ORGANIC RESPONSE 265 



not find blind fishes in such a situation. In many 

 of these forms " phosphorescent " organs or photo- 

 phores are developed which function either as lures 

 or as recognition lights or for the purpose of actually 

 furnishing an artificial light for the creature's needs. 

 The ants are relatives of the wasps and bees, al- 

 though their lives are mostly spent underground in 

 the complicated galleries which they excavate. 

 Their well-known structure is evidently well adapted 



FIG. 92. Ant-guests : Flies that live in ant-nests and are adapted 

 for life underground ; the one at the right is a male, the other two 

 females. (From Kellogg, after Wheeler.) 



to the peculiar life of the ant-nest. It is of great 

 interest to discover that representatives of other 

 groups of insects are found in ant-nests, and spend 

 their lives underground. These include beetles, 

 flies, crickets, roaches, and other types, but all of 

 them, in accommodating themselves to the conditions 

 of ant-life, have become altered (racially, of course, 

 not individually) to such an extent that they have 

 come to resemble ants and have lost their resemblance 

 to related species of their own kind. 



