178 



INSECT LTFE. 



canal.* Try 7 to observe the excretion of honey- 

 dew. 



9. Find a colony of aphids that is attended by 

 ants, and determine why the ants are there. 



INSECTS THAT PREY UPON APHIDS. 



THE APHIS-LIONS (Field and School lVcr).Look 

 among colonies of aphids for aphis-lions. These are 

 spindle-shaped larvae, with very long, slender, curved 

 jaws ; one of these larvae is represented on the lower 

 left leaf in Fig. 147. The aphis-lions are most easily 



FIG. 147. Eggs, larva, cocoon, and adult of Chrysopa. 



found in those colonies of aphids that live within 

 curled leaves. 



i. Remove a small branch bearing a colony of 



* M. Biirgen. Der Honigtau. Jenaische Jeitschrift, Bd. xxv (1891), 



s. 387-428. 



