53(5 ZOOLOGY— BATRACHIANS 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 1 8 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 : 



CliOTALIDAE. 



Aploaspis hpida, Kennicott. 



Crotalus pi/rrhus, Cope. 



Crotalus mitchellii, Cope. 



Crotalus cerastes, Hallow. 



Crotalus t'ujris, Kennicott. 



Crotalus enyo, Cope. 



Crotalus horridus, Linn. 



Crotalus adamanteus, Deauv., subspecies adamanteus, Beatjv. 



Crotalus adamanteus, Beauv., subspecies atrox, Laird & GlRARD. 



Crotalus adamanteus, Beauv., subspecies seutulatus, Kennicott. 



Crotalus lucifer, Baied & Gieaed. 



Crotalus polystictus, Cope. 



Crotalus confluentns. Say. 



Crotalus molossus, Baiiid & GlRARD. 



Caudisona rava, Cope. 



Caudisona miliaria, Linn. 



Caudisona edwardsii, Lairh & Girard. 



Caudisona tergemina, Kay. 



