184 BEPTILESo 



of confluent, brown, lozenge - shaped spots; tail black; 

 a light loral line with a dark patch beneath; scales 23 to 

 25; G. 165 to 170; L. 40 to 60. U. S., chiefly eastward 

 and southward, in rocky places; rapidly becoming ex- 

 tinct; several other species occur southwestward. (C. 

 durisstis, Auct.) 



2. CAUDISONA, Laurenti. MASSASSAUGAS. 



= (Jrotalophorus, Gray. 



1. C. tergemina, (Say) Cope. MASSASSAUGA. PRAIRIE 

 RATTLESNAKE. Brown or blackish with about seven 

 series of deep chestnut blotches, sometimes entirely 

 black; scales 25; G. 140 to 150; L. 30. Prairie region, 

 E. to the Alleghanies; abundant in grassy fields where 

 not exterminated. 



3. ANCISTRODON, Beauvais. COPPERHEADS. 

 > Toxicophis, Troost. 

 < Trigonocephalus^ Holbr., etc. 



1. A. contortrix, (L.) B. & G. COPPERHEAD. Hazel 

 brown; top of head bright coppery, back with a series 

 of fifteen to twenty-five dark blotches having something 

 the form of an inverted Y ; yellowish below wit'h dark 

 blotches; scales 23; G. 150 to 160; L. 35 to 40. E. U. S., 

 chiefly southerly. 



2. A. atrofuscus, (Troost) B. & G. HIGHLAND MOC- 

 CASIN. COTTONMOUTH. Dusky above, with smoky gray 

 blotches; tail black; belly white, blotched with black 

 and minutely punctate; upper lip white; scales 25; G. 

 130 to 140; L. 25. Mts. of Tenn. and N. C. and South. 



3. A piscivorus, (Holbr.) Cope. WATER MOCCASIN. 

 Greenish brown with dark vertical bars; scales 25; G. 

 140; L. 30. Aquatic; southern, probably not in our 

 limits. 



