374 OHTD EXPERIMENT STATION: BULLETIN 332 



PLATE XXII 



THE BAG OR BASKET WORM 



( Thyridopteryx ephemeraeformis) 



10. "Bag or larval case as seen in winter, natural size. 



11. Same as preceding but cut open to show the pupal case and the eggs. 



12. Several eggs, very greatly enlarged. 



13. Side view of recently hatched larva, greatly enlarged. 



14. Cases of young larvae on twig, natural size. Notice that the dark 

 ones are on the dark bark and the light ones on the light bark. 



14a. Leaf eaten by young larvae, natural size. 



15. Older larvae in their bags which are ornamented with pieces of leaves, 

 one is on the leaf, another hanging from the edge and a third dangling by a 

 thread, natural size. 



16. Full-grown larva removed from its case, natural size. 



17. Full-grown larva walking with its case, natural size. 



19. Wingless female moth, natural size. 



20. Male moth with wings spread, natural size. 



22. Bag of male hanging from the leaf and with the empty pupal case 

 protruding from its lower extremity, natural size. The leaf in front of the bag 

 shows the work of half grown larvae." 



After Felt. 



