Snout (muzzle), 22 

 Solitary spadefoot, 1, 9, 16 

 Solitary toad, 42, 43 

 Sonora, 1, 68 

 Sonora toad, 62, 63 

 Sonora hyla, 1, 118, 119 

 Sonoran spadefoot, 38, 39 

 Sonora tree frog, 26, 118, 119 

 Sonoran toad, 60, 61, 62, 63 

 Southern bull frog, 5, 7, 30, 168, 169, 



185, 192, 193 

 South Carolina, 86, 90, 101, 104, 148, 



165, 170, 188, 215 

 Southern California toad, 18, 54, 55 

 South Dakota, 134, 180, 215 

 Southern gopher frog, 148, 149 

 Southern leopard frog, 186, 187 

 Southern meadow frog, 7, 34, 177, 



178, 186, 187 

 Southern spadefoot, 38, 39 

 Southern toad, 7, 19, 74, 75, 129 

 Southern tree frog-, 128, 129 

 Southern tree toad, 128, 129 

 Spadefoots, 2, 4, 6, 8, 10, 14, 15, 16, 



38-45,59 

 Spadefoot, 42, 43 

 Spadefoot toad, 14, 18, 42, 43, 60, 61, 



125, 173 

 Spade-footed toad, 60, 61 

 Speck, F. G., 212 

 Sphagnum frog, 192, 193 

 Spiracle, 9, 10, 11 

 Spotted frog, 186, 187 

 Spotted green frog, 176, 177 

 Spotted toad, 70, 71 

 Spotted tree frog, 92, 93 

 Spring frog, 166, 167, 174, 175, 186, 



187 

 Spring peeper, 2, 7, 8, 25, 94, 95, 



116, 117 

 Squirrel frog, 128, 129 

 Squirrel hyla, 128, 129 

 Squirrel tree frog, 7, 23, 121, 128, 129 

 Squirrel tree toad, 128, 129 

 State and province lists, 204-217 

 Stejneger, L., 3, 3 6, 49, 142, 143, 144, 



168, 188, 204, 206, 208 

 Stink frog, 160, 161 

 Stone, W., 206, 207, 212, 214, 215 

 Storer, D. H., 210 

 Storer, T. I., 53, 57, 107, 155, 157, 



161, 207 

 Storm frogs, 42, 43 

 Storm toads, 42, 43 

 Strecker, J. K., 44, 103, 133, 197, 198, 



206, 210, 215, 216 

 Strecker's ornate chorus frog, 102, 



103 

 Street, J. F., 212 

 Streets, T. H., 217 

 Striped bush frog, 94, 95 

 Striped chorus frog, 88, 89 

 Striped tree frogs, 2, 86, 87, 88, 89, 



90, 91, 94, 95 

 Structure, 1, 4. See each species ac- 

 count 

 Subarticular tubercles, 28 

 Surface, H. A., 214 

 Swamp bullfrog, 168, 169 

 Swamp chorus frog, 3, 86, 87 

 Swamp cricket frogs, 3, 9, 12, 22, 25, 



26, 84-103 

 Swamp frog, 174, 175 

 Swamp tree toad, 86, 87, 90, 91 

 Swamp tree frog, 86, 87, 90, 91, 94, 



95, 98, 99 

 Swamp whistler, 92, 93 

 Swanton, J. H., 200 

 Syrrhophus, 28, 29, 147 

 Syrrhophus eampi, 4, 29, 144, 145 

 Syrrhophus marnockii, 29, 140, 144, 



146, 147 



Tadpoles, 9, 10. See each species 

 account 



Tail crests, 9, 10, 11, 12 



Tail musculature. See muscle seg- 

 ments 



Tanner, V. M., 216 



Tarsus, 22, 28 



Taylor, E. H., 68, 142, 143, 216 



Taylor, W. P., 212 



Taylor's toad, 1, 4, 200, 201 



229 



