6 COLUBRID. 
Snout much depressed, strongly = aoa ; nasal fused with the 
anvernasal “200.050.6255. . Chilomeniscus, IT. p. 272.1%.“ 
** Anterior maxillary and mandibular teeth OB. 
102. Homalosoma, II. p. 278. 
2. Scales without pits. 
a. Maxillary and mandibular teeth subequal, 15 to 35; 
pupil round; anterior temporal present. 
a. Loreal and prefrontal not entering the eye. 
Head not or but slightly distinct from neck ; eye moderate or rather 
small; maxillary teeth 15 to 30. 
103. Ablabes, IT. p. O77. 
Head distinct from neck; eye moderate; body stout; maxillary 
Pode AP AO 2D eS weg ais, #8 104. ,Grayia, II. p. 286. 2/~: 
Head distinct from neck ; eye large; maxillary teeth 35. 
105.:Xenurophis, IT. p. 288. 
B. Loreal and preefrontal entering the eye, which is small. 
Nostril lateral, between two nasals. 
106. Virginia, II. p. 288. 
Nostrils directed upwards, in a semidivided nasal; two internasals. 
107. Abastor, IT. p. 289. 
Nostril directed upwards, in a semidivided nasal; a single inter- 
SUI es o's « oi 5¥s 03 he ues 108. Farancia, II. p. 290. va. 
b. Posterior maxillary and mandibular teeth shortest; 
anterior temporal usually present. 
a. Head distinct from neck ; pupil vertically elliptic. 
Vertebral row of scales enlarged ; eye large. 
109. Petalognathus, II. p. 292, 
Dorsal scales equal; eye moderate or large. ] 
110. Tropidodipsas, II. p. 294. ©" ' 
Dorsal scales equal; eye small. 111. Dirosema, II. p. 298. 
(. Head not distinct from neck ; pupil round or ror 
subelliptic .... 112, Atractus, II. p. 299; A, 28 
c. Maxillary teeth small, subequal, 8 to 12: anterior 
temporal present ; eye very small. 
Nostril in a single nasal; loreal and prefrontal entering the eye. . , 
114. Carphophis, II. p. 324. V-" 
Nostril between two nasals and the internasal; snout with angular 
horizontal edge .......... 116, Geagras, II. p. 326. a e4 
