t28 



B. Scales in 15 rows. 

 I. Anal entire. 



a. Nasal divided. 



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



2. Internasals separated 5. <5. pctronellac p. 131. 



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



II. Anal divided. 



a. No internasals. 



1. Nasal divided; two postoculars; sub- 



caudals 30 1-0. pnlcherrhmts p. 132. 



2. Nasal undivided; one postocular; sub- 



caudals 37 %. 0. praefro/2 talis p. 132. 



!>. A pair of internasals. 



1. Nasal divided; subcaudals 54 9. f. vcrtehralis p. 133. 



2. Nasal undivided or partly divided; sub- 

 caudals 21 — 28 \o. O. ivaandersi p. 133. 



I. Oligodon bitorquatus Boie. 



Oligodon /'itorqiiatJis^ Boie, Isis 1827, p. 519. 



Oligodon hitorqiiatiis^ Boulengei', Cat. Sn. 11 1894, p. 237 (s. syn.). 



Rostral visible from above; nasal divided; suture between 

 the internasals shorter than that between the praefrontals; 



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 



