NO. 39. — 1889.] ZOOLOGICAL TABLES. 



207 



5. — Two superimposed anterior temporals ; frontal as long 

 as its distance from the rostral ; no chin shields ; 

 rostral as deep as broad. 52 D. stokesii. 



t). — A single large anterior temporal descending to the 

 labial margin ; frontal nearly as long as its distance 

 from the end of snout ; chin shields, two pairs in 

 contact. 53 D. jerdonii. 



7. — As in p ; rostral broader than deep. 54 D. robusta, 



8. — As in f 1 ; two superimposed anterior temporals. 55 



D. cyanocincta. 



9. — As in f 1 ; two or three superimposed anterior tem- 



porals ; posterior chin shields, if distinct, separated 

 by scales. 56 D. ornata. 



G — 4 Cylindrophis maculatus. 



A pair of very large contiguous nasals cover the snout, 

 succeeded by a pair of anterior frontals, which are in 

 contact with the labials and form anterior margin of 

 orbit. 4 C. maculatus. 



H = 6 Rhinophis oxyrhyncus. 



Head shields scale-like or slightly imbricate ; rostral 

 very large, produced backwards ; a pair of anterior 

 frontals ; a single ocular shield ; no mental groove or 

 chin shields. 



1. — -Rostral strongly keeled, half as long as shielded part 



of the head. 6 R. oxyrhyncus. 



2. — Rostral obtusely keeled, not half as long as shielded 



part of the head. 7 R. planiceps ; 8 R. trevylanus ; 

 9 R. blythii.' 



3. — Rostral convex. 5 U. grandis. 



J = 40 Cerberus rhyncops. 



Occiput scaly ; internasals small ; nasals anterior, 

 superior, contiguous ; lower margin of orbit formed 

 by an infra-ocular shield. 40 C. rhyncops. 



