37G HYLID2E. 



simply sexual characters, as all the specimens of the first variety 

 arc females and those of the second arc males. In the former, the 

 upper surfaces are greenish, immaculate ; a -white, beneath black- 

 margined streak extends from the eye to the groin, and another 

 along tbe outer side of the tibia. In the latter variety, the upper 

 surfaces are brownish, spotted or marbled with darker ; the white 

 streaks on the sides of the body and legs are not distinguishable, 

 and the sides of the head and body are darker, especially on the 

 loreal and temporal regions. In both varieties the upper lip is 

 white-margined, at least from the vertical of the eye, and the groin 

 and the sides of the thighs are spotted with deep black. Male with 

 an external subgular vocal sac, covered by an -^-shaped fold of the 

 skin. From snout to vent 50 millim. 

 Brazil ; Uruguay ; Buenos Ay res. 



a-b. $ & yg. Maldonado. C. Darwin, Esq. [P.]. (Types 



of llyla ar/restis.) 



c~e. 5 . Monte Video. Dr. Cunningham [P.]., 



f. 5 , skeleton. Monte Video. 



'^_j, g j . Soriano, Uruguay. — Havers, Esq. [P.]. 



h. S • Buenos Ayres. Ernest Gibson, Esq. [P.]. 



l-m. Hgr. Buenos Ayres. E. W. White, Esq. [C.]. 



51. Hyla vauteri. = t$- /i^^^^^^. 



Hyla vauterii, Gilntlt. Cat. p. 106. 

 Hyla vauterii, \Bibr.) Bell, Zool. Beagle, Mept. p. 45, pi. 19. f. 2 ; 

 Hensel, Arch. f. Naturg. 1867, p. 157. 



Agrees in every respect with H. pulcliella but in the position of 

 the vomerine groups ; these are rather oblique, forming together a 

 very open chevron the point of which is turned forwards. Reddish 

 brown above, spotted with darker ; a dark streak along the canthus 

 rostralis, and a dark band on the temporal region ; groin and thighs 

 spotted as in H. pidchella. From snout to vent 39 millim. 



Uruguay ; S. Brazil. 



a. 2- Maldonado. C. Darwin, Esq. [P.]. (Type.) 



52. Hyla nasica. 



Hyla nasica, Cope, Proc. Ac. Philad. 1862, p. 354. 

 PHyla granulata, Peters, Mon. Bed. Ac. 1871, p. 651. 



Tongue elliptic, scarcely emarginate. Vomerine teeth in two 

 transverse contiguous short rows between the choana). Head small, 

 as long as broad ; snout depressed, prominent, faint. Fingers free 

 or nearly so. Skin above slightly tuberculous. Above dark rufous- 

 brown, with some darker longitudinal markings on the back ; a dark 

 band from snout through tympanum to side : femur and posterior 

 lateral region varied with dark brown : beneath pale, uniform. 

 From snout to vent 1 inch 5 lines. 



Resembles //. vauteri, but the head is smaller, narrower, and 



