3S0' 



COLUBRIDiE. 



Fig. 26. 



Skull of Zamenis gemonensis. 



Synopsis of the Species. 

 I. A pair uf iuternasals and a pair of prsefronfcals. 



A. Posterior chin-shields in contact anteriorly *. 

 Scales in 13 rows ; ventrals 194-197 .... 1. dipsas, p. 383. 



Scales in 15 rows; ventrals 162-177 

 Scales in 17 rows ; ventrals 190-208 . . 



2. korros, p. 384. 



3. mucosus, p. 38&. 



B. Posterior chin-shields usually separated from each other by 

 scales. 



1. Scales in 15 or 17 rows (exceptionally 19 in Z. flagelli- 

 formis ?). 



a. Portion of rostral seen from above not more than half as 

 long as its distance from the frontal. 



a. Frontal anteriorly wider than the supraocular. 



* Scales in 15 rows ; fourth and fifth labials entering 

 the eye 4. oaxacm, p. 386. 



* It is necessary, for ascertaining this character, to distend the skin of the 

 chin to make sure that small scales are not hidden in the mental groo\e. 



