58 



The changes are said to occur slowly. These changes of color enable it 

 to escape the notice of its enemies. These frogs appear to hibernate- 

 sometimes in the earth and sometimes in crevices in trees. 



Hyla squirella, Bosc. 



Squirrel Tree-frog. 



Hyla squirella, Bosc, 1802, 57, ii, 181 ; Holbrook, 1842, oi, iv, 123^ 

 pi. 30 ; Boulenger, 1882, 27, 398 ; Cope, 1889, ol, 363, with figures. 



A species of small size, the length seldom exceeding an inch and a 

 quarter. The body and limbs slenderer than in either 3. versicolor or 

 H. jyickeringii. The snout is somewhat pointed ; eyes prominent ; 

 tympanum about one-half the diameter of the eye. Vomerine teetb 

 between the choanse. Head broader than long. Fingers without web ; 

 toes half-webbed. Heel reaching in front of the eye. Skin of the 

 upper surface smooth ; of the belly, thighs, and sometimes of the chin 

 and throat, granulated. 



Color above in life said to be green ; below, white. In spirits, light 

 brown or purplish. There is a V-shaped mark joining the eyes and 

 several scattered spots of the size of the tympanum on the back. A 

 dark band from the snout to the eye, thence through the ear to the 

 shoulder. Below this there is a narrow light line. Limbs indistinctly 

 barred. 



The snout of this species is less projecting than in H. pickeiingii; the 

 tympanum larger and more distinct. 



Until recently this species has been known only from South Carolina 

 and west to Louisiana. Recently, however, a specimen was sent to 

 Professor Cope by Mr. Amos W. Butler, from Brookville, Indiana. 

 This gives a remarkable extension to the range of the species. 



Of this frog Holbrook says that it is found on trees, often seeking 

 shelter under the bark of such as are decayed. It frequently chooses 

 old logs for the place of its hibernation. He had often seen them about 

 old houses and under logs and boards. 



Hyla pickeringii, (Storer). 

 Pickering's Tree-frog. 



Hylodes 'pickeringii. Storer, 1839, 58, 240 ; Holbrook, 1842, 5^, iv, 

 135, pi. 34; Hyla 'pickeringii, LeConte, 1854, 1, 429, pi. 7; Boulenger, 

 1882, 27, 399 ; Cope, 1889, 51, 352, with figures. 



Head a little longer than broad ; snout rather pointed ; the canthus 

 rostralis distinct ; the loral region concave. Interorbital space wider 

 than the eyelid. Tympanum distinct, about half the diameter of the 



