376 HYLIDE. 
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 external subgular vocal sac, covered by an ~-shaped fold of the 
skin. From snout to vent 50 millim. 
Brazil; Uruguay; Buenos Ayres. 
~ 
a-b. 9 & yg. Maldonado. C. Darwin, Esq. [P.]. (Types 
of Hyla agrestis.) 
c-e. 2. Monte Video. Dr. Cunningham [P.]. 
Ff. 9 ,skeleton. Monte Video. 
g-t. 3. Soriano, Uruguay. © — Havers, Esq. [P.]. 
k. 3. Buenos Ayres. Ernest Gibson, Esq. [P.]. 
L-m. Her. Buenos Ayres. K. W. White, Esq. [C.]. 
51. Hyla vauteri. 
Hyla vauterii, Giinth. Cat. p. 106. 
Hyla vauterii, (Bibr.) Bell, Zool. Beagle, Rept, p.45, pl. 19. £.2; 
Hensel, Arch. f. Naturg. 1867, p. 157. 
Agrees in every respect with H, pulchella 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 //. pulchella. From snout to vent 39 millim, 
Uruguay; 8. Brazil. 
a. 9. Maldonado. C. Darwin, Esq. [P.]. (Type.) 
52. Hyla nasica. 
Tyla nasica, Cope, Proc. Ac, Philad. 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 choane. Head small 
as long as broad; snout depressed, prominent, faint. Fingers face 
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 I, vauteri, but the head is smaller, narrower, and 
