ILLUSTRATIONS. 



Page. 



Fig. 1. — Bagworm ( Thyridopteryx ephemerxformk) 7 



2. — Bagworm; successive stages of growth 8 



3. — The imported elm leaf-beetle ( Oalerucella luteola) 11 



4. — White-marked tussock moth ( Orgyia leueostigma) 15 



5. — Tussock-moth caterpillar, first three stages 16 



6. — Tussock-moth caterpillar, last stages 17 



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



in successive stages 20 



8. — Ichneumonid parasites of tussock-moth caterpillar 21 



9. — Fall webworm (Ilyphantria cunea), moths and cocoons 26 



10. — Fall webworm, forms of larva and pupa 28 



11. — Fall webworm, larva and web. -. 29 



99 



(6) 



