4, HYLA. 367 
34. Hyla quadrangulum. (Puare XXV. fig. 2.) 
Tongue circular, entire, and slightly free behind. Vomerine, teeth 
on a level with the hinder edge of the choane, in a nearly straight 
interrupted series. Head moderate, broader than long; snout short, 
rounded, slightly longer than the diameter of the orbit; canthus 
rostralis moderately distinct, slightly curved; loreal region concave ; 
interorbital space a little broader than the upper eyelid; tym- 
panum very distinct, half the diameter of the eye. Three outer 
fingers half webbed; no projecting rudiment of pollex ; toes three- 
fourths webbed; disks as large as the tympanum; subarticular 
tubercles rather small, not very prominent; no tarsal fold. The 
hind limb being carried forwards along the body, the tibio-tarsal 
articulation marks the front of the eye. Skin of head ‘and back 
_ thick, minutely pitted; lower surfaces granulate ; a fold above the 
tympanum. Greyish olive above; a large quadrangular dark-brown 
spot begins between the eye and ends on the sacrum; other dark- 
brown spots on the sides and the hind part of the back; a blackish 
line along the canthus rostralis; limbs regularly cross-barred ; 
beneath dirty white, immaculate. From snout to vent 58 millim. 
Ecuador. 
a. W. Ecuador. Mr. Fraser [C. ]. 
35. Hyla coriacea. 
Hyla coriacea, Peters, Mon. Berl. Ac. 1867, p. 711. 
Tongue subcireular, indistinctly emarginate, and slightly free 
behind. Vomerine teeth a little behind the level of the choane, in 
a nearly straight interrupted series. Head moderate, broader than 
long; snout short, rounded, slightly longer than the diameter of the 
orbit; canthus rostralis mpderately distinct, straight; loreal region 
slightly grooved ; interorbital space a little broader than the upper 
eyelid; tympanum very distinct, not quite two thirds the diameter 
of the eye. Three outer fingers extensively webbed, the membrane 
reaching the disks of the second and fourth, the penultimate pha- 
lange of the third; no projecting rudiment of pollex; toes webbed 
to the disks; latter as large as the tympanum; subarticular 
tubercles small, not very prominent; no tarsal fold. The hind 
limb being carried forwards along the body, the tibio-tarsal articu- 
lation marks the front of the eye. Skin of head and back thick, 
leathery minutely pitted; sides largely areolate; lower surfaces 
granulate ; a fold above the tympanum. Chestnut-brown above ; 
a narrow light line forms a hourglass-shaped figure beginning 
between the eye and ending on the sacrum; behind this a few 
transverse light lines; axilla black; lower surfaces brownish white, 
immaculate. Male with two large external vocal vesicles, each 
being situated behind the angle of the mouth. From snout to 
vent 62 millim. 
Surinam. 
@ 9. Surinam. Herr Kappler [C.]. 
