180 COLUBRID. 
ec. 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. 
Scales smooth ; subcaudals paired.. 34. Blythia, p. 313. 
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... ..... sees es cees 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- 
PN oo. 855 35nd Caan es 40. Gonionotophis, p. 323. 
; f. Loreal region with a pit ; scales without pits. 
‘Beales kecled ..........0..0000: 41. Bothrophthalmus, p. 324. 
Scafes smooth ...........0..5- 42. Bothrolycus, p. 325. 
’  }, 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. 
JN ostril between two nasals; pupil vertical. 
’ 44, Boodon, p. 327. 
; Nostril in a single nasal, followed by a small postnasal; pupil 
i a 
WRENNER 5... . ». Rae 45, Lycophidium, p. 336. 
8B. Scales without pits, middle row enlarged. 
Body compressed ; scales smooth .. 46. Hormonotus, p. 343. | 
Body cylindrical ; scales keeled .. 47. Simocephalus, p. 344. ( 
II. Hypanophyses absent in the posterior dorsal yertebre, the lower a 
, surface of which is smooth or with a low keel (see fig. 12, B, | 
p. 171). | = . 
‘ [The Synopsis to be continued in the second noe 
P. 
ao: | as 
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