LIST OF ILLUSTRATIONS. 



PLATES. 



Plate 1. — Harlequin Snake, Elaps fulrius. From Baird, Report Mexican 

 Boundary Survey. 

 2. — Sonorau Coral Snake, Elaps euryxanthus. From a specimen in the 



U. S. National Museum. 

 3. — Copperhead, Ar/listrodon contortrix. From a cast in the U. S. Na- 

 tional Museum. 

 4. — Water Moccasin, Aykiatrodon piscivorus. From a cast in the U. S. 



National Museum. 

 5. — Massasauga, Sistriirus catenatus. From Hoi brook, North American 



Herpetology. 

 6. — Edwards' Massasauga, Sistrurus catenatus Edwardsii. From Baird, 



Rejiort Mexican Boundary Survey. 

 7. — Ground Rattlesnake, Sistrurus miliarius. From a cast in the U. S. 



National Museum. 

 8. — Dog-faced Rattlesnake, Crotalus molossus. I'rom Hallowell, Paci 



fie Railroad Report. 

 9. — Banded Rattlesnake, 6Vo/fl/».s horridua. From a cast in the U. S. 

 National Museum. 

 10. — Diamond Rattlesnake, Crotalus adamanteus. From a cast in the 



U. S. National Museum. 

 11. — Texas Rattlesnake, Crotalus atrox. From Baird, Report Mexican 



Boundary Survej-. 

 12. — Prairie Rattlesnake, Crotalus contluentus. From Baird, Pacific 



Railroad Report. 

 13. — Pacific Rattlesnake, Crotalus lucifer. From Baird, Pacific Rail- 

 road Report. 

 14. — Tiger Rattlesnake, Crotalus tigris. From Baird, Report Mexican 



Boundary Survey. 

 15. — Horned Rattlesnake, Crotalus cerastes. From Baird, Report Mex- 

 ican Boundary Survey. 

 16. — Green Rattlesnake, Crotalus lepidus. P^om a specimen in theU. S. 



National Museum. 

 17. — White Rattlesnake, Crotalus JUtchellTi. From a speein en in the 



U. S. National Museum. 

 18. — Indian Cobra, Naja naia. After figure in Fayrer Thanatophidia of 



India. 

 19. — West Indian " Fer-de-lance," i?o</(roj;s lanceolatus. From a speci- 

 men in the U. S. National Museum. 



TEXT FIGURES. 



Page. 



Fig. 1.— Diagrammatic lateral view of the head of Trajfoijs. After Niemann. 3.50 



2.— Cross-section of the grooved fang of Tragops. After Niemann 350 



485 



