524 INDEX. 



Page. 



Sciurus, alleni 269 



apache 270 



arizonensis 273 



arizonensis 278 



huachuca 277 



carolinensis leucotis 276 



fossor anthonyi 250 



f remont i grahamensis 261 



mogollonensis 256 



griseus anthonyi 264 



nigripes 267 



hudsonicus 341 



mogollonensis 256 



mearnsi 262 



oculatus 268 



rufiventer 271 



texianus 271 



striatus asiaticus 283 



Screw bean ' 59 



Seca Mountains, description of 82 



Service tree, western 57 



Seven Wells, Salton River, California 21, 129 



Sheep, mountain 233 



Shittimwood 67 



Sierra de las Tinajas Altas 20 



de San Antonio Mountains 105 



de Sonoyta 116 



Espuela Mountains •. 101 



Madre Mountains 89 



Pinta Mountains 19 



Rica Mountains, Chihuahua, description of 84 



flora of 85 



Seca 10 



Sigmodon 367, 445 



hispidus 445, 446 



arizonse 448, 450 



berlandieri 449 



eremicus 451 



texianus 448, 449 



minimus 446, 447 



Signal Mountain 28, 131 



Sigura 66 



Simpson, Charles T., coauthor of report on moUusca 3 



Sinita 66 



Sitomys americanus arizonte 411 



herronii 437 



nigellus 437 



insolatus 384, 394 



Small-toothed ground-squirrel 328 



Sonoma harvest-mouse 464 



Sonora iron-wood 15 



white-tailed deer 175 



Sonoran beaver 350 



