4. hyla. 367 



34. Hyla quadrangulum. (Plate XXV. fig. 2.) 



Tongue circular, entire, and slightly free behind. Vomerine, teeth 

 on a level with the hinder edge of the choanae, 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. Prom snout to vent 58 millim. 



Ecuador. 

 a. $ . W. Ecuador. Mv. Fraser [C.]. 



35. Hyla coriacea. 

 Hyla coriacea, Peters, Mori. Berl. Ac. 1867, p. 711. 



Tongue subcircular, indistinctly emarginate, and slightly free 

 behind. Vomerine teeth a little behind the level of the choanae, 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, 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. 



a - ? • Surinam. Herr Kappler [C.]. 



