128 



B. Scales in 15 rows. 

 I. Anal entire. 

 a. Nasal divided. 



1. Internasals in contact 4. O. everetti p. 130. 



2. Internasals separated 5- - petronellae p. 131. 



b. Nasal undivided 



II. Anal divided. 



a. No internasals. 



1. Nasal divided; two postoculars; sub- 

 caudals 30 



2. Nasal undivided; one postocular; sub- 

 caudals 37 



b. A pair of internasals. 



1. Nasal divided; subcaudals 54 



2. Nasal undivided or partly divided; sub- 

 caudals 21 28 



6. 0. propinqiws p. 131. 



7. 0. pukherrimus p. 132. 



8. 0. praefrontalis p. 132. 



9. O. vertebralis p. 133. 

 10. O. ivaandersi p. 133. 



i. Oligodon bitorquatus Boie. 



Oligodon bitorquatus^ Boie, Isis 1827, p. 519. 



Oligodon bitorquatus, Boulenger, Cat. Sn. II 1894, p. 237 (s. syn.). 



Rostral visible from above; nasal divided; suture between 

 the internasals shorter than that between the praefrontals; 



VMI'il-! 



Fig- 53- Oligodon bitorquatus Boie. Nat. size. Side view of head; ventral shields. 



frontal longer than its distance from the tip of the snout, as 

 long as or shorter than the parietals; loreal more long than 



