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 Hylaversicolor (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 z\ 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 light bands; colour plain green above, white below. 

 Virginia,_Maryland. 



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



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



mediate edge of jaw dark). 



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



prominent; back marked with evanescent pattern of 



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



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



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



rostralis well marked, but not sharply angled; back marked 

 with evanescent pattern of rounded spots; size i| 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. 



(i) A light line 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 nigritus. (See p. 157.) 



47 



