ON THE LIFE HISTORIES OF FOREST INSECTS 29 



usually dies there, 

 or if it pupates the 

 moth very rarely 

 matures so as to be 

 recognizable. Ifthe 

 caterpillar has 

 pupated the pupal 

 chamber contracts 

 as the wood dries 

 and shrinks, and 

 the pupa is killed 

 or the moth is de- 

 formed and unre- 

 cognizable. A use- 

 ful plan to obtain 

 the moth (and it 

 can be made to 

 apply to securing 

 some of the bast- 

 and sapwood-feed- 

 ing beetles also) 

 is to envelop the 

 part of the stem 

 of a tree in which 

 you have marked 

 down one of these 

 pests with mos- 

 quito-netting, tying 

 it tightly above and 

 below round the 

 bark, and catch the 

 moth when it issues 

 in this manner; or 

 cut the whole tree 

 into sections and 

 place them in a 

 large insectary or 

 breeding cage, and 

 catch the moths as 

 they issue from the 

 stems, as I was able 

 to do with the 

 moths Duomitus 

 ceramicus and D. 

 leuconotus. 





FlG. 1 8. "Weathering" action set up in the sapwoot 

 tree at the point of attack of the caterpillar of 

 ceramicus. A, the point at which the grub tunnelled into the 

 wood to pupate. 



