TOMICUS TYPOGRAPHUS. 



241 



are normally rare in Britain, may occur unexpectedly in some 

 numbers and prove destructive, it is desirable that the forester 



a Pairing-chamber. 

 /) Mother-gallery. 



c Air-hole. e Flight-hole. 

 (I Larval -galleries. 



should be acquainted with the economy of such species as 

 the present, so as to be prepared to meet a contingent out- 

 break, which is by no means impossible. T. typocjraphns, L., 

 F.p. R 



