536 ZOOLOGY BATE ACH LANS AND REPTILES. 



"The following table shows how these are distributed: 



"Regio Neotropica ' 5 



"S. R. Brasiliana.. 2 



"S. R. Mexicana. 4 



"Regio Nearctica 13 



"S. R. Sonoriana.. 10 



"S. R. Californiana. 1 



"S. R. Media.. 3 



"S. R. Orientalis. 2 



18 



Since this synopsis was published, Professor Cope, as already stated, 

 has restudied the genera and species of this group, and made important 

 changes, reducing the number of species from 18 to 15; some of the species 

 formerly considered by him as valid being now characterized as subspecies. 

 From his check-list, shortly to be published by the Smithsonian Institution, 

 which he has kindly furnished me, I am enabled to give the following list of 



species : 



CKOTALIDAE. 



Aploasjns kpida, KENNICOTT. 

 Crotalus pyrrhus, COPE. 

 Crotalus mitchellii, COPE. 

 Crotalus cerastes, HALLOW. 

 Groin Jus tigris, KENNICOTT. 

 Crotalus cnyo, COPE. 

 . Crotalus liorridus, LlNN. 



Crotalus adamanteus, BEAUV., subspecies adamantntx, BEAUV. 

 Crotnlus adamanteus, BEATTV., subspecies at.rox, BAIRD & GIRARD. 

 Crotalus adamanteus, BEAUV., subspecies sctitulatus, KENNICOTT. 

 Crotalus lucifer, BAIRD & GIBACD. 

 Crotalus potystictus, COPE. 

 Crotalus conjluentus, SA^'. 

 Crotalus molossus, BAIUD & GIRARD. 

 Caitdisona rava, COPE. 

 Caudisona miliaria, LINN. 

 Caudisona cdwardsii, BAIKD & GIKARD. 

 Caudisona tergcmina,, SAY. 



