28 
NORTH AMERICAN BATRACHIA AND REPTILTA. 
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; G. 165-170, North 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 Ancistrodon, Beauv. 
5. A. piscivorus, subsp. piscivorus, Lac. Water Moccasin. 
No 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. atrofusous , 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 
