376 HTLIDiB. 



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

 are females and those of the second are 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 the 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 esternal subgular vocal sac, covered by an ^-shaped fold of the 

 skin. From snout to vent 50 millim. 

 Brazil ; Uruguay ; Buenos Ay res. 



Hyla vauterii, Qiinth. Cat. p. 106. 

 Hyla vauterii, (Bibr.) Sell, Zool. Beagle, Rept. p. 45, pi. 19. f . 2 ; 

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



Agrees in every respect with H.pulohella 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 

 brownabove, 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. pulcheUa. From snout to vent 39 millim. 



Uruguay ; S. Brazil. 



a. 2 • Maldonado. 0. Darwin, Esq. [P.]. (Type.) 



52. Hyla nasixsa. 



Hyla nasica, Cope, Proe. Ac. PhUad. 1862, p. 354. 

 ? Hyla granulata, Peters, Mon. Berl Ac. 1871, p. 651. 



Tongue elliptic, scarcely emarginate. Vomerine teeth in two 

 transverse contiguous short rows between the choauEe. 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 



