Index 



ticks, 3 



tiger-moth, larva of. Fig. 40 



tools, use of, 109 



touch, sense of, 67; Fig. 38 



tracheae, 35; Fig. 17 



tracheal gills, 12, 13, 41, 115; Figs. 22- 



24 

 Trichoptera, 19; Fig. 32 

 Trilobita, 3 

 trochanter, 27 

 trophallaxis, 98 

 true bugs, 7, 15 

 tsetse flies, 20 

 turnip gall-weevil. Fig. 73 

 twisted-winged insects, 25 

 tymbal, 65 

 tympanal organs, 63 



uterus, 49 



vagina, 49 



veins of wing, 29, 80 



ventral, 27, 29 



vertex of head, 61 



viruses, transmitted by insects, 128 



walking, 74 



warble-flies, 128; Fig. 44 



warning colouration, 116 



wasps, 21, 22; Fig. 60 

 habits of, 100 

 wingless. Fig. 62 



water- 

 beetles, 25, 39, 76, 115; Figs. 21, 51 

 boatmen, 16, 76, ii5i Fig. 5ie 



water- 



'bugs', 10 



water- 

 bugs, 39, 115; Figs. 19, 51 

 measurers, 76 

 scorpions, 16, 76, 115 



web-spinners, 12 



weevil. Figs. 66, 73 



whirligig beetles, 25, 76; Fig. 5 id 



'white ants', 14 



whitefly, 16 



wind, 



effect of on migration, 91 

 spread of insects by, 85 



wing-beat, frequency of, 82 



wing-cases, 25 



winged insects, 4 



wingless insects, 4, 21 



wing-muscles, 79 



wing-pads, 6; pi. 12; Fig. 14 



wings, 3, 29; Figs. 14, 15 

 action of, in flight, 83 



wing-veins, 80 



wireworms, 75; Frontispiece 



wood-boring insects, 22 



wood, digestion of, 14, 45, 98 



woodroaches, 10 



wood-wasps, 22 



'woolly bear'. Fig. 40 



worker-bees, 103 



worms, I 



Xylocopa, 117 



yellow fever, 128 

 yellow jackets, 100 



Zoraptera, 15 

 Zygoptera, 13 



139 



