COLTIBEIDJB. 279 



Series A. A GLYPH A. 



Subfamily I. COLUBRIN^E. 



Postfrontal bone not produced over the supratemporal region. 

 Scales imbricate. Head- shields and ventrals large. 



Synoprii of Indian Genera *. 



A. Terrestrial or arboreal Snakes, with the 

 hypapophyses developed only on the 

 anterior half of the vertebral column, 

 and the nasal bones at least as large as 

 the praefrontals. 

 a. Posterior border of ventral shields with- 



out lateral notch. 



'. Anterior mandibular teeth longer 

 than the posterior ; eye small or 

 rather small. 



a". No internasal or temporal shields. CALAMARIA, p. 281. 

 b". One or two internasals ; temporals 



present. 



a. Posterior maxillary teeth a little 

 longer than the anterior ; pupil 

 vertically subelliptic ; sub- 

 caudals m two rows. 



a'. A loreal and a prseocular . . THACHISCHIUM, p. 284. 

 /3'. No loreal or prasocular .... BLYTHIA, p. 287. 

 $. Maxillary teeth equal in length ; 

 pupil round ; subcaudals single. 



a.' Scales smooth ASPIDURA, p. 288. 



/3'. Scales keeled HAPLOCERCUS, p. 290. 



y. Anterior maxillary teeth en- 

 larged ; pupil vertically elliptic. LYCODON, p. 291. 

 b'. Mandibular teeth subequal in 

 length, maxillary teeth equal, or 

 posterior largest. 

 a". Eye very small, with round pupil ; 



tail very short XYLOPHIS, p. 283. 



b". Eye with vertically elliptic pupil ; 



tail long. 

 a. Eye large ; ventrals strongly 



keeled HYDROPHOBUS, p. 297. 



/3. Eye small ; ventrals not keeled. PSEUDOCYCLOPHIS, p. 299. 

 y. Eye moderate ; nostril an oblique 



slit between two nasals LYTORHYXCHTS, p. 322. 



* Through the kind mediation of Mr. W. L. Sclater I have obtained from 

 the Trustees of the Indian Museum communication of the types of Theobald's 

 Falconeria bengalensis and Cadmus cuneiformis. The former is a North- 

 American Snake, Conocephalus striatulus, the latter a South-African, Coronclla 



