258 PROTECTION AGAINST INSECTS. 



In the secondary galleries, and on the partitions, white fungous 

 mycelia (Monilia Candida) appear, which are also devoured, 

 not, as was formerly supposed, because they are the chief food 

 of the larvae, but to clear the way for the larvae. 



Later on, the walls of the galleries and the adjoining wood 

 become black owing to fungoid growth. 



The beetles damage the commercial value of the wood, the 

 finest stems being frequently bored like a sieve, and rendered 

 useless for most purposes. The insect is most frequently 

 found in forests where much wood is broken by wind or snow, 

 and where there are winter-fellings. 



d. Protective Rules. 



i. Immediate removal of all sickly coniferous trees and 

 of broken wood and stumps from the forest. The latter 

 should at least be barked, if their timely removal is not 

 advisable. 



ii. Felling in the growing season, and immediate removal 

 of the bark. 



It may happen, when the beetle is in great numbers, that 

 barked trees may be attacked. If winter-felling cannot be 

 avoided, and barking is impossible, the wood should be 

 removed before March. 



e. Remedial Measures. 



i. Tree- traps may be felled in July and August to attract 

 the beetles about to lay. These trees must be barked and split 

 open to destroy the larvae, and fresh tree-traps provided 

 continually till October. 



ii. Firewood may be used as traps, but must be removed 

 from the forest before the beetles come out. 



9. Tomicus domcsticus, L. 



a. Description. 



Beetle 3 to 4 mm. long. Similar to the preceding species 

 but more elongate, with the prothorax entirely black ; the 

 elytra livid yellow, regularly punctate-striate, and impressed 



