332 COLITBEIDiE. 



ft Diameter of the eye not more than its distance 

 from the mouth. 



Rostral as deep as broad ; first and second 



labials subequal in size 14. virgulaia, p. 340. 



Eostral nearly as deep as broad ; second 



labial larger than first 15. leucocfaster, p. 341. 



B-ostral much broader than deep ; anal 



divided 16. occipitalis, p. 342. 



** Frontal more than twice as broad as the supra- 

 ocular 17. bicolor, p. 342. 



jS. A prseocular ; postocular fused with the supraocular. 



18. lateralis, p. 342. 

 y. A prseocular ; two postoculars. 



19. heccarii, p. 343. 



S. No praeooular 20. rebentiscMi, p. 343. 



2. Frontal as broad as long ; rostral broader than deep. 



a. First lower labial in contact with its fellow behind the 

 symphysial. 



No prseocular 21 . agamensis, p. 343. 



A praeoeular 22. leticocephala, p. 344. 



6. Symphysial in contact with the chin-shields ; no prseocular. 



23. schlegelii, p. 345. 



B. Four upper labials, second and third entering the eye. 

 1. Frontal longer than broad. 



a. Symphysial in contact with the chin-shields. 

 u. A prseocular. 



Tail obtuse ; the portion of the rostral 



visible from above shorter than its 



distance from the frontal 24. linncei, p. 345. 



Tail obtuse ; the portion of the rostral 



visible from above at least as long as 



its distance from the frontal 25. horneensis, p. 347. 



Tail ending in a sharp point 26. benjaminsii, p. 347. 



/3. No prseocular 27. javanica, p. 347. 



b. First lower labial in contact with its fellow behind the 



symphysial. 



Frontal as long as the parietals, not twice 



as broad as the supraocular 28. brevis, p. 348. 



Frontal shorter than the parietals, at 



least twice as broad as the supraocular. 29. pavimentata, p. 348. 



2. Frontal as broad as long. 



First lower labial in contact with its 

 fellow behind the symphysial ; tail 

 rounded at the end 30. septentrionalis, p. 349, 



