New Salamanders of the Plethodontid Genus Pseudoeurycea from the Sierra Madre del

The salamanders inhabiting the Sierra Madre del Sur are all mem-bers of the family Plethodontidae. At least four genera are represented, but only two of these are diversified. The range of one species extends into the state of Guerrero, where others will undoubtedly be discovered. The majority of the species are restricted to the mountains of Oaxaca, where several populations are evidently isolated, and in some instances well differentiated. Because many of the higher peaks in the Sierra were relatively inaccessible to collectors, however, the distributions of the salamanders in the region have remained obscure. Prior to 1960 nearly all the specimens in collections were from the humid Pacific slopes of the Sierra de Miahuatlan at the southern extremity of the state, or from Cerro San Felipe, which rises to an elevation of 3111 meters (10,207 feet), 12 kilometers north-northeast of the capital city, Oaxaca de Juarez. When I began field investigations in the state of Oaxaca in the summer of 1961, collections containing salamanders also had been obtained in the Sierra de Juarez, roughly 60 kilometers north-northeast of Cerro San Felipe, but few specimens were available from other por-tions of the Sierra Madre del Sur. As I proceeded with my investigation during the summers of the en