4, BUFO. 285 
Tympanum absent; no tarsal fold; first 
finger not longer than second ...... 18. variegatus, p. 293. 
Tympanum distinct, half the width of 
BHE OY OL dou sl eenepmmneeraet aes 23. halophilus, p. 295. 
Inner metatarsal tubercle very large, 
shoyel-shaped...*.-:.-.temiarn greets 33. compactilis, p. 302. 
Tympanum hidden: no tarsal fold ; first 
finger longer than second .......... 34. sinus, p. 302. 
Tympanum distinct, very small; paro- 
HOLES SHOLU sin "a\s' ss 5: No, Peer ee 39. spunulosus, p. 302, 
3. Toes entirely webbed, or nearly so. 
Skin.perfectly smooth via. Jit. ceeeee 15. politus, p. 292. 
ROMA WAELY?..¢ chassis, dcr les are eee 24. boreas, p. 296. 
B. Head with bony ridges. 
1. A tympanum. 
a. Upper eyelid normal. 
a. Supraorbital and postorbital ridges straight, forming 
together a right angie. 
* Derm of head free from cranial ossification. 
Parotoids close to the eye; metatarsal 
Pulserclesy PhunG: umiryt slices mos wae 43, intermedius, 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 
22 102) aaa ce Le, A er 46. oceipitalis, p. '310. 
Pympamim hidden ts <stie ~ ..c4- ssc geens 54. bocourtir, p. 314. 
Tympanum distinct, half the size of the 
eye; toes extensively webbed ...... G4, coniferus, p. 321. 
** Derm of head involved in cranial ossification. 
Tympanum at least half the width of the 
Sie ir x a aon PV pase ie eta ae 4 ae 74. peltocephalus, p. 325. 
Temporal region entirely bony, the tym- 
panum being a mere foramen perfora- 
tuiea: shieldyof Hone . ies... . a... 75. empusus, p. 326. 
(. Supraorbital and postorbital ridges forming together 
a more or less regular curve, with the parietal 
ridges (if present) a A-shaped figure. 
* Edge of the upper jaw’ 
strongly dilated hori- 
POWAY 3. Ss6 ore ee 68. Porhigiyt, p. 322. 
** Angles of jaws projecting. 59. typhonius, p. 317. 
