284 BUFONID^. 



b. Orbito-tympanic ridges much developed, swollen. 



Toes entirely webbed 51. asper, p. 313. 



Toes not quite half webbed 52. celehensis, p. 313. 



Orbito-tympanic ridge coniiuent with the 



parotoid 53. galeaUis, 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. hiporcatus, p. 311. 



Tympanum hardly two thirds the width 



of the eye ; parietal ridges much 



swollen 48. clavir/er, p. 311. 



h. 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 . 40. diverge ns, p. 312. 



Tympanum two thirds the width of the 

 eye ; tarso-metatarsal articulation not 

 reaching beyond the tip of the snout . 50. jinrhtalis, p. 312. 



Tympanum very small ; first finger shor- 

 ter than second ; second and third 

 equal 01. dialophus, p. 319. 



II. American Species. 



A. Cranial ridges none, or indistinct. 



1. Toes very slightly wel)bed. 



!N"o tarsal fold ; tympanum small 1>. Jchili'^, p. 289. " 



A thin tarsal fold ; skin smooth ; tarso- 

 metatarsal articulation reaching be- 

 yond the tip of the snout I", lia uuitiHcns, p. 290. 



A rather indistinct tarsal fold ; tympa- 

 num two thirds the width of the eye; 

 tarso-metatarsal articulation marking 

 the eye 11. gxdtatus, p. 290. 



A tarsal fold ; tympanum hidden 13. cceridenstictiis, p. 201 . 



2. Toes one-third or half webbed. 



Skin perfectly smooth 12. filaherrimva, p. 291. 



Tympanum scarcely perceptible ; a late- 

 ral dermal fold 14. diptijchus, p. 292. 



Tympanum concealed ; lores vertical . . 10. monlcsice, p. 292. 

 Tympanum large, very distinct 17. mexkanus, p. 293. 



