Explanation of Plate 3.' 



Elm Poorer {Saperda tridentata Oliv.). 



1. Larva or grub within its burrow just under the bark, natural size. 

 la. Larva or grub extended, natural size. 



2. Pupa within its cell just under the bark, natural size. 



3. Burrows of the grub as exposed after removal of the bark, natural size. 



4. Adult beetle, line beside it shows its natural size. 



Elm ,3nout beetles {Magdalis). 



5. Adult of Magdalis armicollis Say, line beside it represents its natural size. 



6. Adult of Magdalis barbita Say, line beside it represents its natural size. 

 6a. Side view of same. 



7. Larva of Magdalis barbita, side view, natural size. 



8. Pupa of Magdalis barbita within its oval cell just beneath the bark, natural size. 

 8a. Empty pupal cell of Magdalis barbita, natural size. 



9. Burrows of Magdalis barbita as exposed after removal of the bark, natural size. 

 9/7. Holes in the bark through which the beetles escape, natural size. 



gb. Showing how bark is loosened by the burrows of this insect, natural size. 



Elm r> ar ^ Louse {Gossyparia idmi Geoff.). 



10. Group of partly grown bark lice as they appear in early spring, natural size. 



11. Group of male cocoons, natural size. 



12. Group of male cocoons, much enlarged. 



13. Group of virgin females, much enlarged. 



14. A female, much more enlarged. 



15. Recently hatched young, very much enlarged. 



16. Mature female, much enlarged. 

 16a. Mature females on a twig, enlarged. 



17. Pseudimago or wingless male, much enlarged. 



18. Winged male, much enlarged, note also the long, white, anal filaments. 



*Executed from nature, under the author's direction, by Mr L. H. Joutel of New York city. 



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