Key 



d. Muzzle rounded, projecting but slightly beyond the jaw; no light 

 spot under eye, nor distinct line along jaw; fingers slightly 

 webbed; there may be a pattern of spots and bars similar to 

 that of Hyla versicolor (Fig. 134); size i^ inches. Southeastern 

 United States. 



Hyla jemoralis. (See p. 150.) 



2. Posterior surface of femur not spotted. 



a. Frog long and slender; colour plain, i. e. no evanescent pattern of 



spots and bars on head, back, and legs; size if to 2 J inches. 

 ' (i) Light bands from the muzzle along the sides, also on the tibiae. 

 Southern North America. 



Hyla cinerea. (See Colour Plate X, also p. 126.) 



(2) No hght 'bands; colour plain green above, white below. 

 Virginia,^Maryland. 



Hyla evittata. (See Fig. 161, also p. 128.) 



b. Frog not unusually long and slender; light line along jaw (im- 



mediate edge of jaw dark). 



(i) Form robust; head thick through; canthus rostralis very 



prominent; back marked with evanescent pattern of 



bands and elongated spots; size ij inches. Pacific Slope. 



Hyla regilla. (See Colour Plate VIII, also p. 134.) 



(2) Form more deHcate; head not so thick through; canthus 

 rostralis well marked, but not sharply angled; back marked 

 with evanescent pattern of rounded spots; size ij inches. 

 Southern United States. 



Hyla squirella. (See Colour Plate X, also p. 148.) 



II. Disks on fingers and toes so small that they are scarcely discernible. 



A. Skin rough; webs very large; muzzle long and pointed; legs long; size 



I inch or less. North America, east of Rocky Mountains. 



Acris gryllus. (See Fig. 184, also p. 153.) 



B. Skin smooth; webs minute, or lacking. 



1. Muzzle truncate in profile, long, slender; upper jaw edged with white; 



legs very long; size under i inch. Southeastern United States. 



Chorophilus ocularis. (See p. 162.) 



2. Muzzle rounded in profile, slightly projecting beyond line of jaw. 

 a. Posterior surface of femur unspotted. 



(1) A light hne along jaw; usually longitudinal bands on back, the 

 middle one forking posteriorly; size i inch, or slightly more, 

 (a) Leg to heel equals total length. 

 Head long. 



Chorophilus nigriius. (See p. 157.) 



47 



