504 INDEX. 



Page. 



Arteosciiirus 268 



Arbutus arizonica fiG 



Arctic-Alpine Zone 71 



Zone 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 J58 



Arvicola cry zi vora 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 River 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 



