DIPSADOMORPHIN &, 31 
tt Loreal absent. 
Rostral moderate ............ 184. Homalocranium, p. 212. 
Rostral very large, prominent .. 185. Ogmius, p. 228. 
** Tnternasals united with anterior nasals. 
186. Stenorhina, p. 229. 
*** Tnterndsals distinct ; a single prefrontal ; 
vertebree with shield-like neural expansions. 
187. Xenopholis, p. 231. 
t. Maxillary very short, with 2 to 5 solid teeth ; grooved 
teeth below or in advance of the eye. 
a. No anterior temporal; parietals in contact with 
labials. 
* Palate toothed. 
No internasals; nasal entire, moderate. 
188. Apostolepis, p. 232. 
No internasals ; nasal entire, very small. 
| 191. Amblyodipsas, p. 244. 
Internasals distinct ; nasal divided or semidivided. 
193. Calamelaps, p. 245. 
** Palate toothless. 
Internasals distinct ; no preocular. 
194. Rhinocalamus, p. 247. 
No internasals ; nasal i in contact with an elongate preocular. 
195. Xenocalamus, p. 247. 
B. Postocular in contact with a temporal. 
* Nasal in contact with the rostral. 
t+ Nasal single. 
No internasals ; loreal present .. 189. Elapomoius, p. 237. 
No loreal; a preocular........ 190. Elapomorphus, p. 238. 
No loreal; no preocular ...... 196. Micrelaps, p. 248. 
+7 Nostril between two nasals. ‘ 
192. Elapotinus, p. 244. 
** First labial in contact with the internasal, 
197. Miodon, p. 249. 
2. Subcaudals single. 
a. Maxillary very short, with 2 to 4 solid teeth. 
a. First labial in contact with the internasal. 
No occipital shield............ 198. Polemon, p. 253. 
A large azygous occipital shield.. 199. Brachyophis, p. 254. 
