BATRACHIANS OF THE VICINITY OF NEW. YORK 1095 
others to a bright tint of green. While the animal was in the 
green phase, the pattern on the back could not be discerned. 
The toes are provided with well-developed adhesive disks, 
or “suckers,’’ which are particularly distinct on the fore feet. 
The skin of the abdomen is coarse and granulated; that of the 
back is smooth. 
Male specimens of this species may be distinguished from 
the females by the loose, dark skin on the throat. This loose 
skin constitutes the vocal sac, an organ capable of great ex- 
FIG. 20. PICKERING’S TREE TOAD 
From specimen in New York Zodlogical Park 
pansion while the animal is uttering its shrill mating call. Length 
of body, 14 inches; total length, hind limbs outstretched, 2} 
inches. 
Range: The entire eastern and central portions of the United 
States, abundant. 
Local Distribution: Common, but not easily seen. 
Only three representatives of the genus Hyla are found in this 
vicinity.!| The species are easily distinguished from one another 
by their characteristic color-patterns, and from other tailless 
batrachians by their peculiar feet and the disks on the toes. 
1 One species, the Hyla andersoni, is of doubtful occurrence, although it is 
included in this Leaflet. 
