984 BUFONID. 
b. Orbito-tympanie ridges much developed, swollen. 
Toes entirely webbed .............- 51. asper, p. 313. 
Toes not quite half webbed .......... 52. celebensis, p. 313. 
Orbito-tympanic ridge confluent with the 
AMGUOU yeah eet ON aie sae ee oe ee 53. galeatus, p. 314. 
2, A parietal ridge. 
a. Supero-orbital and parietal ridges forming together a 
straight or nearly straight line, 
_ 
Tympanum as large as the eye ........ 47. biporeatus, p. 311, 
Tympanum hardly two thirds the width 
of the eye; parietal ridges much 
WVOMGH din eto iaee. ARE nee « a aiauerniam 48. claviger, p. 311. 
}. Supero-orbital and parietal ridges forming together an 
angle, 
Tympanum two thirds the width of the 
eye;  tarso-metatarsal articulation 
reaching beyond the tip of the snout . 49. divergens, p. 312. 
Tympanum two thirds the width of the 
eye; tarso-metatarsal articulation not 
reaching beyond the tip of the snout . 50. parietahs, p. 312. 
Tympanum very small; first finger shor- 
ter than second; second and third 
ERI ena adatle eats, ws, rede acy ey ore 61, dialophus, p. 319. 
II. AMERICAN SPECIES. 
A. Cranial ridges none, or indistinct. 
1. Toes very slightly webbed. 
No tarsal fold; tympanum small...... 9. debilis, p. 289. 
A thin tarsal fold; skin smooth; tarso- 
metatarsal articulation reaching he- 
yond the tip of the snout .......... 10. hematiticus, p. 290. 
A rather indistinct tarsal fold; tympa- 
num two thirds the width of the eye; 
tarso-metatarsal articulation marking 
(SOUS h Sh SR NPE RM Ar AUR IC Reine 6 or 7 11. guttatus, p. 290. 
A tarsal fold; tympanum hidden...... 3. ceruleostictus, p. 291, 
2, Toes one-third or half webbed. 
Skin perfectly smooth 277. .).\. mete 12. glaberrimus, p. 291. 
Tympanum scarcely perceptible; a late- 
ral dermal tere ei 05) fs. owes owns 14. diptychus, p. 292. 
Tympanum concealed; lores vertical .. 16. monksie, p. 292. 
Tympanum large, very distinet........ 17. mewicanus, p. 293. 
