4. BuJo. 285 



Tympanum absent ; no tarsal fold ; first 



finger not longer than second 18. variegatus, p. 293. 



Tympanum distinct, half the width of 



the eve 23. lialojihihis, p. 295. 



Inner metatarsal tubercle very large, 



shovel-shaped 33. compact d is, p. 302. 



Tympanum hidden : no tarsal fold ; first 



finger longer than second 34. simus, p. 302. 



Tympanum distinct, very small ; paro- 



toids short 35. S2niiidosus, p. 302. 



3. Toes entirely Avebbed, or nearly so. 



Skin perfectly smooth 15. politu.s, p. 292. 



Skin warty 24. horeas, p. 296. 



B. Head with bony ridges. 



1. A tympanum. 



a. Upper eyelid normal. 



a. Supraorbital and postorbital ridges straight, forming 

 together a right angle. 



* Derm of head free from cranial ossification. 

 Parotoids close to the eye ; metatarsal 



tubercles blunt 43. intermecUns, p. 307. 



Parotoids close to the eye ; metatarsal 



tubercles shovel-shaped 44. dipternus, p. 308. 



Tympanum large, very distinct 45. lentiginosus. p. 308. 



Tympanum small ; toes nearly entirely 



webbed 40. occqjitalis, p. 310. 



Tympamim hidden ; 54. hocourtii, p. 314. 



Tympanum distinct, half the size of the 



eye ; toes extensively webbed 04. conifenis, p. 321. 



** Derm of head involved in cranial ossification. 



Tympanum at least half the width of the 



eye 74. [jeJtocepludas, p. 325. 



Temporal region entirely bony, the tym- 

 panum being a mere foramen perfora- 

 ting a shield of bone 75. eminisus, p. 320. 



j3. Supraorbital and postorbital ridges forming together 

 a more or less regular curve, with the parietal 

 ridges (if present) a j^-shaped figure. 



* Edge of the upper jaw 



strongly dilated hori- 

 zontally 08. d'orhignyi, p. 322. 



** Angles of jaws projecting. 59. fi/p7ionias, -p. 317. 





