Redstart, 184. Rexford, Eben E., 192. Ridgway, Robert, 24, 94, 136, 285, 303. Roberts, Charles G. D., 69. Robin, eastern, 32, 73, 95, 127, 205, 206. western, 22, 24, 31, 32, 55, 68, 70, 72, 73, 106, 121, 127, 129, 151, 192, 199, 200, 205-207, 210, 216, 231, 253, 270, 290. Royal Gorge, 43, 117, 122. Sandpiper, spotted, 51, 73, 163, 204, 271. Sapsucker, red-naped, 211, 212. Williamson's, 75-79, 160, 161. Seton, Ernest Thompson, 194, 229, 272. Seven Lakes, 55, 61, 70, 71, 72, 104, 146. Shrike, white-rumped, 98. Silver Plume, 183, 207, 216, 224, 226. Siskin, pine, 128, 200, 202, 203, 210, 216, 231, 261. Skylark, European, 87. Solitaire, Townsend's, 261, 270, 290, 298-303. South Park, 131, 206, 250, 259, 263-278. Sparrow, 25. Brewer's, 186. chipping, western, 24, 130, 215, 216, 259. clay-colored, 128, 203. English, 127, 181-183. lark, western, 24, 192. Lincoln's, 70, 71, 73, 99, 106, 134, 187, 200, 278. mountain song, 126, 133-135, 193, 278, 290. savanna, western, 264, 266, 267, 274-276. song, 92, 126, 133-135, 193, 288. white-crowned, 21, 22, 52-55, 60, 61, 68, 72-74, 103, 126, 129, 200, 204, 213, 214, 231, 238, 239, 244, 253, 255, 256, 259, 261, 281, 282. Swallows, 131. barn, 279. cliff, 99, 118, 213, 263, 266. violet-green, 207, 208, 259, 279. Tabb, John B., 192. Tanager, 25, 151. Louisiana, 39, 40, 119, 279. scarlet, 39, 40. summer, 39. Thompson, Maurice, 35. Thrasher, brown, 37, 302. Thrush, 37, 302. hermit, 69. mountain hermit, 38, 68-70, 72, 73, 204, 210, 212, 215, 218, 219, 231, 235, 236, 262. veery, 135, 136. willow, 135, 136, 200, 230. wood, 69. Tillie Ann, Mount, 260-262. Torrey's Peak, 232, 237, 239, 241, 244, 245, 250, 256. Towhee, 36, 37. green-tailed, 37-39, 62, 72, 98, 126, 130, 133, 185, 191, 200, 203, 204, 210, 218, 259, 278, 292-295. spurred, 36, 37, 185, 189, 191, 200, 204, 290. Vireo, 151. warbling, 31, 73, 118, 198, 199, 209, 215, 218, 230, 262. Warbler, Audubon's, 62-64, 68, 70, 126, 159, 200, 204, 208, 215, 216, 231, 235, 237, 238, 259. Macgillivray's, 200, 205, 209. mountain, 157. myrtle, 62, 159. pileolated, 63. summer, 31, 119, 133, 157, 158, 192, 290. Wilson's, 63, 64, 70, 72, 126, 200, 204, 213, 214, 231, 238, 244. Water-ousel (_see_ dipper), 163-174, 185, 209, 210. Woodpeckers, 24, 75, 160, 211, 262. Batchelder's, 67, 72. downy, 67. Lewis's, 160-162, 190. red-headed, 162. Wood-pewee, eastern, 32. western, 32, 119, 121, 132, 192, 261. Wren, Bewick's, 297. Carolina, 64, 297. rock, 185, 186, 189, 191, 296-298. western house, 73, 106, 117, 118, 217, 230, 278, 279. Yellow-throat, western, 193, 290. PRINTED FOR A. C. McCLURG & CO. BY THE UNIVERSITY PRESS, JOHN WILSON & SON (INC.) CAMBRIDGE, U. S. A. * * * * * Transcriber's note: