Ants. 



Fig. 10. THE SLAVE ANT (Formica Juscd). 



V. 



I. It is hardly necessary to say that, as a general 

 rule, each species of Ant lives by itself. There are, 

 however, some interesting exceptions. One little 

 kind of ant is found exclusively in the nests of the 

 much larger Horse Ants. We do not know what 

 the relations between the two species are ; the small 

 ones, however, follow the Horse Ants when they 

 change their nest, running about among them and 

 between their legs, tapping them inquisitively with 

 their antennae, and even sometimes climbing on to 

 their backs, as if for a ride, while the large ants seem 

 to take little notice of them. They almost seem to 

 be the dogs, or perhaps the cats, of the ants. 

 Another small species, which makes its chambers 

 and galleries in the walls of the nests of larger 



