NORTH AT^rKRICAN IJAI'R \(iTI A AXD RERTILIA. 48 



rows wi<le, 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. 7'homhifer^ 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 29-81. 



75. T. Gyclopium, 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-half scales wide, and 

 three and one-lu\lf or four scales apart; beneath brownish-white; 

 G. 140-145. Florida; S. Illinois. 



22. Genus PIelicops, Wagler. 

 Teeth smooth, the posterior two in upper jaw longer than 

 and separated from the others; prefrontals one or two; nostril 

 not higiier than wide; nasal grooved; loral sometimes absent; 

 auteorbitals 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., Garmau. 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, iive 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- 

 luilf 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; loral 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 



