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l snake is an inhabitant of the coniferous forests and the pine-oak forests on the Cordillera Volcanica. Data on the series from between Zitacuaro and the Rio Tuxpan were given by Taylor (1940c:481). ~Tantilla calamarina~ Cope _Tantilla calamarina_ Cope, Proc. Acad. Nat. Sci. Philadelphia, 18:320, February 13, 1867.--Guadalajara, Jalisco, Mexico. Apatzingan; La Placita. Although this snake has been collected at high elevations along the rim of the Mexican Plateau in Nayarit, Jalisco, Mexico, and Puebla, the specimens from Michoacan are from arid scrub forest at elevations of less than 400 meters. The species has been found in similar habitats in Colima (Oliver, 1937:24) and in Sinaloa and the Tres Marias Islands (Zweifel, 1960:110). ~Toluca lineata lineata~ Kennicott _Toluca lineata_ Kennicott, _in_ Baird, Report on the United States and Mexican boundary survey, 2, Reptiles, p. 23, 1859.--Valley of Mexico. _Toluca lineata lineata_, Taylor and Smith, Univ. Kansas Sci. Bull., 28:343, May 15, 1942. Capacuaro; Carapan (12); Cheran (23); Cojumatlan; Los Reyes; Morelia (2); Nahuatzen; Paracho (10); Patzcuaro (17); Uruapan (2). This small snake is an inhabitant of the coniferous forests between elevations of about 1550 and 2800 meters. Not infrequently, individuals have been found in pine-oak forest within these elevations. The generic status of _Toluca_ is unsettled. Taylor and Smith (1942b) separated _Toluca_ from _Conopsis_ by the presence of enlarged and grooved posterior maxillary teeth in _Toluca_ and their absence in _Conopsis_. Bogert and Oliver (1945:378) suggested synonymizing _Toluca_ with _Conopsis_. Smith and Laufe (1945:12) defined the generic position of _Toluca_. Actually, in deciding the generic position of these snakes, five genera (_Ficimia_, _Gyalopion_, _Pseudoficimia_, _Conopsis_, and _Toluca_) must be considered. Of these _Ficimia_ and _Gyalopion_ are closely related; they have been placed in one genus by some workers. _Pseudoficimia_ is intermediate between _Ficimia-Gyalopion_ and _Toluca-Conopsis_. A workable definition of the supraspecific classification of these snakes must await a thorough review of the species. ~Trimorphodon biscutatus biscutatus~ (Dumeril, Bibron, and Dumeril) _Dipsas biscutata_ Dumeril, Bibron, and Dumeril, Erpetologie generale, 7 (pt. 2):1153, 1854.--Mexico. Type locality
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