1854.] 



87 



small, elongate, posteriorly free for the fourth of its length. A subgulav vocal 

 bladder. Tympanum of medium size. Parotids subovoid, of stoutish appear- 

 ance. Limbs of moderate development. First finger much longer than the 

 second, which is equal to the fourth. A large subcircular metacarpal disk. 

 Toes semipalmated. Two metatarsal spade-shaped processes, the innermost 

 being much the largest. A membranous fold at the inner lower margin of tar- 

 sus. Skin above covered with papillae of moderate development, and with small 

 warts beneath. Color above greenish brown, maculated: no dorsal lighter 

 vitta. Beneath, greenish or yellowish white, unicolor. 



Allied to B. woodhousii, differing, however, in the form and development of 

 the metatarsal processes. It appears to inhabit the valley of the Rio Bravo 

 (Rio Grand del Norte), and to be not uncommon in the province of New Leon. 



6. Bufo punctatus, B. and G. Acad. Nat. Sc. Philad. vi. 1852, 173. 



A very marked species in the shape and structure of the head. Hitherto 

 found in the valley of the Devil's river (Rio San Pedro, of Rio Grande), and in 

 the province of Coahuila, Mex. 



7. Bufo debilis, Girard. Upper surface of head without any crest or ridge. 

 Snout rounded. Mouth moderate. Upper jaw emarginated. Tongue small. 

 Tympanum small. Parotids moderate and elongated. Limbs of moderate de- 

 velopment, femur shorter than tibia. First finger longer than the second. A 

 large metacarpal disk. Toes slightly united at base by a web. Two metatar- 

 sal processes. No membranous fold at the inner lower margin of the tarsus. 

 Skin above pustulous; pustules of moderate development; warts beneath 

 very small. Color above brownish yellow, spotted. No dorsal lighter vitta. 

 Beneath of a uniform soiled yellow. 



Allied to B. speciosus ; found in the lower part of the valley of the Rio 

 Bravo ^Rio Grande del Norte), and in the province of Tamaulipas. 



8. Bufo nebulifer, Girard Bufo granulosus, B. and G. (non Spix). Proc. 

 Acad. Nat. Sc. Philad. vi. 1852, 173. 



This species is strongly suggestive of B. mariuus, Schn. (B. agna Daud) ; it 

 is, however, easily distinguished from it upon a comparison of individuals of 

 both species. It inhabits Texas, the valley of the Rio Bravo (Rio Grande del 

 Norte), the provinces of Tamaulipas and New Leon, Mexico. 



9. Bufo columbiensis, B. and G. Proc. Acad. Nat. Sc. Philad. vi. 1853, 

 378. 



This is possibly the largest species of North American toads; it is common in 

 the valley of the Columbia River, Oregon Territory, where it was first observed 

 by the naturalists of the U. S. Exploring Expedition under Capt. C. Wilkes. 



10. Bufo boreas, B. and G. Proc. Acad. Nat. Philad. vi. 1852, 311. 



So far the most northern bufonid ; it is not uncommon about Puget Sound, 

 where it was collected many years ago by the naturalists of the U. S. Explor- 

 ing Expedition. 



11. Bufo halophila, B. and G. Proc. Acad. Nat. Sc. Philada. vi. 1853, 

 311. 



Since this species was first described an adult individual has been secured, 

 which has enabled me to give the following diagnosis : 



Upper surface of head without either crests or grooves. Skin thick and adhering 

 to skull. Snout rounded. Parotids of medium size. Ryes moderate. Tym- 

 panum small. Tongue lanceolated, bro.idest posteriorly. Upper jaw emargi- 

 nated. Inner finger longer than the second. Two metacarpal disks. A mem- 

 branous fold along the tarsus. Toes semipalmated ; two metatarsal tubercles. 

 A narrow yellowish dorsal vitta. Ground color greenish yellow, with nume- 

 rous black spots and dots, distributed all over the upper parts and sides of body, 

 head and limbs. Beneath unicolor of a dingy yellow. 



Inhabits the western coast, frequenting the sea margin ; hitherto observed 

 only in California. 



