332 PROCEEDINGS OF THE ACADEMY OF [1892. 



found on the level surface of the Plain ; the greater number being 

 derived from the region bordering it on the east, or the two great 

 canyons which traverse it. These are the Canyon Blanco, from 

 which issues the principal head stream of the Brazos ; and the 

 Canyon Paloduro, which is traversed by the Prairie Dog head of the 

 Red river. The Tule Canyon is a branch of the latter. 



This paper may be regarded as supplementary to one published 

 as Bulletin No. 17 of the U. S. National Museum in 1880, "On 

 the Zoological Position of Texas." 



■'o 



BATRACHIA. 



URODELA. 



Amblystoma tigrinum Green. 



This species is extremely abundant, according to Mr. Cummins, in 

 some permanent lakes on the Staked Plain near the Tule Canyon. 

 Numerous specimens were obtained at this locality, but I could not 

 find this or any other species of salamander elsewhere throughout 

 the region explored, although I examined carefully a number of 

 suitable localities. Mr. Cummins had previously obtained specimens 

 from a well which was sunk in the Staked Plain near Canyon Blanco, 

 and which either had a subterranean origin, or they were hatched 

 from eggs carried to the locality, as the latter was without water prior 

 to the sinking of the well. I obtained a specimen at Big Spring 

 which was said to have been taken in the neighborhood. 



SALIENTIA. 



Bufo debilis Girard. 



This species is rather abundant throughout the region traversed. 

 It is frequently found in the grass, where its green color aids in 

 concealing it. When in the water, its cry is like that of B. lentig- 

 mosus americanus, but is more feeble, and very " nasal." 



Bufo cognatus Say. 



First seen near the head waters of the Brazos, but not common 

 south of Tule Canyon. 



Bufo lentiginosus Shaw. var. 



A large specimen was obtained near Clarendon. The head is one- 

 fifth the length, as in B. I. ivoodhousei, but the cranial crests are as in 

 B. I. americanus. Not seen south of this point. 



