AMPHIBIANS 165 



Key to the United States Genera of Hylidse 



ai Finger and toe disks conspicuous (Fig. 88) i. Hyla. 



a2 Finger and toe disks very small (Fig. 8q). 



bi Hind toes fully webbed : 2. .4 cris. 



b2 Hind toes slightly webbed 3- Pseudacris. 



I. Hyla Laurenti. Hind toes webbed; skin smooth in most species; 

 belly granulated; pupil round or horizontal: about 14 species in the 

 United States. 



Key to the United States Species of Hyla 



ai Eastern species. 



bi Fingers webbed at the base. 



Ci A white spot under the eye H. versicolor. 



Co No white spot under the eye H. Jemoralis. 



b2 Fingers not webbed. 



Ci Color bright green; no dorsal markings. 



di No dark lateral markings H. cinerea. 



6.2 With a dark lateral band H. andersonii. 



02 Brownish, dorsal markings present. 



di Large, circular dark dots above H. gratiosa. 



do Small, irregular markings above. 



ei With a dark X on the back H. crucifer. 



Co With the spots on the back elongate and in lines, . . .H. squirella. 

 a2 Western species. 



bi With a large white spot below the eye; fingers webbed H. baudinii. 



bo No spot below the eye; fingers free; size medium to small. 



ci With dark spots above H. arenkolor. 



Co With hnear markings above H. regilla. 



H. versicolor LeConte. Common tree toad (Fig. 88 and 90). 

 Body rather stout, with a rough, warty skin and very variable in color, 

 varying from white or gray to deep brown or bright green and more or 

 less mottled, with usually an oblique dark band above and a light spot 

 beneath each eye and a large dark irregularly star-shaped patch on 

 the back between the fore legs; length 50 mm.; hind leg 80 mm.: North 

 America, west to Minnesota, Kansas and Texas; northward to southern 

 Canada; southward into the Gulf States. 



H. crucifer Wied {H. pickeringii Storer). Spring peeper (Fig. 91). 

 Body small and delicate and varying in color from deep brown to yellow, 

 reddish, green or gray, with an oblique cross-shaped mark on the back 

 and usually a V-shaped mark between the eyes; length 28 mm.; hind 

 leg 45 mm. : eastern and central America; northward to New Brunswick; 

 westward to Manitoba; southward to Georgia, Louisiana and Kansas; 



