504 INDEX. 



Page. 



Araeosciurus , 268 



Arbutus arizonica 66 



Arctic-Alpine Zone : 71 



Zone i., 71 



Arctostaphylos pungens 67 



Arivaca Creek, Arizona 18, 112 



Arizona chipmunk 284 



cotton-rat -' 450 



cypress 41 



elk 215 



grasshopper mouse 374 



gray squirrel ■. -■ - 273 



madrona 66 



meadow-mouse 500 



pine , 38 



prairie-dog 340 



sycamore 56 



vole 500 



wood-mouse - - 391, 410 



Armadillo, Texas , 157 



Armadillos. 156 



Artiodactyla 158 



Arvicola oryzivora 455 



texiana 449 



Ash, fringe = 67 



leatherleaf 68 



' Aspen 47 



Austral Life Zone 32 



Region 70,71,72 



Zone, Lower 71 



Zone, Upper 71 



Babacomari Creek 17 



Baiomys -367, 381, 395, 403 



musculus -. 381 



taylori • 381 



Barlow, Col. J. W. , International Boundary Commissioner 1 



Bavispe Eiver 29 



Bearberry , 64 



Bear Creek - 29 



Valley 18 



Bears, grizzly 12 



Beaver, broad-tailed 350 



Sonoran .■ 350 



Beavers 349 



Belen, Texas, specimens collected at 79 



vegetation at : . . 79 



Big Hatchet Mountains, New Mexico 11, 85 



collections from 85 



flora of 85 



Bighorn, Gaillard 240 



. Mexican 233 



Nelson 245 



Rocky Mountain 235 



