524 INDEX. 



Sciurus, alleni 269 



apache 270 



arizonensis '. 273 



arizonensis 278 



huachuca 277 



carolinensis leucotis 276 



fossor anthonyi ' 250 



fremonti grahamensis. - 261 



mogoUonensis '. 256 



griseus anthonyi 264 



nigripes 267 



hudsonicus .341 



mogoUonensis 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 45I 



texianus 448 449 



minimus 446 447 



Signal Mountain 28 131 



Sigura ' gg 



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



Sinita gg 



Sitomys americanus arizonse 4II 



herronii ^gy 



nigellus 437 



insolatus 384,394 



Small-toothed ground-squirrel 32g 



Sonoma harvest-mouse ^g^ 



Sonora iron-wood 25 



white-tailed deer -lyE 



Sonoran beaver ocq 



