( xxviii ) 



Scales in 21 rows, keeled. Numerous reti- 

 culating pale bands . . . C. reticulare. 

 Scales in 23 rows, keeled . . . C. Hodgsonii. 



Ctnophis. 



Scales keeled or with apical grooves in 25 to 27 rows. 1 

 prseocular. 



Scales in 25 rows . . . C. Malabaricus. 



Scales in 27 rows .,. G.Helena. 



Ptyas. 

 Loreals 1 to 3. Scales in from 15 to 17 rows. Smooth or 

 faintly keeled. 



Scales smooth in 17 rows. Loreal one ... P. hexagonotus. 

 Scales partly keeled in 17 rows. Loreals 



three ... P. mucosus. 



Scales mostly smooth in 15 rows. Loreals 



two ... P. korros. 



Zamenis. 

 An interspace before the lengthened posterior maxillary teeth. 



Scales in 19 rows. A semi-circular shield 



behind each occipital ... Z. ventrimaculatus. 



Scales in 21 rows. Upper labials nine. 



Anal bifid ... Z. gracilis. 



Scales in 21 — ^23 rows. Upper labials eight. 



Anal bifid ... Z. fasciolatus. 



Scales in 23 rows. Anal entire ... Z. brachyurus. 



Scales in 29 rows. Loreals three or four ... Z. diadema. 



Group c. — Dryadina. 

 Tree colubrines. Body rather compressed. 



Zaoccys. 

 Scales in 14 or 16 rows. 

 One loreal. Four median rows of scales, 



keeled ... Z, nigromarginatus. 



