504 INDEX. 



Page. 



Araeosciurus 268 



Arbutus arizonica 66 



Arctic-Alpine Zone 71 



Zone 71 



Arctostaphylos pungena 67 



Arivaca < 'reek. Arizona Js. 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 L57 



Armadillos 156 



Artiodactyla 158 



A rvicola oryzivora 455 



texiana 44!) 



Ash, fringe 67 



leatherleaf 68 



Aspen 47 



Austral Life Zone 32 



Region 70, 71, 72 



Zone, Lower 71 



Zone, Upper 71 



Babacomari (reek 17 



Baiomys 367, 381, 395. 403 



musculus 381 



taylori 381 



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



Bavispe River 20 



Bearberry l>4 



Bear ( reek 29 



Valley 18 



Bears, grizzly 12 



I'm aver, broad-tailed 350 



Sonoran 350 



Beavers % 349 



Helen. Texas, specimens collected at 79 



vegetation al 79 



Big Hatcliei Mountains, New Mexico 11. 85 



collections from. 85 



fl( ira of 85 



Bighorn. Gaillard 240 



Mexican 233 



Nelson 215 



Rocky Mountain 235 



