Hinckley.] 
312 
[January 4, 
That the four tadpoles having three fringed folds on the under 
lip are more nearly related to each other than to R. silvatica 
seems evident, but to arrive at a conclusion as to the place they 
really hold is scarcely possible here. Now taking the adult forms, 
we find in R. catesbeiana, R. fontinalis, R. palustris, and R. hal- 
ecina, four water frogs, of which R. catesbeiana is the most aqua- 
tic in habit, R. fontinalis stands next and R. palustris and R. hal- 
ecina are the least so. In R. silvatica we have a land frog widely 
separated from the other frogs in habit. It is only during the 
short period of egg-laying that these frogs remain at the water 
and as soon as that is over they disperse to the land. In this 
locality R. silvatica is commonly seen during the summer in the 
woods among the brown fallen leaves, especially in groves of oaks 
and pines. R. silvatica is smaller in size, more delicate in struc- 
ture and endures a lower temperature than either of the other 
species, appearing first in the spring and disappearing last in the 
autumn. Separating these frogs according to their habits, we 
have one land frog and a group of four water frogs, a division 
which corresponds with that expressed by the mouth structure of 
the tadpoles. 
In the Hylidae we have two tadpoles, Hyla versicolor, our com- 
mon tree frog, and Hylodes pickeringii, the small, brown, peeping 
frog, whose voice is such a feature here in early spring. The dif- 
ference between these mouths is in the fringed folds on the under 
lip. The tadpoles agree in having under the upper lip one fringed 
fold running parallel with the curves of the lip, with a gap above 
the upper jaw. On the under lip of H. versicolor (fig. 4) are 
three fringed folds which frequently present a wavy line ; the 
middle fold is sometimes divided midway its length. The edge 
of the upper lip is occasionally scalloped or extended so as to 
form a small point between the curtains of the lip. 
With the tadpoles of H. pickeringii (fig. 5) there- are but two 
fringed folds on the under lip with a short space of fringe 
inserted at the edge of the border ; this section of fringe usually 
occurs midway the under lip, but it is not constant in its position, 
exact number of teeth, or presence; occasionally it may be 
found a little to the right or left of the middle of the mouth, 
and now and then it does not appear at all. Wherever the 
