INDEX. 



359 



Snow-bunting 136 



Snowflake 301 



McKay's 302 



Socialistic colors, definition of 209 



Solitaire 335 



Townsend's 204, 217 



Somatoplasm, explanation of 11, 12, 13 



Sparrow, Bell's 307 



black-throated 307 



chipping 217. 305 



dusky seaside 151 



fox 308 



Gambel's 184 



golden-crowned 176, 209 



grasshopper 184 



Harris's 183 



house 209 



lark 304 



rufous-crowned 307 



sage .*. 307 



savanna 233, 304 



seaside 304 



song 248,249, 250, 308 



Texas 308 



tree 305 



vesper 303 



white-crowned 209, 305 



white-throated 183 



western savanna 184 



Specialized colors, classification of, 

 143-145 ; with or without loss of pro- 

 tection, 145. 

 Species, nature of, 103-106; Romanes 



on, 106-107. 

 Spencer, theory of physiological units, 

 6; on simplicity of reproductive 

 cells, 17; three forms of evidence 

 in proof of inheritance of acquired 

 characters, 42; first and third form 

 in proof of inheritance of acquired 

 characters criticised by Ball and 

 Romanes, 43-44; discussion of use 

 and disuse, 44-45. 

 Speotyto cunicularia hypogaea.197, 210, 274 



Sphyrapicus 236, 244, 248, 280 



ruber 243, 244 



thyroideus 146, 150, 165, 223, 281 



varius 164, 192,222, 244, 252 



uuchalis 244, 245 



Spinus 157, 218, 300 



lawrencei 177, 222 



pinus 145, 180, 216, 299 



psaltria 150, 177, 195, 241, 246 



arizoaffi 150, 151, 242 



mexicana 146, 242 



tristis, specialization of without 

 loss of protection 145 



Spiza 321 



americana 222 



Spizella 180, 196,216,217, 236, 305 



artigularis 306 



breweri . > 254, 306 



pallida 254, 306 



Sporophila 312 



morelletti 146 



Squirrel, black headed ground 68 



Stejneger on mimicry, 198; on albinism 

 and melanism, 226. 



Stelgidopteryx 315 



serripennis 215 



Stolzmann, views on sexual selection.. 91 

 Stone on plumage changes without 



moult 134 



Stonechats 335 



Strigidae 273 



Strix 273 



Structure, law of, 64; definition of, 77; 

 by Cope, 77 ; segregate, definition 

 of, 130. 



Sturnella 293 



defilippii 156, 240 



magna. 156, 157, 175, 178, 182, 203, 211, 239 

 Successional relation, definition of by 



Cope 77 



Surniculus dicruroides 198 



Swallow 314 



bank 315 



barn 218, 314 



cliff 218, 314 



rough-winged 315 



violet-green 210,215, 216, 218 



white-bellied 315 



white-breasted 210, 218 



Swifts 283 



Sylvania 329 



canadensis 221 



mitrata 222 



pusilla 157, 221 



pileolata 243 



Sylviidie 334 



Tachycineta 216, 315 



bicolor 210, 218 



tha lassina 210, 216. 218, 315 



Tanager 150, 313 



Louisiana 159, 180 



scarlet 143, 155, 180 



summer 152, 222 



western 155, 222 



Tanagridffi 313 



Taxology , successional 164 



Teleology, explanation of by Cope 78 



Terpsiphone cristata, as instance of 

 plumage change from dark to light 

 without moult 134 



