180 COLTJBKID^. 



c. Nostril between two small nasals and the first labial. 

 Scales keeled ; subcaudals single . . 32. Haplocercus, p. 309. 

 Scales smooth ; subcaudals single. . 33. Aspidura, p. 310. Itij' ''■- 

 Scales smootn ; subcaudals paired . . 34. Blythia, p. 313. -h^^*-^ 



6. Posterior maxillary teeth enlarged; anterior mandibular 



teeth much larger than the posterior ; eye small, with 

 round pupil. 



Scales smooth, without pits 35. Pseudoxyrhopus, p. 314. 



7. Maxillary teeth equal; anterior mandibular teeth larger 



than the posterior ; eye moderate, with vertically elliptic 

 pupil ; scales with apical pits. 



Scales keeled ; no loreal shield .... 36. Lycognathophis, p. 317. 

 Scales smooth 37. Ablabophis, p. 318. ' • 



8. Posterior maxillary and mandibular teeth smallest ; eye 



moderate or rather small, pupil usually vertically elliptic. 



a. Maxillary teeth forming a continuous series. 

 a. No loreal pit. 



Scales smooth, without pits ; pupil round. 



38. Tetralepis, p. 319. 



Scales smooth, without pits ; pupil vertically subelliptic. 



39. Lamprophis, p. 320. 



Scales keeled, with apical pits, the middle row enlarged and bica- 

 rinate 40. Gonionotopliis, p. 323. 



/3. Loreal region with a pit ; scales without pits. 



Scales keeled 41. Bothrophthalmus , p. 324. 



Scales smooth 42. Bothrolycus, p. 325. ^ 



h. Enlarged anterior maxillary teeth separated from the 

 small teeth by an interspace. 



a. Scales equal, smooth, with apical pits. 



Nostril between two nasals ; pupil round. 



43. Cyclocorus, p. 326. 



Nostril between two nasals ; pupil vertical. 



44. Boodon, p. 327. 



Nostril in a single nasal, followed by a small postnasal ; pupU 

 vertical 45. Lycophidium, p. 336. 



/3. Scales without pits, middle row enlarged. 



Body compressed : scales smooth . . 46. 'Hormonotus, p. 343. 

 Body cylindrical ; scales keeled . . 47. Simocephalns, p.''344. 



II. Hypa^iophyses absent in the posterior dorsal vertebrae, the lower 

 surface of which is smooth or with a low keel (see fig. 12, B, 

 p. 171). 



[The Synopsis to be continued in the second volume.] 



