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).
Carapan (2); Erongaricuaro; Maravatio (3); Morelia (2); Nahuatzen; Pátzcuaro (7); Tacícuaro (8); Tancítaro.
This species has been collected in oak, pine-oak, and fir forests at elevations of 1900 to 2450 meters on the mountains rising from the Mexican Plateau. It does not seem to be so abundant as Conopsis biserialis. Sufficient ecological data to determine differences in habitat between the two species have not been compiled.
Diadophis dugesi Villada
Diadophis punctatus dougesii Villada, La Naturaleza, 3:226, 1875.—Potreros de Balbuena, Distrito Federal, México.
Diadophis dugesii, Blanchard, Bull. Chicago Acad. Sci., 7:51, December 30, 1942.
Morelia (2); Pátzcuaro; Quiroga.
Apparently this snake is uncommon in Michoacán. It has been found only at elevations of 1900 to 2200 meters in pine and pine-oak forests on the mountains rising from the Mexican Plateau.
Dryadophis melanolomus stuarti Smith
Dryadophis melanolomus stuarti Smith, Proc. U. S. Natl. Mus., 93:418, October 29, 1943.—Acapulco, Guerrero, México.