472 



INDEX 



Saliva, 27-28 



Salivary glands, 27, 413, 432 



Saturniidae, insular races, 378 ; silk- 

 production, 443 



Sawflies, family life, 214 ; cha- 

 racters, 318-319 



Scarabaeus, 212, 447 



Scent, organs of, 73-74 ; in pairing, 

 203-206 



Schizoneura lanigera, 301, 393-394, 

 424 



Scolytidae, 219-220, 271 



Seasonal adaptations, 298-305 



forms, 361-362, 370-371 ; isola- 

 tion, 378 



Segmentation of body, 2, 13 ; of 

 egg, 152 ; of embryo, 152- 

 154 ; numerical correspon- 

 dence in classes of Arthro- 

 poda, 348 



Segregation, 377 



Selenia bilunaria, 363-364 



Sensory organs, 8, 72-93 



Sex, distinction, 10 ; inheritance of, 

 1 26-1 3 1 



Sexual characters, 147-148 



attraction and selection, 201- 

 208, 368 



Sheep-flies, 112-113, 399 



Sight, 87-93 >* i^ pairing, 201-202 



Silkworm, cocoon, 108 ; cultiva- 

 tion, 443. See also Bombyx, 

 Saturniidae. 



Slave-making ants, 245-246 



Sleeping-sickness and tsetse-flies, 



429-431 



Smell, 73-76 



Smerinthus ocellatus and populi, 370 



Social life of insects, 218-261 



Spathegaster, 387 



Species, 322-323 ; variation in, 350- 

 356 ; origin of, 365 ; pro- 

 bable antiquity of some, 407 



Specific characters of wasps, 234- 

 236, 322-323 ; utility of, 

 369-370 



Spermatheca, 116, 143 



Spermatid, 118 



Spermatocytes, 118-119 



Spermatozoa, 9-10, 116-119 



Sperm-cells, 9-10 ; nuclei, 115-116 



Sphegidae, 320 



Spiders and insects, 397 



Spiracles, 4, 42-43, 278 



Spitsbergen, life relations in, 381- 

 382 



I Sporozoan parasites, 413 



Springtails. See Collembola. 

 I Staphylinidae, in ants' nests, 250 ; 

 j in termites* nests, 2S9-«6o ; 



' of seashore, 285-286 



I Stegomyia and yellow fever, 434 

 j Stenogaster, 222-223 

 I Stick-insects, 272-273, 369 

 ! Stigmata. See Spiracles. 

 j Stimulation of nerve-endings, 7, 



70-93 

 I vStomach, 28-30 

 Stoneflies, 311. See also 



Plecoptera. 

 Strepsiptera, 317 

 Stridulation, 206-207, 213 

 Struggle for existence, 366-367 

 Sub-imago, 192 

 Superlinguae, 19, 347-348 

 Surface-film and aquatic insects, 



279-282 

 Swimming, 53, 292, 297 

 Symbiosis of Flagellata with termites, 



410 

 Symbolism from insects, 447 

 Symphyta, 318-319, 343 

 Synagris, feeding of larvae, 215 



Tabanidae, jaws, 20-21 ; feeding 

 on blood, 398 



Tactile organs, 72-73 



Tapeworm larva in Trichodectes, 

 408 



Tapinoma, 246 



Taste, 77 



Tenebrio molitor, abnormal larvae, 

 187-189 ; economic impor- 

 tance, 425 



Teras terminalis, 386-387 



Termites, 253-260 ; injury to 

 timber, 428 



Tertiary era, insects of, 341-343 



Testis, 145 



Thrips. See Thysanoptera. 



Thynnidae, 237 



Thysanoptera, 31 1-3 12 



Thysanura, 185-186 ; characters, 

 308, 309-310 ; relationships, 

 328 



Tobacco, crop damaged by spring- 

 tails, I II-H2 ; manufactured 

 eaten by beetle, 426 



Tongue. See Hypopharynx. 



Tortrix viridana, 282-283 



Touch, sense of, 72-73 



