Elm borer, Saperda tridentata Oliv. 

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

 \a 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 snout beetles, Magdalis sp. 



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 same, side view, natural size 



8 Pupa of same within its oval cell just beneath the bark, natural size 

 Sa Empty pupal cell of same, natural size 



9 Burrows of Magdalis barbita Say as exposed after removal of 



the bark, natural size 

 qa Holes in the bark through which the beetles escape, natural size 

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



Elm bark louse, Gossyparia spuria Mod. 



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



size 



1 1 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 



16^. Matured females on a twig, enlarged 



17 Pseudimago or wingless male, much enlarged 



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



a 338 



