1. SCAPHIOPUS. V.io 



rugose ; tympanum concealed or distinct. Toes fully webbed ; 

 cuneiform sbovel elongate. Skin tuberculous, sometimes rather 

 smooth ; abdomen slightly rugose ; parotoid Hat. Yellowish or 

 yellowish olive above, with brown bars. 



Tamauhpas ; Ilio Grande ; Lower California. 



3. Scaphiopus rectifrenis. 



Scaphiopus rectifrenis, Cope, Proc. Ac. Philad. 1863, p. 53 ; Brocchi, 

 Miss. Sc. Mex., Batr. p. 27. 



Vomerine teeth in closely approximate fascicidi behind the cho- 

 anse. Snout prominent, truncate in profile ; canthus rostralis strong ; 

 loreal region nearly vertical ; upper surface of head bony, rough ; 

 tympanum concealed. Skin of head and body sparsely tuberculous ; 

 parotoids rather lateral ; a weak antepectoral fold. Above brown 

 or brownish grey, the tubercles tipped with brown ; a brown line 

 extends from each eye to sacrum, converging posteriorly. 



Tamaulipas ; Coahuila. 



4. Scaphiopus hammondii. 



Scaphiopus hauinioodii,^rt»Y/,i?^. Expl. Surv. iv. Sept. 1859, pi. 28. 



f. 2 ; Cope, Proc. Ac. Philad. 1863, p. 53. 

 Spea hammondii, Cope, Journ. Ac. Philad. (2) vi. 1866, p. 81. 



Tongue very large, eutirc. Vomerine teeth in transverse series 

 between the choanse. Snout somewhat truncate, perpendicular in 

 profile ; region of canthus rostralis concave ; tympanum distinct, 

 one fourth the extent of the eye. Metatarsal shovel produced. 

 Skin roughly tuberculous, especially on the sides, thick on the 

 occiput: parotoid flat, small; beneath nearly smooth. Colour 

 above stone-brown, with traces of two paler dorsal bands ; tubercles 

 fulvous-tipped ; extremities shaded with the same ; below whitish, 

 immaculate. 



California. 



5. Scaphiopus bombifrons. 



Scaphiopus bombifrons, Cope, Proc. Ac. Philad. 186S, p. 53. 

 Spea bombifrous, Cope, Journ. Ac. Philad. (2) vi. 1866, p. 81. 

 Tongue entire. Vomerine teeth in oblique fasciculi or short 

 Beries between the choanoe. Suout truncate, elevated, thickened 

 transversely ; canthus rostralis replaced by a concavity ; tympanum 

 concealed or scarcely visible. Palmation of toes deeply repand : 

 metatarsal shovel produced. Skin nearly smooth, roughest on the 

 sides ; parotoid flat, small. Pale ashen or brown above, with nume- 

 rous plumbeous vcrmieulations ; outer border of tarsus and foot 

 light ; a dark spot on canthus rostralis. 



Fort Union, Missouri ; Platte River ; Texas. 



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