PINE-BEETLE. 



269 



in thousands after an autumnal storm. Sometimes two 

 beetles are found in the same twig, and some beetles hiber- 

 nate in them, but this is probably a rare occurrence. Owing 

 to the loss of these bored twigs, the crowns of trees, if 

 repeated!}' attacked by the pine-beetle, acquire a characteristic 

 appearance which may be recognised from a distance. They 







tlf in tbe 



acquire the form of the cypress instead of possessing the 

 usual dome-like shape, and here and there a few side-branches 

 which have been spared may project outwards from the 

 tree (Fig. 129). This curious aspect of the trees has 

 given to the insect the appellation of Ilortidanus naturae 

 (" Waldgiirtner " or Pruner). 



Besides the direct damage (loss of increment, diminution of 

 the seed-harvest) inflicted on attacked trees by the reduction 



