PLATE I 

 Representative American Pit Vipers (CROTALIDAE) 



Figure 1. Rock Rattlesnake, Crotalun lepidus. 

 Photo by Hal B. Harrison; National Audubon. 

 (See pp. 36, 50) 



Figure 2. Massasauga, Sistrurus catenatus. 

 Photo by Charles Hackenbrock and Staten 

 Island Zoo. (Seep. 44) 



Figure 3. Cascabel, CroUUus durissus. Photo by 

 Roy Finney and Staten Island Zoo. ( See 

 p. 68) 



Figure 4. Cantil, Agkistrodon bilineatus. Photo 

 by Hal B. Harrison: National Audubon. (See 

 p. -A) 



Figure 5. Broad-banded American Copperhead, 

 Agkistrodon contortrix subspecies laticinctus. 

 I'lioto by J. Markham. (See p. 3'J) 



Figure 6. Cottonmouth, Agkistrodon piscivorus. 

 I'hoto by J. JIarkliam. (See p. 39) 



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