132 THE INSECT WORLD. 
I saw one five feet above the soil, and this one deserves also to be 
described. It consisted of a blackish, rather short tube, which was 
built round a small branch of the poplar at the point where it 





Fig. 91.—Aphides and Ants (magnified). 
left the trunk. The ants reached it by the interior of the tree, 
which was excavated, and without showing themselves, they were 
able to reach their plant-lice by an opening which they had made 

