128 



B. Scales in 15 rows. 

 I. Anal entire. 



a. Nasal divided. 



1. Internasals in contact 4. (9. everetti p. 130. 



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



b. Nasal undivided 6. O. fropinquus p. 131. 



II. Anal divided. 



a. No internasals. 



1. Nasal divided; two postoculars; sub- 



caudals 30 "]. 0. fiilcherriiims p. 132. 



2. Nasal undivided; one postocular; sub- 



caudals 37 8, 0. pracfrontalis p. 132. 



h. A pair of internasals. 



1. Nasal divided; subcaudals 54 9. 6>. vertebralis p. 133. 



2. Nasal undivided or partly divided; sub- 

 caudals 21 — 28 10. C. ivaandersi p. 133. 



I. Oligodon bitorquatus Boie. 



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



Oligodon hilorqva/iis^ 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; 



J.TTObbea. 



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 



