146 CURIOUS HOMES AND THEIR TENANTS. 



shall make it impossible to meet or interfere with the 

 burrows made by their brothers and sisters, those at 

 the extreme ends running very obliquely, while those 

 in the center are almost at right angles to the pas- 

 sage from which they started. Indeed, looking at the 

 illustration, it becomes very plain that, as the grubs 

 go on growing larger and their galleries widening to 

 accommodate their increasing proportions, if they all 

 started on parallel lines their galleries would soon run 

 together and the grubs could not come at their proper 

 amount of food. When they make their way into 

 daylight they become full-winged beetles. 



Walkint^-stick insects. 



