Viosca's Tree Frog. Whistling Tree Frog, 



. Bird-voiced Hyla. 



Plate XXXVIII. (xii). 



1-4. Males. 



Hyla avivoca Viosca. 



Range: Southeast Louisiana 

 (Florida Parishes of Louis- 

 iana) to Florida. (O. C. Van 

 Hyning, 1930). Georgia. (F. 

 Harper, 1932). 



Habitat: Tupelo swamps in 

 the valleys of rivers and 

 smaller streams on tupelo or 

 cypress trees and on button- 

 bush. (Adapted from Viosca, 

 1928). 



Size: Adults, 1 1/8-1 3/4 

 inches. (Males, 28-39 mm - 

 Females, 32-44 mm.). 



General appearance: These 

 frogs are a small edition of 

 our common tree toad, Hyla 

 v. versicolor. They may be 

 brown or green or gray, light 

 or dark. The arms and legs 

 are distinctly barred. There 

 is the characteristic light 

 yellow or white spot below 

 the eye. The color in the 

 groin and on the rear of the 

 legs is a pale yellowish green, 

 instead of orange as in Hyla 

 v. versicolor males. The throats 

 of these males are more or 

 less darkened with black 

 specks. The dark pattern on 

 the back consists of a bar 

 across the head and the eye- 

 lids and an irregular area on 

 the back, the bulk of the 

 pattern being near the rump. 

 The skin is moderately 

 smooth, in some being very 



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