CHECKLIST OF THE SNAKES OF MEXICO 



203 



coupled with the very varied topography of these states, accounts for 

 their extensive lists. Other states ^Yith nearly equally varied topog- 

 raphy, but less well known, probably have more extensive faunas in 

 proportion to those of Veracruz and Oaxaca than are now indicated. 

 States toward the north, or in areas of little topographic variety, have 

 relatively meager faunas. In general, the above sequence appears to 

 be a true indication of the relative complexity of the state faunas, 

 although, of course, many gaps remain to be filled, and there will un- 

 doubtedly be some shifting of position as faunas of the several areas 

 become better known. 



In these territorial compilations the faunas of islands have been 

 ascribed to the state to which the island belongs. Among the less 

 obvious of these are the Eevillagigedos Islands, included with Colima; 

 the Tres Marias and Isabel Islands, included with Nayarit; Patos, 

 Pelican, San Esteban, San Pedro Martir, San Pedro Nolasco, and 

 Tiburon Islands, included with Sonora ; Mujeres and Cozumel Islands, 

 included with Quintana Roo. Other islands from which snakes are 

 known belong to the state or territory to which they are most closely 

 situated geographically. 



AGUASCALIENTES 



Pituophis doppei deppei 



BAJA CALIFORNIA 



Leptotyphlops humilis humllis 

 Leptotyphlops humilis cahuilae 

 Leptotyptilops humilis slevini 

 Lichanura roseofusca roseofusca 

 Lichanura trivirgata 

 Arizona elegans occidentalis 

 Chilomeniscus cinctus 

 Cbilomeniscus stramineus stramineus 

 Chilomeniscus stramineus t sterensis 

 Diadophis amabilis anthonyi 

 Diadophis amabilis similis 

 Elaphe rosallae 



Hypsiglena ochrorhyncha ochrorhynclia 

 Hypsiglena slevini 

 Lampropeltis californiae 

 Lampropeltis cataliuensis 

 Lampropeltis getulus boylii 

 Lampropeltis getiilus conjuucta 

 Lampropeltis getulus yumensis 

 Lampropeltis nitida 

 Lampropeltis zonata zonata 

 Lampropeltis zonata agalma 

 Lampropeltis zonata herrerae 

 Masticophis aurigulus 

 Masticophis barbouri 

 Masticophis flagellum piceus 



Masticophis lateralis 



Phyllorhynchus decurtatus decurtatus 



Pituophis catenifer annectens 



Pituophis catenifer deserticola 



Pituophis vertebralis 



Rhinocheilus lecontei lecontei 



Salvadora hexalepis hexalepis 



Salvadora hexalepis virgultea 



Sonora bancroftae 



Sonora mosaurei 



Sonora semiannulata isozona 



Sonora semiannulata linearis 



Tantilla eiseni eiseni 



Tantilla planicops 



Trimorphodon lyrophanes 



Natrix valida 



Thamnophis digueti 



Thamnophis hammondii 



Thamnophis ordiuoides hueyi 



Pelamis platurus 



Crotalus atrox 



Crotalus cerastes laterorepens 



Crotalus enyo 



Crotalus exsul 



Crotalus lucasensis 



Crotalus mitchellii mitchellii 



