CHECKLIST OF THE AMPHIBIA OF MEXICO 



101 



identified satisfactorily. For this reason we have been unable to 

 allocate some published records, and others only with some or consid- 

 erable doubt. We have elimiuated from these lists records we think 

 preposterous, but have retained some that are possibly correct even 

 though unlU^ely. 



All political areas are represented by three or more records. 

 Arranged according to the number of species knoAvn from each, the 

 following sequence results: 



Veracruz 71 



Oaxaca 53 



Chiapas 47 



Guerrero 42 



Puebla 33 



Eidalgo 29 



Mexico 28 



San Luis Potosf 27 



Morelos 25 



Jalisco 22 



Michoacdn 21 



Sinaloa 21 



Sonora 20 



Nayarit 19 



Tamaulipas 19 



Tabasco 18 



Colima 17 



Chihuahua 17 



Campeche 16 



Nuevo Le6n 16 



Yucatdu 16 



Baja California 15 



Distrito Federal 14 



Coahuila 13 



Durai'.go 13 



Guanajuato 12 



Zacatecas 10 



Tlaxcala 5 



Aguascalientes 4 



Quer^taro 3 



Quintana Roo 3 



Veracruz with 71 forms recorded possesses an extremely large 

 proportion of the species of Mexico. This is due perhaps as much 

 to relatively extensive collecting as to favorable environments; 

 important also is the wide variety of niches in the state. Oaxaca 

 with equally varied niches is not so well collected. It is of interest 

 that these two states lead also in number of snake species represented, 

 although the disparity between them is not so great for snakes. Arid 

 or semiarid areas inhabited by many kinds of snakes have relatively 

 few amphibians, as for instance iu the case of Baja California. No 

 state has been really well collected, and most have been very poorly 

 investigated. Many additions are to be expected to the list as now 

 constructed. 



AGUASCALIENTES 



Scaphiopus multiplicatus 

 Hyla eximia 

 Rana pipiens 

 Rana montezumae 



BAJA CALIFORNIA 



Taricha klauberi 

 Ensatina croceater 

 Batrachoseps attenuatus leucopus 

 Aneides lugubris lugubris 

 Scaphiopus couchii 

 Scaphiopus hammondii 

 Bufo woodhousii woodhousii 



Bufo cognatus 

 Bufo californicus 

 Bufo boreas halophilus 

 Bufo punctatus 

 Hyla regilla 

 Hyla arenicolor 

 Rana pipiens 

 Rana aurora draytoni 



CAMPECHE 



Rhinophrynus dorsalis 

 Bufo horribilis 

 Bufo valliceps 

 Engystomops pustulosus 

 Leptodactylus labialis 



