Skull of Zamenis gemonensis. 
Synopsis of the Species. 
I. A pair of internasals and a pair of prefrontals. 
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 .... 2. korros, p. 384. 
Scales in 17 rows; ventrals 190-208 .... 3, mucosus, p. 385. 
B. Posterior chin-shields usually separated from each other by 
scales. — 4 
1, Seales 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, a 4 | 
* Scales in 15 rows; fourth and fifth labials entering 
THOCFO i ivinee'e salou a.» 4, oawace, 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 groove. 2 
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