194 REPTILES. 



8. Lycodon. Two nasals, nostril between; one loreal ; one 



(or two) anterior, two posterior oculars. Scales smooth, 

 not much imbricate, those of the vertebral line generally 

 not larger, in seventeen rows. East Indies. 



9. Isoscelis. Two nasals, nostril between; loreal elongate; 



no anterior, two posterior oculars. 



10. Leptorhytaon. Body round. One nasal, pierced by 

 the nostril ; loreal coming into the orbit ; one anterior, two 

 posterior oculars. India. 



11. Odontomus. Body compressed. One nasal, pierced by 

 the nostril ; loreal coming into the orbit ; one anterior, 

 two posterior oculars. India. 



12. Ophites. Scales keeled, those of the back equal; sub- 

 caudals bifid. East Indies. 



13. Cercaspis. Scales keeled ; subcaudals entire. Ceylon. 



14. Cyclocorus. Scales smooth, in seventeen rows ; sub- 

 caudals entire. Philippine Islands. 



1. Simocephalus, Gray. 



Body and tail very slender, compressed ; head large, oblong, 

 much depressed ; muzzle very broad, truncated in front, spa- 

 tulate ; eye moderate ; pupil subelliptical ; two nasals, nostril 

 between, large round, open ; one loreal, one anterior and one 

 posterior ocular ; scales of the sides elongate, lanceolate, sharply 

 keeled, of the vertebral series broad, six-sided, with two sharp 

 keels. Subcaudals two-rowed ; ventral plates slightly keeled. 

 Anterior teeth of both jaws longest. Western Africa. 



Heterolepis, sp., A. Smith, III. of S. Afr. note ; Dum. <y Bibr. 

 vii. p. 419. Simocephalus, Gray, MS. in Brit. Mus. 



The heads of our specimens and of Heterolepis capensis, 

 figured by Dr. Andrew Smith, exhibit as great difference in 

 form, as those of Dendrophis and Dryiophis. Not having spe- 

 cimens of Dr. Smith's snake in the Museum collection, we think 

 we are justified in applying to our specimens the generic deno- 

 mination which was given to them by Dr. Gray many years 

 since. 



1. Simocephalus poensis. 



Heterolepis po-Jnsis, A. Smith, III. of S. Afr. note, p. . Simo- 

 cephalus poensis, Gray, MS. in Brit. Mus. Heterolepis bica- 

 rinatus, (Schlegel) Dum. Sf Bibr. p. 422. 



Uniform blackish brown above, paler beneath. 



