950a:331). _Enulius unicolor_, Taylor and Smith, Univ. Kansas Sci. Bull., 25:247, July 10, 1939. Between Ario de Rosales and La Playa; Coalcomán; Jungapeo (4); between Zitácuaro and Tuxpan. This small snake has been collected from beneath rocks in brushy areas and broad-leafed forest between 900 and 1800 meters; it has not been found in coniferous forest. The limited ecological data suggest that the species inhabits the transition zone between the tropical scrub forest and the temperate hardwood forest.