INDEX, 
in different classes of animals, 
111; diverse habits of, 156. 
SexuaL setzction, 156; its nor- 
mal action to develop colour in 
both sexes, 247; among birds, 
283. 
Sivewicx, Mr. A., on protective 
colouring of moths, 62. 
Stuocyonrp#, 300. 
Sirta, sexual colouring and nidi- 
fication of, 243. 
Sirrznia, sexual colouring and 
nidification of, 243. 
Snanzs, mimicry among, 101. 
Sone of birds, instinctive or imita- 
tive, 220. 
Spzcrzs, law of population of, 28; 
abundance or rarity of, depend- 
ent on the adaptation to condi- 
tions, 33; definition of, 141, 
161; the range and constancy 
of, 143; extreme variation in, 
163, 164. 
Srzep of animals, limits of, 292. 
Sphecia craboniforme, 90, 
Sphecomorpha chalybea, 96. 
Spuecip#, mimicked by flies, 97. 
Sripers, which mimic ants, 98; 
and flower buds, 99. 
Spilosoma menthastri, 88. 
Srarnton, Mr., on moths rejected 
by turkeys, 78, 88. 
Sravacuris, a genus of Erycinide, 
the object of mimicry, 84. 
Srincixe insects generally conspi- 
cuously coloured, 72. 
Srreprocitta, 196. 
Sruryips, sexual colouring and 
nidification of, 244, 
Srurnopastor, 239. 
Sr. Hexena, 10. 
383 
Streptolabis hispoides, 93. : 
Srrucete for existence, 28, 33. 
Survivat of the fittest, law of, 
stated, 35 ; its action in deter- 
mining colour, 67. 
Swatrnson’s circular and quinarian 
theory, 45. 
Syniviap#, sexual colouring and 
nidification of, 245 
Sywapra, 258, 
TACHORNIS phenicobea, 228. 
Tachyris hombronii, 172; ithome, 
172; lycaste, 172 ; lyncida, 172; 
nephele, 172; nero, 172; zarinda, 
172. 
Tanacrips, sexual colouring and 
nidification of, 245. 
Tarrr, 299. 
Trtrruort, similar colouring of 
two sexes, 114. 
Truprrate and cold climates fa- 
vourable to civilization, 318. 
Turcopontta, 299. 
Tuurates, mimicked by Hetero- 
mera, 95. 
Thyca descombesi, 172; hyparcte, 
172; rosenbergii, 172; zebuda, 
172. 
Ticrr, adaptive colouring of, 52. 
Times newspaper on Natural Selec- 
tion, 296. 
Toous, importance of, to man, 
314. 
Tree Frogs, probable mimicry by, 
103. 
TriconDyLA, 97. 
Trimen, Mr., on rank of the Papi- 
lionide, 136. 
Tristram, Rev. H., on colours of 
desert animals, 50. 
