White-lipped frog. Leptodactylus albilabris . . . . 142 



Camp's frog. Syrrhophus campi 144 



Marnock's frog. Syrrhophus marnockii 146 



True frogs 148 



Gopher frog. Rana aesopus 148 



Northern gopher frog. Rana areolata 150 



Oregon red-legged frog. Rana aurora aurora . . 152 



California red-legged frog. Rana aurora draytonii . . 154 



California yellow-legged frog. Rana boylii boy lit . . . 156 



Sierra Madre yellow-legged frog. Rana boy Hi muscosa . 158 



Sierra Nevada yellow-legged frog. Rana boylii sierrae . 160 



Northern wood frog. Rana cantabrigensis 162 



Bull frog. Rana catesbeiana 164 



Green frog. Rana clamitans 166 



Southern bull frog. Rana grylio 168 



River-swamp frog. Rana hecks cheri 170 



Nevada frog. Rana onca 172 



Pickerel frog. Rana palustris 174 



Meadow frog. Rana pipiens pipiens . . ... 176 



Unspotted meadow frog. Rana pipiens burns i . . 178 



Mottled meadow frog. Rana pipiens kandiyohi . . 180 



Western spotted frog. Rana pretiosa pretiosa . . . 182 



Nevada spotted frog. Rana pretiosa luteiventris (no plate) 183 



Mink frog. Rana septentrionalis 184 



Southern meadow frog. Rana sphenocephala . . . . 186 



Wood frog. Rana sylvatica 188 



Mexican frog. Rana tarahumarae 190 



Carpenter frog. Rana virgatipes 192 



Narrow-mouthed toads 194 



Carolina narrow-mouthed toad. Gastrophryne carolinensis 1 94 



Texas narrow-mouthed toad. Gastrophryne t ex en sis . . 196 

 Mitchell's narrow-mouthed toad. Gastrophryne areolata 



(no plate) 198 



Taylor's toad. Hypopachus cuneus 200 



Bibliography 203 



Index ^ 219 



XI 



