INDEX 



281 



Spinneret, of caterpillar, 57 

 Spiracles, 18-9 



of Bibio larva, 727, 128 



of blow-fly larva, 131-2, 133 



of caterpillar, 58-9 



of Diptera, vestigial, 133 



of dragon-fly, 50 



of Dyticus larva, 102 



of Eristalis larva, 201-2 



of Eristalis pupa, 202 



of gnat larva, 195-7 



of gnat pupa, 197 



of ground-beetle larva, 101 



of Tipula larva, 130 



of wireworm, 109 

 Spiracular siphon, 7957 

 Spring-tail, 3, 167, 777-2 

 Stable-fly. See " Stomoxys " 

 Staphylinidae, 228 

 Stelis, 238 

 Stem-mother, 71 

 Stenodictys, 262 

 Stenopteryx, 164 

 Stigmata. See " Spiracles " 

 Sting of Hymenoptera, 228 

 Stomach, 22, 23 



of butterfly, 55, 56 



of caterpillar, 55, 59-60 



of dragon-fly, 42, 47 



of grasshopper, 23 



of mayfly, 92, 93 



of muscoid larva, 134, 135 

 Stomoxys, 163 

 Stone-fly, 76-7 



See also " Plecoptera " 

 Stratiomyidae, 148 

 Strepsiptera, 118, 186 

 Stridulating organ of chafer larva, 

 in 



of Passalidae, 112 

 Sub-imago, mayfly, 96, 258 

 Sucker, 88 



apple-, 206, 207 

 Surface film, relation of aquatic 



larvae to, 102, 194-5, 197 

 Symphyta, 187, 270 

 Syrphidae, 148, 201-2, 228-9 



TACHINIDAE, 221-3 

 Tenebrio larva, 109, 257 

 Teneral insect, 52 

 Termites, 80-3 



wing-development, 68-70, 262 

 Termitoxeniidae, 766-7 

 Tertiary insects, 269-70 

 Testis, 27 

 Thorax, 12-13 



of aphid, 74 



of butterfly, 54-6 



of caddis larva, 122 



Thorax of capsid bug, 78 



of caterpillar, 58 



of Diptera, 126 



of dragon-fly, 41 



of grasshopper, 12-13 



of ground-beetle larva, 101 



of mayfly, 92 



of wireworm, 108 

 Thrips, 83-5 



Thysanoptera, 83, 179, 258 

 Thysanura, 169, 176-7, 253 

 Tinea, 231 

 Tipula larva, 128-30 



pupa, 259 

 Tomicus, 236 



Tongue. See " Hypopharynx " 

 Tortrix, 231 



Trachea. See " Air-tubes " 

 Tracheal gills, 



of Chironomus pupa, 192 



of mayily larva, 94, 9^; 



of stone-fly larva, 77 

 Transformation, 244-7 



of Insects, 248-51 

 Triacanthella, 772 

 Trichoptera, 121, 184 



cases, 122, 231 



larva, 722-3 



primitive types, 267, 268 



pupa, 141-2, 261 

 Triadosialis, 267 

 Triassic insects, 266-9 

 Triungulin, 116 

 Tsetse-fly, 163 



Turnip-fly. See " Phyllotreta " 

 ' Tussock " caterpillar, 232 

 Tympanum, 18 



VAGINA, 26 

 Vanessa, 209, 231 

 Vas deferens, 27 

 Volucella, 148 



WARBLE-FLY, 218-20 

 Wasp, digging, 227-8 



social life, 238 



See also " Hymenoptera " 

 Water-beetle. See " Dyticus " 

 Weevil, larva, 114-15 



pupa, 737, 138 



of Apple, 205 



of Beech, 214 



of Pine, 214 



of Vine, 214 



' White ant." See " Termite " 

 Wing, 75-77 



of Aleyrodes, 87 



of aphid, 72 



of butterfly, 54 



of caddis-fly, 122 



