200 CTSTIGNATHIDiE. 



Tympanum one half the diameter of the " 



eye ; vomerine series not extending 



outwards beyond the external border 



of the choansB ; skin smooth 16. pkmirostris, p. 208. 



Tympanum one hqlf the diameter of the 



eye; vomerine series not extending 



outwards beyond the external border 



of the choanse; numerous glandular 



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



6. Head broader than the body. 



Vomerine teeth in two curved series . . 18. cuneatus, p. 209. 



Tympanum large; interorbital space 



plane, without ridges 19. laticeps, 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. pelviculus, p. 210. 



Tympanum one third the diameter of 

 the eye ; interorbital space with crest- 

 like lateral ridges ; back with dermal 

 folds 22. megacephalus, p. 211 . 



Tympanum one third the diameter of the 

 eye ; interorbital space with crest-like 

 lateral ridges; back without dermal 

 folds 23. gulosus, p. 211. 



2. Tympanum indistinct; eustachian tubes minute. 



Tibio-tarsal articulation reaching beyond 



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



B. BeUy slightly granular. 



No tympanic disk; eustachian tubes 



minute 2b.' surdv^, p. 212. 



Tympanum distinct, small ; upper sur- 

 faces tubercular 26. glandulosus, p. 212. 



Tympanum distinct, small; ifronto-pa- 



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



0. 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 body with granuUform warts .... 28. ricordii, p. 213. 

 Disks small ; skin smooth above 29. oxyrliynchus, p. 213. 



