1882 .] 
31B 
[Hinckley. 
fringe occurs the papillae are wanting, and those mouths in 
which fringe does not appear here at all present an unbroken 
line of papillae along the edge of the border. This fringe is 
placed in a position similar to that in the tadpoles of B. ameri- 
canus and B. fowleri, but with the latter it occupies a much wider 
space. With H. pickeringii there is a tendency to carry the 
margin of the under lip turned upwards towards the mouth as 
is seen in the Bufonidae. 
Comparing the adult forms we find they differ markedly in 
habit. H. versicolor spends no more time at the water than is 
necessary for the purposes of egg-laying and at once returns to 
the trees, while H. pickeringii becomes aquatic for several weeks in 
the spring, after which it seeks the land and low bushes, its 
presence in trees being exceptional. H. versicolor by greater 
range of color-change, the ability to live amid less moisture and 
more sunlight, shows a more perfect adaptation to tree life than 
H. pickeringii with less range of color-change and the need of 
more humidity. These frogs differ in time of appearance in the 
spring and disappearance in the autumn. They agree in the color 
and manner of distribution of the eggs, but with H. pickeringii 
the latter are smaller. So alike are the tadpoles in the earlier 
stages of their existence that at this period the mouth furnishes 
an important point for determining the identity. In these larval 
forms we again encounter a difference in mouth structure fol- 
lowed by a difference of habit in the adult frogs. 
While this evidence may be insufficient to establish relation- 
ships, yet in determining the place occupied by the adult forms, 
these characters from the larval stages cannot be ignored. 
Note. After the above paper was written, my attention was called to 
a paper entitled, “ Sur les Caracteres fournis par la Bouche des Tetards 
des Batraciens Anoures d’Europe.” Par Heron-Rover et Ch. Van Bam- 
beke. Extrait du Bulletin de la Societe Zoologique de France. Seance du 
26 Avril 1881 . A comparison of some of the principal characters of the 
Hylidae, Ranidae and Bufonidae found in this locality, with those of the 
same families in Europe, results as follows : 
“ Levres externes et labre pectine. — Tous les Ranidae et tous les Bufonidae 
possedent un labre pectine. II manque chez les Hylidae.” Here, all the 
Ranidae (excepting R. catesbeiana, which has frequently both papillae 
