404 



Index 



Viviparous reproduction, loi. 

 Volucella, 263. 



Walking of insects, 26. 



Warning colours, 320-1. 



Wasps, 279 : mandibles, 12 ; 

 wings, 28 ; taste - organs, 49 ; 

 sting, 69-70, 77-78 ; kidney- 

 tubes, 71 : testes, 82 ; pups, 

 118; intercrossing, 149: social 

 communities, 331-2 : fossils, 



363- 

 Water-beetles, 208-9, 289-91. 

 Water-boatmen, 191, 291. 

 Water-insects, legs of, 25 : larvz. 



1 12-14: life of, 288-96: not 



primitive, 351. 

 Water-scorpions, 190-1, 291. 

 Wax-glands, 70, 313-14. 



Weevils, 223-24. 360. 



Whirligig beetles, 208-9, 289-90. 



" White Ants." See Termites. 



Wingless insects, 29. 



Wings, 26-30 : development of, 

 102-103, 115, 122-123, 358: loss 

 of, 285-6 ; origin of, 350-2 ; 

 of fossil insects, 353-5. 



Wire-worms, 217. 



Wood-boring insects, 302-3. 



Workers, 332. 



XlPHTOlUM-EMBRTO, 92-93. 



Xylophagidz, 259. 



Yolk, 84 ; enclosure of, 96-97. 

 Yucca and Pronuba, 300-301. 



ZtGINIDX. 2 5 2. 



TURNBULL AND SPEARS, PRINTERS, EDINBURGH. 



