AMPHIBIA AND REPTILIA OF COLORADO 57 



disks at the tips of the digits. At the same time quite a number of 

 species of this family have suffered a more or less complete loss of the 

 webbing between the digits. Some species are neither arboreal nor 

 aquatic but are rather terrestrial in habit. Tree frogs are found in 

 many parts of the world but the majority of species are natives of the 

 tropics of the New World. Two species belonging to genera restricted 

 to North America are found in Colorado. 



a. Fingers and toes almost free, webbing greatly reduced; skin smooth. 



Chorophilus Baird. 

 aa. Toes rather completely webbed; skin rough. 



b. Terminal digital disks very small . . Acris Dumeril et Bibron. 

 bb. Terminal digital disks quite prominent. . . Hyla Laurenti. 



Genus CHOROPHILUS Baird 



Chorophilus Baird, Proc. Acad. Nat. Sci. Phila., p. 59, 1854. 

 A single species of this genus is known from the state. 



Chorophilus triseriatus (Wied) 



Three-Lined Tree Frog 



Hyla triseriata Maximilian, Prinz zu Wied, Reise Nord-Amerika, Vol. I, 

 p. 249, 1865. 



Chorophilus triseriatus triseriatus — Yarrow, Wheeler Survey, Vol. V, pp. 523 

 and 524, 1875 (Ft. Garland, Fairplay and Pagosa, Colo.); Yarrow, U.S.N.M. 

 Bull. 24, p. 170, 1882 (Fairplay and Pagosa, Colo.). 



Chorophilus triseriatus — Cope, U.S.N.M. Bull. 34, pp. 343, 347, 1889 (Laramie 

 River; Fairplay and Pagosa, Colo.); Cary, N. Am. Fauna, No. 33, p. 27, 1911 

 (Rangeley and ten miles east of Slater, Colo.). 



Head much depressed, somewhat pointed anteriorly, rather long, 

 its width about 3 in the total length ; length of the hind leg to the heel 

 reaching forward to the ear; total length of the head and body about 

 1 . 5 in the total length of the hind limb ; size small, length less than 

 1 . 5 inches; males with a gular sac. 



Color quite variable, gray, green, brown, or even reddish ; usually 

 with three dark stripes, or at least the indications of three stripes, 

 one in the mid-dorsal region, and one on each side beginning at the 



