INDEX 



wings, 57; structural colors, 194; 



423, 449, 463 

 Toyama, 438 

 Tracheae, development of, 153, *i55 ; 



distribution, *i32, *i33; structure, 



*I37 



Tracheal gills, *i34, *i35, 190 

 Tracheation, types of, 134 

 Trelease, 454 

 Tremex, *2i 

 Triassic insects, 388 

 Trichius, 268 

 Trichodeum, 94, *95 

 Tricho gramma, 313 

 Trichoptera, 17, *i8 ; origin of, 24, 



*25 ; silk glands, 85 

 Trichopterygidae, size of, 27, 311 

 Trimen, on dispersal, 367 ; on P. 



merope, 226, 228; 450, 45 1 

 T rimer otropis, protective resemblance 



of, 219 



Trimorphism, 202 

 Triphleps, egg of, *i59 

 Tritocerebrum, 91, 152 

 Triungulin, 174, *i75 

 Trochanter, *49, *5i, *52, *53 

 Trochantine, 51 

 Trop&a luna, cocoon of, 170 

 Tropical region, 377 

 Tropisms, 345 

 Trouessart, 462 

 Trouvelot, on cocoon-spinning, 170; 



eclosion, 172; larval growth, 164; 



442 



Tryphana, 197 

 Tsetse fly, 276 

 Tutt, 463 

 Typhoid fever, 305 



Uhler, on distribution, 380 



Urech, 447, 448, 449 



Uric acid, 124; as a pigment, 196 



Utricularia, 257 



Uzel, 442 



Vagina, 140, *i4i, *i42 



Valette St. George, la, 437 



Vanessa, development of scales of, 

 *79 ; head of butterfly, *42 ; antiopa, 

 298 ; phototropism, 353 ; atalanta, 

 color change, 214 ; cardui, disper- 

 sion, 366, 371 ; geographical varia- 

 tion, 373 ; polychloros, coloration, 

 200; melanism, 201 ; urtica;, colora- 

 tion, 196, 200 ; melanism, 201 ; tem- 

 perature experiments^ 205 



Variation in coloration, 211, *2i2, 



*2I3 



Variations, blastogenic, 243 ; classes 

 of, 214, 241 ; congenital, 243 ; en- 

 vironmental, 242 ; functional, 242 



Vas deferens, *i4o, 141 



Vayssiere, 432, 435, 445 



Vedalia (see Novius) 



Veins, 58 



Velum, *27o 



Venation, 58, *S9, *6o, *6i 



Ventral sinus, 126, *i39 



Ventral tube, *68 



Ventriculus, *n8 



Verhoeff, 418, 420, 458 



Verloren, 431 



Vernon, 450, 453 



Verson, 438 



Vertex, 30 



Verworn, on phototropism, 351 ; 460 



Vespa, nests of, 328, *329 ; olfactory 

 organ, *ioo ; sensillum, *95 ; taste 

 cups, *98 ; tongue, *97 



Vespidse, 328 



Viallanes, 414, 425, 432, 435, 443 



Vision, 1 08 



Vitelline membrane, *i46 



Vitreous body, *io9 



Voeltzkow, 441 



Vogler, 435 



Volucella, mimicry by, ^235 ; preda- 

 ceous, 309 



Voss, 418 



Vries, de, mutation theory of, 247, 453 



Wagner, J., 412 



Wagner, N., 437 



Wahl, 444 



Walker, 445 



Walking, 56 



Wallace, on mimicry, 226 ; natural se- 

 lection, 238; 450, 452, 461, 462 



Walsh, on losses through insects, 

 394; 403 



Walter, on mouth parts, 42, 415 



Walton, on meron, 51, 417 



Warning coloration, 221 



Wasmann, on myrmecophilisni, 340 ; 

 458, 460, 461 



Wasps, 328 



Watase, 428 



Wax, glands, 83 ; pincers, *27o, 271 



Webster, on dispersal, 368, 378, 381, 

 382 ; losses through insects, 394 ; 

 405; 451, 454, 457, 462, 463 



Wedde, 415 



Weed, on birds in relation to insects, 

 286. 287, 289, 291, 456 



Weinland, 428 



Weismann, . on acquired characters, 



