INDEX. 529 



Page. 



Tract, Yaqui Basin Subtropical 73, 74 



Tracts, differentiation , . 73 



Transition Zone 39, 52, 56, 62, 68, 71 



Tree, Fremont 63 



Trees of the Animas Mountains 91 



chart showing distribution on west side of 92 



Fort Clark, Texas 75 



introduced species of 69 



Tres Bellotas Canyon 18 



Tres Hermanas Mountains - 30 



Trinity River 9 



Trinodontomys 384. 394, 395 



Tronadora 70 



Tropical Region ' 70, 71, 72 



Tucson, Arizona 15. 17, 18, 108 



flora of : 108 



picturesque appearance of vegetation at 108 



rept iles and batrachi^^s from 109 



Tule Desert 19 



Mountains 19, 120 



reptiles in 121 



Wells, Arizona 18, 120 



Tumacacori Mission, Arizona 17, 107 



Ulnius crassifolia 54 



Umbellularia californica ; 56 



Ungnadia speciosa 63 



Ungulata 158 



Unlucky Lake, California 21. 131 



Upper Corner Monument 84 



Upper Sonoran Life Zone 37. 41. 50, 51. 52, 59, 62. 68 



Valle, Felipe, International Boundary Commissioner 1 



Vaquelinia 57 



californica 57 



Vole, Arizona 500 



California 498 



Graham Mountain 500 



Guadalupe Mountain 501 



Mogollon Mountain 501 



San Francisco Mountain ... 500 



Voles 493 



Wagner, Frank, hospital steward 6 



Walnut, western 44 



Warsaw Mills, Arizona 18, 111 



Western Desert Tract 36, 73, 74 



White Pine, Mexican 36 



Whitewater, Chihuahua .' 11, 12, 15, 88 



vegetation of 88 



Wilcox, Major Timothy E 6, 102 



Willow, almondleaf 46 



Bigelow 47 



black 45 



canescent 46 



30639— No. 56—07 .m 34 



