LIST OF ILLUSTRATIONS. 



PLATES. 



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

 Boundary >Survey. 

 2. — Sonoran Coral Suake, Elajis euryxanihus. From a specimen in the 



U. S. National Museum. 

 3. — Copperhead, AgMstrodon contortrix. From a cast in the U. S. Na- 

 tional Museum. 

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



National Museum. 

 5. — Massasauga, Sistrin-us catenatus. From Holbrook, North American 



Herpetology. 

 6. — Edwards' Massasauga, Sistrurus catenatus Edtvardsii. From P.aird, 



Report Mexican l^oundary Survey. 

 7. — Ground Rattlesnake, tSistrurus miliariKs. From a cast in the U. S. 



National Museum. 

 8. — Dog-faced Rattlesnake, Crotahis molossiis. From Hallo"well, Paci 



fie Railroad Report. 

 9. — Banded Rattlesnake, Crotatus horridust. From a cast in the U. S. 

 National Museum. 

 10. — Diamond Rattlesnake, Crotahis adamanteits. From a cast in the 



U. S. National Museum. 

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



Boundary Survey. 

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



Railroad Report. 

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

 road Report. 

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



Boundnry Survey. 

 15. — Horned Rattlesnake, Crotalus cerastes. Fi'om Baird, Report Mex- 

 ican Boundary Survey. 

 16. — Green Rattlesnake, Crotalus lepidus. From a sj^ecimen in the V. S. 



National Museum. 

 17. — White Rattlesnake, Crotalus JlitchelVii From a si)eciii 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</nv)jjs lunceolatns. From a speci- 

 men in the U. S. National Museum. 



TEXT FIGURES. 



Page. 



Fig. 1.— Diagrammatic lateral view of the head of Tragops. After Niemann. 3r>0 



2. — Cross-sectmn of the grooved fang of Tragops. After Niemann 35C 



485 



