ILLUSTRATIONS. 



Paee. 



FIG. 1. Bagworm ( Thyridopteryx ephcmerwformis) 5 



2. Bagworm ; successive stages of growth 6 



3. The imported elm leaf-beetle ( Galerucella luteola) 9 



4. White-marked tussock moth ( Orgyia leucostiyma) 13 



5. Tussock-moth caterpillar, first three stages 14 



6. Tussock-moth caterpillar, last stages 15 



7. Silver maple leaves eaten by larvae of white-marked tussock moth 



in successive stages 18 



8. Ichneumonid parasites of tussock-moth caterpillar 19 



9. Fall web worm ( Hyphantria cunea), moths and cocoons 24 



10. Fall web worm, forms of larva and pupa 26 



11. Fall webworm, larva and web 27 



4 



