AMPHIBIANS AND REPTILES. 97 
informs me that he heard a few during the springs of 1904 and 
1906. Dr. Dahlgren tells me he secured examples near Trenton, 
from the same locality where Dr. Abbott made his observations. 
Scaphiopus holbrooki Abbott, Am. Nat., XVIII, 1884, p. 1075. 
—Sherwood, Proc. Linn. Soc. N. Y., 1897-98, No. 10, p. 17. 
Scaphiopus holbrooku Cope, Bull. U. S. Nat. Mus., No. 34, 
1889, p. 208. 
Scaphiopus solitarius Holbrook, N. Am. Herp., Ed. 2, IV, 
1842, p. 109, Pl. 27.—Abbott, Geol. N. J., 1868, p. 804.— 
Abbott, Nat. Rambles, 1885, p. 476. 
Family HYLIDZE. 
The Tree Toads. 
Upper jaw toothed. Vertebrz proccelous, without ribs, sacral 
dilated. Fingers and toes free or webbed, their tips usually more 
or less with dilated disks, and bases swollen. Sternum cartilagi- 
nous. Pupil usually horizontal. Tongue usually slightly nicked, 
or entire. | 
A large family, especially characteristic of the vast forests of 
tropical America. They are remarkable for their varied and 
loud voices from early spring till frost. 
Key to the genera. 
a. Toes not webbed, free or nearly so. PSEUDACRIS 
aa. Toes webbed. 
b. Finger and toe disks small; fingers not webbed. ACRIS 
bb. Finger and toe disks round, conspicuous; fingers somewhat webbed. 
HYLA 
Genus Pseupacris Fitzinger. 
The Swamp Tree Toads. 
Pscudaeris triseriatus (Wied). 
PLATE 20. 
Swamp Tree Toad. 
Body rather long, head 22% in its length measured to end of 
trunk, and excluding hind legs; width 3% to 3. Vomerine teeth 
7 MU 
