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Joulet, L H
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Fall Web Worm and Spiny Elm Caterpillar: FAll Web Worm (Hyphantria cunea Drury): 1. Cluster of eggs; 2. Dorsal views of full and partly grown larvae and also a lateral view of a full grown caterpillar; 3. Pupa; 4. Pupa; 5. White form of moth in resting position; 6. Spotted form of moth with wings expanded. Examples 2,5, and 6 are on a small web showing within the partly skeletonized discolored leaves and the frass or excrement of the caterpillars.
Spiny Elm Caterpillar (Euvanessa antiopa Linn.): 7. Cluster of eggs on a leaf stem; 8. One egg; 9. Caterpillar feeding; 10. Chrysalis hanging from a leaf stem; 11. Butterfly with wings spread, natural size. The figues of the egg and caterpillar are on a twig of elm representing the characteristic work of the caterpillar
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Elm Borers and Elm Bark Louse : Elm Borer (Sapreda tridentata Oliv.). 1. Larva or grub within its burrow just under the bark; 1a, Larva or grum extended; 2. Pupa within its cell just under the bark; 3. Burrows of the grub as exposed after removal of the bark; 4. Adult beetle.
Elm Snout Beetles (Mardalis): 5. Adult of Magdalis armicollis Say; 6. Adult of magdalis barbita Say; 6a. Side view of same; 7. Larva of Magdalis barbita, side view; 8. Pupa of Magdalis barbita within its oval cell just beneath the bark; 8a Empty pupal case of Magdalis barbita; 9. Burrows of Magdalis barbita as exposed after removal of the bark; 9a. Holes in the bark through which the beetles escape; 9b. Showing how bark is loosened by the burrows of this insect.
Elm Bark Louse (Gossyparia ulmi Geoff): 10. Group of partly grown bark lice as they appear in the early spring; 11. Group of male cocoons; 12. Group of male cocoons; 13. Group of females; 14. Female; 15. Recently hatched young; 16. Mature female; 16a, Mature females on a twig; 17. Pesudimago or wingless male; 18. Winged male.... Note also the long, white, anal filaments
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