134 HOME STUDIES IN NATURE. 



the same excitement with which her own body was 

 quivering, until the whole army was aroused and on 

 the homeward road. Yery soon there was a host of 

 eager milkers among the drove. But a large part of 

 the army retired within the city, where they were fed 

 by the milkers. ]STow that the invading force was with- 

 drawn, the troops of the threatened colony also disap- 

 peared, only a few sentinels remaining to watch over 

 the milkers and herd. 



A tribe of Formica (F. gagates) also makes stock- 

 raising its principal means of support, but the herds are 

 entirely different from those of the Crematogasters : 

 they do not graze in open fields, but are stabled, and 

 feed on the roots of various plants. Underground sta- 

 bles are made expressly for them. The earth is re- 

 moved from around the tender roots, and the dun-col- 

 ored cattle are clustered in small groups around the 

 roots upon which they are feeding. The groups are 

 arranged so as to enable the milkers to pass easily and 

 freely among them. 



I have often carefully opened the stables, but the 

 owners always resented it, and carried the cows away 

 to subterranean galleries beyond my sight. When the 

 stables were reclosed, in due time they were brought 

 back and disposed in the same regular order. 



There are two distinct races of slave-makers among 

 these humble creatures, who capture and hold slaves to 

 carry on their domestic affairs. Polyergus luoidus is 

 the more remarkable of the two, and it would require 



