309 
Sialia sialis, 18, 21, 26, 27, 28, 29, 30, 31, 33, 34, 292-294, 
295. 
Sickle-billed curlew, 97. 
Sitta canadensis, 36, 276. 
carolinensis, 48, 276. 
carolinensis aculeata, 276. 
pusilla, 276. 
pygmea, 276. 
Siskin, Pine, 183-184. 
Skimmer, Black, 58, 
Slate-colored Snowbird or Junco, 32, 34, 35, 198, 203- 
206, 
Slate-colored Sparrow, 212. 
Slender- billed Nuthatch, 276. 
Small-billed Water-Thrush, 35, 36, 37, 256. 
Smith’s Longspur, 185-186. 
Snake Bird, 59. 
* Snipe, Jack, 30, 34. 92-93. 
Red-breasted, 92. 
Robin, 92. 
Wilson’s, 11, 29, 30, 34, 35, 80-92. 
Snowbird, Slate-colored (=Junco). 
Snow Bunting, 33, 184-185. 
Snowflake, 33, 184-185. 
Snow Goose, Greater, 75. 
Lesser, 27, 29, 33, 35, 74-75. 
Snowy Heron, 83. 
Snowy Owl, 123. 
Snow Plover, 101. 
Solitaire, Townsend’s 206, 282. 
Solitary Sandpiper, 36, 37, 95-96. 
Solitary Tattler, 36, 37, 95-96. 
Solitary Vireo, 235-236. 
Somateria dresseri, 73. 
spectabilis, 73. 
Song Sparrow, 27, 28, 30, 33, 34, 35, 207-209. 
Mountain, 209. 
Sooty Tern, 58. 
Sora, 87. 
Southern Hairy Woodpecker, 128. 
Sparrow, Bachman's, 207. 
Baird’s, 189-190. 
* Black-chinned, 203. 
Black-throated, 206. 
Boucard’s, 207. 
Brewer's, 201-202. 
Cassin’s, 207. 
Chadbourne’s, 202-208. 
Chipping, 30, 34, 35, 200, 233. 
Clay-colored, 201. 
English, 34, 184. a 
European House, 34, 184. 
European Tree, 184. 
Field, 28, 30, 33, 34, 202. 
Fox, 27, 28, 33, 34, 35, 211-212, 
Golden-crowned, 196. 
Grasshopper, 36, 190. 
Harris’s, 27, 32, 193-195. 
Henslow’s, 191. 
Intermediate, 196. 
Ipswich, 188. 
Lark, 35, 192-193. 
Le Conte’s, 191-192. 
Lincoln's, 26, 37, 110, 209-210. 
Mexican, 207. 
Sparrow, Mountain Song, 209. 
Nelson's Sharp-tailed, 192. 
Rock, 207. 
Sage, 206. 
Savanna, 31, 32, 34, 35, 36, 188-189. 
Seaside, 192. 
Sharp-tailed, 192. 
Slate-colored, 212. 
Song, 27, 28, 30, 33, 34, 35, 207-29, 
Swamp, 28, 30,,33, 34, 35, 36, 37, 206, 208, 210-211. 
Texas, 212. 
Tree, 28, 30, 32, 38, 34, 182, 198-199. 
Vesper, 30, 31, 34, 187-188. 
Western Chipping, 200-201, 233. 
Western Grasshopper, 191. 
Western Lark, 193. 
Western Savanna, 188, 189. 
Western Tree, 199-200. 
Western Vesper, 187, 188. 
White-crowned, 23, 28, 30, 32, 33, 34, 35, 36, 37, 
195-196. 
White-throated, 28, 30, 32, 33, 34, 35, 36, 37, 
196-198. 
Yellow-winged, 36, 190. 
Sparrow Hawk, 29, 33, 34, 111, 119-120, 
Spatula clypeata, 31, 36, 68. 
Speotyto cunicularia hypogea, 123. 
Sphyrapicus thyroideus, 130. 
varius, 34, 35, 37, 129-130. 
varius nuchalis, 130, 206. 
Spinus pinus, 183-184. 
psaltria, 183. 
psaltria arizone, 183. 
psaltria mexicanus, 183. 
tristis, 28, 33, 35, 36, 182-183, 245. 
Spiza americana, 35, 36, 37, 220-221. 
Spizella arenacea, 202-203. 
atrigularis, 203. 
breweri, 201-202. 
monticola, 28, 30, 32, 33, 34, 182, 198-199. 
monticola ochracea, 199-200. 
pallida, 201. 
Pasilla, 28, 30, 33, 34, 202. 
socialis, 30, 34, 35, 200, 233. 
socialis arizone, 200-201, 233. 
Spoon-bill, Roseate, 80. 
Spoon-billed Duck, 31, 36, 68. 
Sporophila morelleti, 220, 
Spotted Sandpiper, 97. 
Sprague’s Lark or Pipit, 264. 
Sprague’s Titlark, 264, 
Sprig-tail, 27, 28, 31, 33, 34, 68-69. 
Spruce Partridge or Grouse, 103. 
Stelgidopteryx serripennis, 35, 230-231. 
Stephens's Vireo, 206, 237, 
Stercorarius longicaudns, 55. 
parasiticus, 55. 
pomarinus, 55. 
Sterna antillarum, 58. 
forsteri, 57. 
fuliginosa, 58. 
hirundo, 58. 
maxima, 57. 
sandvicensis acuflavida, 57. 
tschegrava, 57. 
