LIST OF PLATES 



Pl-ATE TO FACE PAGI 



I. A. Stick-insect moulting, b. Snowy-flies Frontispiece 



II. Eggs and Young Larvae of Warble-fly . . .108 



III. Wanderings of Warble-maggots in Cattle . . .110 



IV. Moths illustrating Mendelian Inheritance . . 122 



V. A. Gynandromorph Emperor Moth. b. Poplar Hawk 



Moth and Eggs • 132 



VI. Eggs and Young Larvae of Currant Sawfly . . 160 



VII. Nest and Comb of Social Wasps 182 



VIII. a. Nest of Tree-wasp cut open. b. Nest of Ground- 

 wasp DUG OUT BY Badger 224 



IX. Nest of Bumble-bee 226 



X. A. LooPER Caterpillars protectively marked. 



B. Nymph Cuticles of Stonefly .... 272 



XI. A. Parasitic Larvae on Caterpillar, b. Nest of 



Solitary Wasp , , 322 



XII. Insect Fossils from Palaeozoic Rocks, Carboniferous 



AND Permian . . . . . . . . 336 



XIII. British Lepidoptera (a) showing Regional Variation, 



AND (b) used to demonstrate MODIFICATION 



THROUGH Change of Food 356 



XIV. African Butterflies illustrating Seasonal Forms 



and Mimicry 374 



XV. Oak-apples and Root-galls of Alternating Seasonal 



Generations 386 



XVI. Late Larvae and Puparia of Warble-flies of Cattle 404 



