INDEX. 525 



Page. 



Sonoran harvest-mouse 459 



Life Zone. : 67, 68 



Sonoyta, Sonora. : ; 18, 115 



desert mouse 443 



plains mouse ._, 384 



Sonoyta River .'......' 116, 117 



' lagunas of 119 



Valley , 117,118 



vegetation of 116, 118 



Sophora secundiflora 61 



Spanish Bayonet, Texas ■ : 43 



Spermophile. {See Ground-squirrel.) 



Spermophilus 297 



beecheyi. {See Otospermophilus.) 

 buckleyi. (See Otospermophilus.) 



canescens. 333 



chrysodeirus brevicaudus 313 



grammurus. {See Otospermophilus.) 

 harrisii. {See Ammospermophilus.) 



saxicolus. {See Ammospermophilus.) 

 leucurus. {See Ammospermophilus.) 

 mexicanus parvidens. {See Citellus.) 



sonoriensis 337 



spilosoma annectens. {See Citelhis.) 

 arena. {See Citellus.) 



marginatus 331 



tereticaudus. {See Citellus.) 

 tridecemlineatus texensis. {See Citellus.) 



(xerospermophilus) microspilotus 333 



Spruce, douglass 39 



Squirrel, Abort pine 250 



Allen 269 



Anthony gray 264 



Apache 270 



Arizona gray 273 



Huachuca ; 277 



Texas fox 281 



Squirrels 247 



fox :.. 281 



red , 256 



slender 268 



western gray - 264 



Station No. 1 (Fort Worth, Texas) 75 



No. 2 (Fort Clark, Texas) 75 



No. 3 (Fort Hancock, Texas) 77 



No. 4 (Belen station, Texas) 79 



No. 5 (El Paso, Texas) 79 



No. 6 (Rio Grande, Chihuahua) 81 



No. 7 (near Wragg's Ranch, Texas) ■ 81 



No. 8 (Palomas Lakes, Chihuahua) 82 



No. 9 (near Columbus, New Mexico) 83 



No. 10 (Carrizalillo Springs, New Mexico) 83 



No. 11 (Upper Corner Monument) 84 



No. 12 (Big Hatchet Mountain, New Mexico) 85 



