ICHNEUMONES 
51 
31. Ichneumones. — Another 
interesting division of the Hy- 
menoptera includes the Ichneu¬ 
mones. We have already seen 
(page 41) how they help to keep 
the Lepidoptera from becoming 
a scourge. They also furnish 
other interesting examples of 
parasitism. As an illustration 
we may use one of the larger 
ones known as Thalessa. With 
long, thread-like drills this para¬ 
sitic insect bores holes in trees, 
and lays an egg at the bottom 
of the hole. The egg is usu¬ 
ally laid near the burrow of 
one of the larger tree borers, 
the Tremex. 
Figure 40. —Tongue of 
Honey-bee. 
Notice the numerous hairs of 
the tongue and palps. 
Figure 41. — Model Apiary. 
