ll'l. r.u.v MARIA. 331 



'/isis of the fyecics. 

 1. li'ii to 225 ventrals. 



A. Five or six upper labials, third and fourth or fourth and fifth 

 filtering the eye. 



1. Frontal longer than broad. 



a. Symphysial in contact with the chin-shields. 



a. Frontal not twice as broad as the supraocular. 

 * Rostral broader than deep. 



Diameter of the eye less than its distance 



from the mouth 1. lumbricoidea, p. 333. 



Diameter of the eye equal to its distance 



from the mouth -2. vermiforrnis, p. 333. 



Diameterof the eye more than its distance 



from the mouth ; frontal shorter than 



the parietals 3. stahlknechtii, p. 335. 



Diameter of the eye more than its distance 



from the mouth ; frontal as long as 



the parietals 4. baluensis, p. 335. 



** Rostral as deep as broad. 



t Frontal as long as the parietals. 



Frontal once and two thirds as long as 



broad 5. grabowlni^ p. 336. 



Frontal once and a half as long as broad. 6. albiv enter, p. 336. 

 Frontal once and one third as long as 



broad .....*. 7. margaritifera, p. 336. 



ft Frontal shorter than the parietals. 



Ventrals 126-144 8. jvraJekii, p. 337. 



Ventrals 175-195 9. grayi, p. 338. 



/3. Frontal at least twice as broad as the supraocular. 

 Rostral as deep as broad ; frontal as long 



the parietals 10. bitorque*, p. 338. 



Rostral as deep as broad ; frontal shorter 



than the parietals 11. gervaisii, p. 338. 



Rostral a little broader than deep ; frontal 



a little shorter than the parietals .... 12. sumatrana, p. 339. 



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



symphysiaL 



a. A pneocular ; a postocular. 



* Frontal not more than twice as broad as the supra- 

 ocular. 



t Diameter of the eye much more than its distance 

 from the mouth. . 13. tverdti, p. 340. 



