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 Otospermuphihis. ) 

 buckleyi. {See Otospemiophihis.) 



canescens 333 



chrysodeirus brevicaudus 313 



grammurus. {See Otospermophilus.) 

 harrisii. (See Ammospermophihis.) 



saxicolus. (See Ammospermophilus.) 

 leucurus. {See Ammospermophilus.) 

 mexicanus parvidens. {See Citellus.) 



sonoriensis 337 



spilosoma annectens. {See Citellus.) 

 arens. {See Citellus.) 



marginatus 331 



tereticaudus. {See Citellus.) 

 tridecemlineatus texensis. {See Citellus.) 



(xerospermophilus) microspilotus 333 



Spruce, douglass 39 



Squirrel, Abert 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 



