SNAKES. 163 



2. Leptodeira. Head triangular, depressed, broad, distinct 



from neck.; rostral moderate; one anterior ocular ; loreal 

 not reaching the orbit. Scales of the vertebral line not 

 larger. S. America ; S. Africa. 



3. EuDiPSAS. Head triangular, depressed; scales of the ver- 



tebral line larger ; anterior palatine and maxillary teeth 

 longer than the following. South America ; East Indian 

 Islands. 



4. DiPSAS. Head triangular, depressed; scales moderately im- 



bricate ; those of the vertebral line larger ; subcaudals 

 two-rowed ; no longer anterior teeth. Tropical parts of 

 the globe. 



5. DiPSADOMORPHUS. Scalcs very much imbricate. East 



Indies; Mexico. 



6. Rhixobothryum. Rostral very large, rounded, far pro- 



duced backwards. South America. 



7. Leptognathus. Head quadrangular, not depressed ; scales 



smooth, those of the vertebral line larger ; teeth equal. 

 Warmer parts of America. (India.) 



8. Tropidodipsas. Head subquadrangular, broader behind, 



distinct from neck ; scales keeled. Mexico. 



9. Hemidipsas. Head triangular, broad, distinct from neck ; 



rostral moderate ; loreal united with lower ocular ; a second 

 upper ante-ocular ; scales of the vertebral line not larger. 

 South America (?). 



10. Dipsadoboa. Head triangular, depressed ; subcaudals en- 



tire. Central America ; West Africa. 



11. Amblycephalus. Head high, rounded; subcaudals en- 



tire. Java. 



12. Pare AS. Head rounded, snout exceedingly short; sub- 



caudals bifid ; anterior palatine and mandibularj' teeth 

 longest. Java. 



1. Thamnodynastes, Wagler. 



Dipsas with body and tail of moderate slenderness ; head 

 rather elongate, depressed, not very distinct from neck ; vertical 

 narrow ; one loreal ; scales lanceolate, moderate, in seventeen or 

 nineteen rows ; those of the medial dorsal row not larger, similar 

 to the others. Anal and subcaudals bifid. Pupil subelliptical. 



