NORTH AMERICAN BATRACHIA <VNI) REPTILIA. 
43 
rows wide, and three to five scales long; beneath yellowish- white, 
with brown blotches; G. 140-145. North Carolina to Georgia. 
Dorsal rows 27, all carinated. 
74. T. rhombifer , Hallo well. Postorbitals two or three; 
color above light brown; about 50 dorsal blotches of same color, 
surrounded by black lines; beneath yellowish-white, blotched 
with darker; G. 140-145. Louisiana to Illinois and Michigan. 
y. A suborbital series of plates; dorsal rows 29-31. 
75. T. cyclopium , Dum. et Bib. Ante and postorbitals 
two; (in Cuban specimens, one anteorbital and only 23 dorsal 
rows); color above dark plumbeous brown, with blackish alter- 
nating vertical bars, one or one and one-lialf scales wide, and 
three and one-half or four scales apart; beneath brownish-white; 
G. 140-145. Florida; S. Illinois. 
22. Genus LIelicops, Wagler. 
Teeth smooth, the posterior two in upper jaw longer than 
and separated from the others; prefrontals one or two; nostril 
not higher than wide; nasal grooved; loral sometimes absent; 
anteorbitals one or two; postorbitals two or three; temporals four 
to twelve; upper labials eight or nine; lower nine or eleven; 
dorsal scales carinate in 10 to 25 rows. 
76. H. alleni , Garman. Head continuous with neck; one 
prefrontal; nasal plates meeting behind rostral; loral present; 
one ante and three postorbitals; color in longitudinal bands; the 
vertebral dark brown, five and two half scales wide; the next 
yellowish-brown, two half scales wide; the next dark brown, two 
and two half scales wide; the next brownish-yellow, two and one- 
half scales wide; beneath and on upper labials dull yellow or 
straw color; dorsal scales smooth, in 19 rows, exterior very wide; 
two vertebral rows of tail strongly keeled; G. 128. Florida. 
23. Genus Heterodox, Beauv. 
Posterior palatine teeth largest; rostral produced, recurved 
and keeled; behind rostral and between frontals one or more 
small plates; nasals two; lorai^one or two; orbit. bordered below 
and on sides by a continuous chain of small plates; dorsal scales 
more or less carinate, smooth in some foreign species; anal 
divided; head broad and short; body stout; tail short; head, 
neck and body capable of great dilation. 
A. Azygos in direct contact with frontals. 
77. H. platyrhinus , (Latr.) Cope. Blowing Adder. Ros- 
tral prominent; scales on back of head carinate; center of eye 
6 - 
