THE BATRACHIA OP NOETH AMERICA. 369 



HYLA ARENICOLOR Cope. 



Jourii. Ac. Pbila. (2), 186G, p. 84. 



H. affinis Baircl (uou spixii), Proceed. Ac. riiila., 1854, 61 ; U. S. Mes. Bonud. 



Surv,, Reptil., p. 29, PI. xxxviii, figs. 4-7. 

 Hyla copii Boulanger Annals and Magazine Nat. History, 1887, p. .53 ; 1888, p. 189. 



Head short, wide, entering the length three and a half times. Muz- 

 zle regularly broadly rounded, not projecting beyond premaxillary 

 border, as long on the side as the length of the eye fissure. ISTostrils 

 terminal, near the superior plane of the muzzle. Tympanum very dis- 

 tinct, its diameter two-thirds that of the eye fissure. Tongue discoid, 

 very openly emarginate behind. Choanoe small; the vomerine teeth in 

 a pair of transverse fascicles exactly between them. Ostia i^haryngea 

 of Eustachian tubes about equal to the choanee. 



Integument with numerous scattered small tubercles, above and on 

 the limbs. Gular region areolated, as well as belly. Fingers free, the 

 first considerably shorter than the second. Pallettes moderate, one-third 

 the area of the tympanum. Hind legs moderate ; when extended, the 

 heel marks the anterior part of the orbit. The extent of the web is 

 somewhat variable, in some specimens leaving only two phalanges of 

 the fourth toe free, while in others two are free on the outer side and 

 three on the inner; while others display intermediate conditions. The 

 pallettes are about the size of those of the hand. The internal metatar- 

 sal tubercle is small but distinct; a narrow tarsal fold, which is in- 

 curved proximally. The length of the arm from the elbow is less than 

 that of the tibia, but is greater than the hind foot. 



The. general tint of color is much as in H. versicolor. The blotches 

 on the back are, however, more numerous, and exhibit a tendency to 

 arrangement in two rows of nearly circular spots ; sometimes the serial 

 arrangement is not maintained. Owing to the greater length of thehind 

 legs, there are three transverse bars across the femur, tibia, and tarsus, 

 as well as a larger number on the metatarsus. The marbling, so con- 

 spicuous on the anterior and posterior faces of the hind legs, as well as 

 in the groin of R. versicolor, is here wanting. 



General aspect of ff. versicolor, having the same squat appearance, 

 the granulated skin above and below, the ash-color back with darker 

 mottlings, the white spot under the eye, etc. The most conspicuous dis- 

 tinctive features are the absence of webs of the fingers, the greater 

 length of the hind legs, and the blotches on the back being in round 

 spots, not cuneiform. The legs with three bars not two, and without 

 the reticulate markings behind and below. 

 1951— Bull. 34 24 



