COLUBRIN &. 3 
* Head distinct from neck; eye large or rather large ; 
body much elongate; scales with apical pits. 
_ } Scales forming longitudinal series. 
Maxillary teeth 12 to 20 .... 54. Zamenis, I. p. 379. 
Maxillary teeth 25 to 30; scales of vertebral row enlarged. 
56. Xenelaphis, II. p. 7. 
Maxillary teeth 22 to 32; no suboculars. 
57. Drymobius, II. p. 8. 
++ Scales disposed obliquely, at least on the anterior 
part of the body ; maxillary teeth 20 to 25. 
Lateral scales as long as dorsals. 66.°Chlorophis, II. p. 91. 
Lateral scales much shorter than dorsals. 
70.° Thrasops, II. p. 104. 
** Head not or but slightly distinct from neck; eye 
moderate or small. 
+ Internasals, nasals, and prefrontals distinct. 
t Subcaudals in two rows. ; 
Maxillary teeth 14 to 24; scales without pits; tail conical. 
81. Rhadinza, II. p. 160. 
Maxillary teeth 13 to 16; scales without pits ; usually one or more 
suboculars ; tail long, thick os oe ending obtusely. 
f Lee 5 ' 2. Uvetheoa, II. p. 180. - 
Maxillary. teeth 12 to 20, on not compressed ; scales with 
apical pits; no suboculars.. 88. ‘Coronella, II. p. 188. 
Maxillary teeth 8 to 11, Be eee not compressed ; snout strongly 
PRR OCHIN ESE Wie eases 91. Cemophora, II. p. 213. 
Maxillary teeth 8 to 12, posterior compressed ; snout more or less | 
projoctinmerin. (7h. toes tens 92. Simotes, IT. p. 214. 
tt Subcaudals single; snout strongly projecting ; 
maxillary teeth 16 to 19. 
90. Rhinochilus, II. p. 212. 
+f A single prefrontal; two internasals. 
Eye small; nostril between two nasals. 
83. Trimetopon, II. p. 184. 
Eye very small; nasal single.. 84. Hydromorphus, II. p. 185. 
ttt A single internasal; two prefrontals; nasal 
semidivided, in contact with the preocular. 
Eye rather small ; scales as broad as long. 
85. Dimades, II. p. 185. 
Eye very small ....0.5..... 86. Hydrops, II. p. 186. 
B2 
