THE BATRACHIA OF NORTH AMERICA. 



265 



Meaaurcmoiits of No. 2G23. 



Length of head aud body 040 



Length of head to posterior edges of tympana 008 



Width of head at x>osterior edges of tympana 013 



Length of fore ] imh from axlDa 020 



Length of posterior from groin 040 



Length of tibia 012 



Len gth of tarsus 009 



Length of remainder of foot 014 



The average size is less than that of the B. punctatus. 

 The color of the Bitfo debilis is a light ash. The small tubercles are 

 generally bhick, and are without the reel or yellow centers seen in the 

 B. punctatus. The limbs have narrow black cross-bands, or rather 

 wide incomx)lete black bands, with the pale center so large as to leave 

 only the black borders. The eyelids and parotoids are crossed by simi- 

 lar black lines. Below and concealed surfaces unspotted. 



The range of this species is much like that of the B. punctatus, but 

 it extends further east, Mr. Isaac found it on the upper Wichita in 

 Texas, and Mr. W. Taylor at San Diego in southwest Texas. It occurs 

 westward through northern Mexico and the southwest territories to 

 Guaymas, on the Gulf of California, It has not yet been found in 

 Lower California. It was originally brought from the valley of Mexico, 

 and the Smithsonian Institution subsequently received it from Mazat- 

 lan. Baird reports it from the lower Eio Grande. It is probably diag- 

 nostic of the Sonoran region. 



Bufo dehilis Gii-ard. 

 RESERVE SERIES. 



Catalogue 



No. of 



number. 



spec. 



2624 



1 



2020 



2 



2621 



6 



2627 



1 



5381 



1 



2019 



7 



Locality. 



Delaware Creek 



Cliihuabiia, Mexico . 

 Matamoros, Mexico . 

 M.atamoro.'!, Mexico . 



(?) 



Brazos River, Texas 



When 

 collected. 



From whom received. 



Dr. Thomas Webb .... 

 Lieut. B. Couch, U. S. A 

 Lieut. B. Conch, TJ. S. A 



R. Kennicott 



Dr. B. F. Shumard 



Nature of 

 specimen. 



Alcoliolic. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



BUFO ALVARIUS Girard. 

 Baird's Reptilia U. S. Mex. Bound. Snrv., ii, p. 26, PI. xvi, figs. 1-6. 



This very distinct species is as yet known from a single specimen, 

 which is preserved in the ISTational Museum. It has a general relation- 

 shiji to the B. punctatus, and also to the Cuban Peltaphryne peltacepliala 

 of Cuba. In its large size it equals the B. marinus. 



Head short and wide; muzzle obtuse and vertical in profile, not pro- 

 jecting beyond upi)er lip ; nares terminal lateral, the canthus rostralis 

 formiug a convex line from nares to the orbit. Front wide, superciliary 

 ridges obsolete at anterior third of orbit, moderatelv elevated behind 



