IV 



SOCIAL HOMES 



139 



the opening to the underground apartments is a mass 

 of gravel, which may accumulate into a little heap, 

 and beyond extends the smoothed belt of ground with 

 circulatory margin. Entrance to the interior is by 



FIG. 22. Fragment taken from the trunk of an oak inhabited by Fuliginous 

 Ants ; from Huber. 



one, two, or more gates ; apparently the tendency is 

 to increased numbers in nests with cones and mounds. 

 Immediately within the gate is a vestibule, smooth, 

 and from one to two inches wide, which, at a 

 distance from the entrance of from half an inch to 



