298 



INDEX. 



Sense organs, 19. 



Sessile abdomen, 17, 184, 251. [See 



Abdomen.] 

 Setae, 66, 70, 108. 

 Setting-boards, 186. 

 Seventeen-year cicada, 133. 

 Sheep bot-fly, 267. 

 Sheep-tick, 272. 

 Shellac, 141-. 



Shoulder lappets, 187, 188, 242. 

 Shuckard, 230. 

 Sialidae, 170. 

 Silphidae, 166. 

 Silver solution, 39. 

 Siphonaptera, 268. 

 Sitaris, 159, 167, 168, 280. 

 Skeleton, colors of, 11. 

 Skippers, 212. 



clouded, 214. 



sooty, 214. 



Smeathman, 96, 97. 



Snellen Van Vollenhoven, 237. 



Snow-insect, 177. 



Soldier ant, 238. 



Solitary ants, 241. 



bees, 244. 



wasps, 240. 



Songs of the grasshoppers, 33. 

 South America, 151, 161. 

 Spatangoids, 280. 



Specialization, 50, 62, 245, 248, 274, 

 . 288. 



by addition, 51, 226, 246. 



by reduction, 51-53, 71, 72, 99, 



129, 138, 157, 161, 251, 281, 288. 



meaning of, 50. 



Specializations, acquired, 53. 

 Specialized orders, X.-XVI,, 53. 

 Sphegidse, 240. 

 Sphex, 241, 243. 



ichnenmonea, 240. 



Sphingidse, 208, 211. 



Spiders, 12, 26, 47, 240, 271. 



Spinnerets, 193, 259. 



Spiracles, 18, 38, 66, 107, 117, 147, 



172, 249, 255, 267. 

 Spiraeas, 154. 

 Spores, 29. 

 Spring canker-worm moth, 204, 205. 



gall-flies, 234. 



Spring-tails, 66. 

 Stainton, 183, 202. 

 Standard of reference, 50. 

 Staphylinidae, 166. 

 Staphylinus, 25, 26. 

 Sterna, 40. 

 Stick-lac, 141. 



Sting, 224, 227, 231, 240, 242, 258. 

 [See also p. 274.] 



of beak, 121, 122, 125. 



of proboscis, 262. 



Stipes, 24. 



Stone-flies, 58, 90, 166. 



Straight-winged insects, 29, 102. 



Strigillations, 33. 



Structure, effects of domestication on, 

 208. 



effects of habit on, 40, 108, 168, 



202, 280. 



effects of temperature on, 216. 



[See Correlative structures and 

 Habits.] 



Stylopidae, 159, 161, 168, 274. 



Stylops, 19, 161-163, 283. 



Subgenital plate, 34. 



Subimago, 70. 



Submentum, 25. 



Succincti, 220. 



Sucking-tube, 122, 124, 126, 133, 135, 

 142, 208, 210, 284. [See Descrip- 

 tions of types and Mouth parts.] 



Supra-cesophageal ganglion, 35, 261. 



Suspensi, 220. 



Sympathetic nerve, 37. 



Syrphidae, 264. 



Syrphus, 264. 



politus, 265. 



T. 



Tabanidae, 263-265. 

 Tabanus, 254. 



lineola, 248, 251, 263. 



Taenia, 280. 

 Tarantula-hawk, 241. 



killer, 241. 



Tarsus, 27, 78, 103. 

 Telamonides, 216-218. 

 Telea Polyphemus, 196, 198. 

 Temperature, 207, 216. 

 Tenthredinidae, 231, 246, 247. 

 Terga, 40. 

 Tergum, 18, 30. 

 Termes, 57. 



bellicosus, 95, 97. 



dirus, 95. 



flavipes, 92, 94, 96. 



Termites, 51, 94, 166. 



castes of, 94. 



Termitidae, 92. 



Terrestrial Heteroptera, 124. 



Tettix, no. 



