36 

 Key to the I n do- Australian species. 



A. Ventrals broader than the surrounding shields. 



I. Diameter of the eye about half its distance from 



the nostril; scales in 19 or 21 rows I. C. rufus p. 36. 



II. Diameter of the eye one third to one fourth its 

 distance from the nostril. 



a. Interocular width equal to the length of the 



snout; scales in 21 rows 2. C. lineatus p. 37. 



b. Interocular width more than the length of 



the snout; scales in 23 rows 3- c - opisthorhodus p. 38. 



B. No enlarged ventrals. 



1. Nasals forming a suture behind the rostral; 



scales in 20 rows 4- C. bouhngeri p. 38. 



2. Nasals separated from one another; scales in 



22 rows 5- c - isolepis p. 38. 



i. Cylindrophis rufus (Laur.). 



Anguis rufa, Laurenti, Syn. Kept. 1768, p. 71. 



Cylindrophis rufus, Boulenger, Cat. Sn. I 1893, p. 135 ( s - s Y n -> 



Diameter of the eye about half its distance from the nostril ; 

 the distance between the eyes more than the length of the 

 snout; nasals forming a suture; frontal at least as large as the 



Fig. 19. Cylindrophis rufus (Laur.) X Va- Lower view of head. X 4 /3- 



supraocular, larger than the parietals, as long as its distance 

 from the rostral or longer ; six upper labials, third and fourth 

 entering the eye. Scales in 19 or 21 rows; ventrals not twice 

 as large as the neighbouring scales, 185 245; anal divided; 

 subcaudals 5 10. 



