574 
Shufeldt’s Junco, 376 
Sialia, 526 
sialis, Sialia, 527 
Sinuatus, Corvus corax, 291 
Siskin, Pine, 346 
Sitta, 498 
Sittide, 498 
Skua, Richardson’s, 14 
Slate-coloured Fox-Sparrow, 390 
Slate-coloured Junco, 375 
‘Snipe, Wilson’s, 109 
Snow-Bunting, 349 
-Snow-Goose, 66 
Snow-Goose, Greater 67 
Snowy Egret, 85 
Snowy Owl, 210 
‘Solitaire, Townsend’s, 515 
Somateria, 61 
Song-Sparrow, Eastern, 388 
Song-Sparrow, Mountain, 386 
Sora, 95 
Sparrow, Baird’s, 358 
“Sparrow, Brewer’s, 372 
Sparrow, Cassin’s, 384 
Sparrow, Clay-coloured, 371 
Sparrow, Desert, 382 
Sparrow, English, 348 
Sparrow, Golden-crowned, 367 
Sparrow, Harris’s, 363 
Sparrow, Intermediate or Gambel’s, 
366 
Sparrow, Leconte’s, 361 
Sparrow, Lincoln’s, 388 
Sparrow, Sage-, 383 
Sparrow, Scott’s, 385 
Sparrow, Swamp, 390 
‘Sparrow, Western Chipping, 369 
Sparrow, Western Savannah, 357 
Sparrow, White-crowned, 364 
Sparrow, White-throated, 367 
Sparrow-Hawk, American, 190 
‘Sparrow-Hawk, Desert, 192 
sparverius, Faléo, 190 
Spatula, 45 
Speotyto, 211 
Sphyrapicus, 228 
Spinus, 346 
Spiza, 405 
Spizella, 368 
sponsa, Aix, 48 
Spoonbill, Roseate, 74 
Spotted Owl, 201 
Spotted Sandpiper, 126 
-spurius, Icterus, 312 
Spurred Towhee, 392 
‘squamata, Callipepla, 141 
_Squatarola, 130 
Birds of Colorado 
squatarola, Squatarola, 130 
Steganopodes, 26 
Steganopus, 102 
Stelgidopteryx, 422 
stellaris, Cistothorus, 494 
Stellula, 256 
Stercorariidz, 13 
Stercorarius, 13 
Sterna, 22 
Stilt, Black-necked, 106 
Stilt Sandpiper, 112 
streperus, Chaulelasmus, 38 
striata, Dendroica, 455 
striatulus, Astur atricapillus, 173 
stricklandi, Loxia curvirostra, 334 
ge ie Chondestes grammicus, 
I 
Striges, 194 
Strigide, 197 
Strix, 200 
Sturnella, 309 
subis, Progne, 413 
Surf Scoter, 63 
surinamensis, Hydrochelidon nigra, 
5 
swainsoni, Buteo, 176 
swainsoni, Hylocichla ustulata, 519 
swainsoni, Vireosylva gilva, 433 
Swainson’s Hawk, 176 
Swallow, Bank-, 422 
Swallow, Barn-, 417 
Swallow, Cliff-, 415 
Swallow, Rough-winged, 423 
Swallow, Tree-, 418 
Swallow, Violet-green, 420 
Swallow-tailed Kite, 165 
Swamp-Sparrow, 390 
Swan, Trumpeter, 72 
Swan, Whistling, 72 
Swift, Black, 248 
Swift, White-throated, 250 
Sylviide, 509 
Tachycineta, 420 
Tanager, Louisiana, 409 
Tanager, Scarlet, 410 
Tanager, Western, 409 
Tanager, Western Summer, 411 
Tangaride, 408 
Teal, Blue-winged, 43 
Teal, Cinnamon, 44 
Teal, Green-winged, 41 
Telmatodytes, 495 
Tennessee Warbler, 446 
tephrocotis, Leucosticte, 336 
Tern, Arctic, 24 
Tern, Black, 25 
