242 DR. H. GADOW ON MEXICAN [June 6, 



Nearctic, extending into : Neotropical. 



Xot beyond Mexico. Central America. Antilles. 



Pelobatidfe _________ 



Ranidfe 



Pesmognathinae 



Amblj'stomatinas ^^___ 



Plethodontinse ^,. 



Heloderma__ 



Xenosaiu'us__ _ ____ 



Xantusiidse : a. Sonoran 



b. Southern 



Anouidfe 



AmphisbEenid0e_ 



-5f- 



Iguanidas : a. Xerophile_ 

 b. Hygrophile^ 



Glauconiidse 



Boidfe 



Crotalinee 



Colubrinse Aglyplia_ 



-)C- 



\ Colubriiife 



j Opisthoglyplia. 



Elapinfe. 



Tvpblopidpe. 



^- ^Tejidfe. 



.„ Geckouidse. 



. _ Engptomatidae. 



,jr. Cystignathidfe. 



,v liylidee . 



-V Riiffmiflfp. 



Chelonia : Testudmidfe_ 

 Cinosternidse. 



IJermatemydidte __ 



dispersal so far as America is concerned. Those which have sent 

 forms into the Greater Antilles are also indicated. 



The Greater Antilles have I'eceived their faima * from Nearctic 



* Gregory thinks it is "ahiiost certain" tliat Yucatan was connected with Cuba. 

 Other zoogeographers have likewise assumed this connection, and it looks very 

 plausible on the map. If it ever existed, it must have been very transitor3'. Amphibia 



