1. sCAPHIOPUS. 435 
rugose; tympanum concealed or distinct. Toes fully webbed; 
cuneiform shovel elongate. Skin tuberculous, sometimes rather 
smooth ; abdomen slightly rugose; parotoid flat. Yellowish or 
yellowish olive above, with brown bars. 
‘Tamaulipas; Rio 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 fasciculi behind the cho- 
ane. 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 hammondii, Baird, Rep. Expl. Surv. iv. Rept. 1859, pl. 28. 
f.2; Cope, Proc. Ac. Philad. 1863, p. 53. 
Spea hammondii, Cope, Jow'n. Ac. Philad. (2) vi. 1866, p. 81. 
Tongue very large, entire. Vomerine teeth in transverse series 
between the choanz. 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. 1863, p. 53. 
Spea bombifrons, Cope, Journ. Ac. Philad. (2) vi. 1866, p. 81. 
Tongue entire. Vomerine teeth in oblique fasciculi or short 
series between the choane. Snout truncate, elevated, thickened 
transversely ; canthus rostralis replaced by a concayity ; 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 yermiculations; outer border of tarsus and foot 
light ; a dark spot on canthus rostralis. 
Fort Union, Missouri; Platte River ; Texas. 
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