200 CTSTIGNATHID^. 



Tympanum one half the diameter of the 



eye ; vomerine series not extending 



outwards beyond the external border 



of the choanse : skin smooth 16. jilanirostris, p. 208. 



Tympanum one half the diameter of the 



eye; vomerine series not extending 



outwards beyond the external border 



of the choaniB ; numerous glandular 



lines along the back 17. hinofatus, p. 209. 



A. Head broader than the body. 



Yomerine teeth in two curved series . . 18. cimeaius, p. 209. 



Tympanum large ; interorbital space 



plane, without ridges 19. laiiceps, p. 210. 



Tympanum one fourth the size of the 

 eye : interorbital space plane, without 

 ridges 20. melanostictus, p. 210. 



Tympanum as large as the eye ; inter- 

 orbital space with crest-like lateral 

 ridges; back with dermal folds .... 21. liehimlus, p. 210. 



Tympanum one third the diameter of 

 the eye ; interorbital space with crest- 

 like lateral ridges ; back with dermal 

 folds 22. meciaceiylialvs, p. 21 i . 



Tympanum one third the diameter of the 

 eye ; interorbital space with crest-like 

 lateral ridges ; back without dermal 

 folds 23. gulosiis, p. 211 . 



2. Tympanum indistinct ; eustachian tubes minute. 

 Tibio-tarsal articulation reaching beyond 



the tip of the snout 24. diastema, p, 212. 



B. Belly slightly granular. 



No tympanic disk ; eustachian tubes 



minute 25. sunhis, p. 212. 



Tympanum distinct, small ; upper sur- 

 faces tubercular 26. glandtilosvs, p. 212. 



Tympanum distinct, small ; fronto-pa- 



rietals concave, with prominent ridges 27. devUlii, p. 213. 



C. Belly granular. 



1. Head moderate. 



a. Without serrated ridges. 



a. Vomerine teeth in a zigzag row across the palate. 



Disks moderate, transversely oval; head 



and bodj'^ with graniUiform warts .... 28. ricordii, p. 213. 

 Disks small ; skin smooth above 29. o.ryrhynchus, p. 213, 



