List of Half-Tones 

 Plate Facing Page 



LI 1 1 Figs. 165-169. Hyla regilla Baird and Girard: 

 the skin; eggs laid in clusters; vocal pouch and 

 other structural characteristics . . .138 



LI V " Most of the Spring Peepers live on the ground 

 in the woods throughout the year except for 

 a few weeks in early spring, when they are 

 to be found in the ponds and the marshes 



adjacent." 139 



LV Figs. 170-172. \\2ih\ts oi Hyiapicheringii Stoxtr, 148 



LVI Figs. 173-177. Studies of The Southern Tree 

 Frog {Hyla squirella Bosc) : a delicate, smooth- 

 skinned little tree frog, one of the most active 



in North America 149 



LVI I Figs, 178-183. Smilisca haudinii: changes from 

 nearly black to delicate light green or fawn 

 colour; fingers with slight webs; structure study 



of under parts 152 



LVI 1 1 Fig. 184. Studies of the Cricket Frog {Acris 

 gryllus Le Conte). Fig. 185. Studies of the 

 Swamp Tree Frog (Chorophilus n. feriarum 

 Baird) 153 



LIX Figs. 186-187. Lithodytes lair ans Cope. Fig. 188. 

 Liihodytes latrans: characteristics of under 

 surface 164 



LX Figs. 189-192. Engy stoma carolinense \\o\hrodk. 



Fig. 193. Engystoma texense Girard . .165 



LXI Figs. 194-196. Hypopachus cuneus Cope: fat 

 squat body; fold of skin on the top of head 

 back of eyes; structure of hand and foot; ver- 

 tebral streak; arrangement of spots and bands 

 of black on upper surface . . . .170 

 LXI I "The Leopard Frog lives in meadows and fields 



adjacent to brooks and marshes" . . -171 

 LXI 1 1 Figs. 197-199. Leopard Frogs (Rana pipiens 

 Shreber): structure study of hand and foot; 

 typical young Leopard Frogs . . . .176 

 LXIV Figs. 200-201. Characteristics of the Common 



Leopard Frog (/?^W(3 ^t;/)z>w5 Shreber) . .177 

 LXV Development of the Leopard F'rog's Egg . .178 



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