THE ANIMAL KINGDOM. 



227 



nearly always a pair of typographers enter the tree together 

 by perforating the bark, and this first task accomplished, 

 they hollow out at this spot a central gallery, which is 



137. Nuptial Chamber of the Pine Hylesiruis, of natural size, and the Insect enlarged. 



nothing more or less than a nuptial chamber for the two 

 spouses. Here, resolved to make their lives as agreeable 

 as possible, they pierce for this purpose two to four holes in 

 the bark, which are simply ventilators, intended to air the 

 little chamber, and possibly also to light the windings. The 

 female lays her eggs all along the chamber; she l)rings forth 

 from fifty to a hundred, and it is after having left this that 



