S HA DE F EEE INS ECTS 
about three inches long. This is the lunate long-sting, Thalessa 
lunator Fabr., or the largest of our native ichneumon flies. The 
larva is parasitic upon the larve of the borer under consideration, 
and prevents them from becoming sufficiently injurious to required 
special treatment. 
153. This borer is usually found in dead wood, and its work 
is stopped when this is properly removed and the cavity filled. 
22. BLACK CARPENTER ANT 
Family FORMICID. Species Camponotus herculaneus Linn. 
154. he large black ants frequently found in hollow or decay- 
ing trees generally belong to this species. It is usually found in 
decaying trees, but after it once gains an entrance to the heart- 
wood of a number of kinds of trees, it can do extensive damage 
by burrowing through the heart-wood, in which it makes its nest. 
155. It is hard to check their work, except by digging out the 
affected wood and destroying the nest, or by fumigating the cavity 
with hydrocyanic acid gas or carbon bisulphide. If you are sure 
that the cavity is such that the fire can be controlled and prevented 
from spreading farther than desired, the same results can be secured 
by burning out the cavity. This, however, is a dangerous practice. 
