514 



FAMILY SCOLYTIDAE 



changes into a pupa within this. Fig. 333 and pi. xlix show pieces of bxirk 

 completely covered with the pairing-chambers, egg-galleries, larval galleries, 

 and pupating-chambers. The pupa turns gradually into the immature 

 beetle, and the latter remains for a time resting in the chamber whilst 

 its outer parts are slowly hardening and it is becoming darker in colour. 



YiG. 3^,3.— EgK and lar\ al .^^alleiies oU'oly^raphus trciuhi, Stel)., on inner bark of 

 Pinus i::crardiana. North Zhol), 1905. 



When fully mature, the beetle bores straight out of the bark by a 

 tunnel eaten out horizontally from the spot where it is lying. In the 

 case of the spring generation, when the weather is still comparatively 

 cold, as much as five weeks are probably spent in the larval stage and a 



