28 NOKTIl AMERICAN BATKACIIIA AND KKl'TILTA. 



the same as in the preceding species; dorsal rows 27; 14-16 

 labials; three rows of scales between suborbitals and labials; 

 general color brown; three series of complete brown rhombs 

 with yellow edges, the median row largest and separated only 

 by their yellow margins; a yellow line from superciliary to 

 angle of mouth; Gr. 165-170, ITorth Carolina to Florida; 

 Mississippi. 



Genus Caudisona, Laur. 



3. C. miliaria^ Linn. Ground Rattlesnake. Color above 

 dark grayish ash ; a series of 38 or 45 dark brown dorsal 

 blotches, with a narrow yellowish border; a broad dorsal band 

 of brownish-red passing through these from head to tail; three 

 series of blotches on each side; a white line from lowest part 

 of orbit extending back obliquely to angle of mouth; below 

 reddish-yellow, marmorated with blackish blotches and minute 

 dots; dorsal rows 22-25, all carinated; G. 130-140. Austro- 

 riparian and Sonoran regions. 



4. C. tergemina^ (Say) Cope, Massassauga. Color above 

 brown ; about thirty-four deep chestnut-brown dorsal blotches ; 

 blackish externally, and with yellowish-white margins; three 

 lateral series of blotches; a narrow band of yellowish-white 

 from the pit to neck ; below blackish-brown and yellowish ; color 

 above sometimes uniform black; dorsal rows 25, all carinated 

 except the outer one; G. 135-150. Eastern region west of 

 Alleghany Mountains; Georgia. 



Genus Ancistkodon, Beauv. 



5. A. piscivorus, subsp. piscivorus, Lac. Water Moccasin. 

 Ko loral plate ; two pairs of occipitals ; upper wall of pit formed 

 by anti-orbital; third labial large, constituting the inferior wall 

 of orbit; general color brown, with 20 or 30 indistinct dark 

 vertical bars, one or two scales wide; beneath black with 

 yellowish- white blotches; an obsolete brown streak behind eye; 

 dorsal rows 21-25; G. 138-145. Austroriparian region, except 

 Texas. 



6. A. atrofusGus^ Troost. Black Moccasin. Above dusky 

 with rhomboidal smoky-gray dorsal blotches, disappearing near 

 the black tail; beneath white, blotched with black and minutely 

 punctate; upper lip white; dorsal rows 25; G. 130-140. 

 Mountains of Tennessee and North Carolina. 



7. A. contortrix^ Linn. Copper Head; Cotton Mouth. 

 Loral present; suborbital plates present; one pair of occipital 



