396 



Index 



Discontinuous variation, 137. 



Diseases caused or prevented by 

 insects, 342. 



Dorsal closure of embryo, 96-7. 



Dragonflies, 199-202; eyes, 7, 37; 

 jaws, 14; thorax, 22; wings, 

 28, 54; blood-system, 56; air- 

 tubes, 59; kidney-tubes, 71; 

 genital armature, 82 ; embryo, 

 91-2, 96; larvjE, 106, 1 13-14, 

 294; distribution, 298-9; re- 

 lationships, 350 ; fossils, 355. 



Drepanulids, 238. 



Drone-flies, 108, 263, 29a. 



Ducts of spittle-glands, 67-9 ; of 

 poison-glands, 70 ; of genital 

 glands, 73-5, 79, 81, 99-100. 



Dyticida;, 208, 290-1. 



Ears, 43-7. 



Earwigs, 170-2; wings, 29; eyes, 

 39; kidney-tubes, 71; genital 

 ducts, 82 ; hatching, loi ; varia- 

 tion of forceps, 137-38; rela- 

 tionships, 348-9. 



Ecdysis, 115. 



Ectoderm, 91 ; organs developed 

 Irom, 93-97. 



Ectotrophi, 170. 



Edibility of highly-coloured in- 

 sects, 321. 



Egg-capsule, 75. 



Eggs, 73, 84-8. 



ElateridjE, 217, 360. 



Elytra, 206. 



Embiidae, 179-80. 



Embolium, 187. 



Embryo, development of, 89-100 ; 

 reproduction by, 126. 



Embryonic membranes, 91-3. 



Empids, 261. 



Endoblast, 91, 97. 



Endoderm, 97. 



Endomychida;, 211. 



Entomobryidse, 167. 



Entotrophi, 169. 



Environment. See Surroundings. 



Ephemeridac, 199. 



Epiblast. See Ectoderm. 



EpicopiidjE, 245. 



Epicranium, 6. 



Epimeron, 21. 



Epiopticon, 39. 



Epipharynx, 6, 7, 49. 



Epiplemidx, 244. 



Episternum, 21. 



Erastria, 3 11- 12. 



Eriocephalida;, 231. 



EriocraniidsE, 231-2. 



Eristalis, 263. 



Erotylid^, 211-12. 



Eruciform larva. 106-109, ^''• 



Erycinidae. See Lemoniids. 



EucnemidjE, 217-18. 



Eugereon, 355. 



Eupterotidi, 246. 



Evaiiiidas, 273. 



Evolution, 1-2, 94, 128-129, ^4°" 



149. '57-159' 374-7^- 

 Eyes, 6, 7, 36-43 ; loss of, 287-8 ; 

 of Mayflies, 328. 



Face, 6. 



Facets of Eye, 37. 



Family, 152-155. 



Family life, 328-331. 



Fat-body, 57, 122. 



Feeding and reproduction, 125. 



Feelers, 8-10, 46, 48, 105, 324, 



327^ 372- 



Female insects, 324-8; reduction of 

 wings, 29; of eyes, 37. 



Female reproductive organs, 73-9. 



Femur, 22. 



Fertilization, 86. 



Fibres of nerves, 32 ; of muscles, 49. 



Fleas, 254-5 ; epipharynx, 7 ; 

 hatching, 101. 



Flies (two-winged) 250-68 ; eyes, 

 7 ; epipharynx, 7 ; feelers, 9 

 mandibles, 12 ; maxillx, 14, 16 

 hypopharynx, 19; thorax, 22 

 wings, 28; nerve-centres, 33 

 eyes, 39 ; ears, 46 ; air-tubes 

 59; food-canal, 67; eggs, 85 

 larvje, 108-9; P"P^» iiS; pup- 



