132 



THE INSECT WOELD. 



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 



