78 



INJURY BY BARK-WEEVILS. ORDER COLEOPTERA, FAMILY 

 CURCULIONID^. 



l^^VKT OK CASK ir. 



57. The Sugar Pine Bark-Weevil. 



Pissodes sp. 



Adult siiont-beetle deposits eggs in the outer bark of young living and injured 

 sugar pine, producing small whitish grubs which mine through the inner bark and 

 cliangt' to the adult in oval cavities excavated in the surface of the wood, causing the 

 death or abnormal development of the trees. Gi'ants Pass, Oreg. 



Exhibit: Work. 



58. The Douglas Spruce Twig- Weevil. 



Ciirctdimiid. 



A small snout-beetle which deposits eggs in cavities in the bark of the small cen- 

 tral shoots and terminal twigs of young, living Douglas spruce. The small whitish 

 grubs mine through the inner bark and enter the pith to change to the adult, killing 

 the twigs and causing a deformed development of the tree. St. Helen, Oreg. 



Exhibit: Work. 



59. The Pine Fungus-Gall Weevil. 



Ctirodiotiid. 



A small snout-beetle breeding in the bark and wood of a common fungus gall on 

 the shore pine and western yellow pine, causing the death of the branches and young 

 trees. Newjiort, Oreg., and Moscow Mountains, Idaho. 



Exhibit: Work. 



INJURY TO DEAD WOOD AND BARK BY POWDER-POST BEETLES. 

 ORDER COLEOPTERA, FAMILY PTINIDiE. 



PJ^IZV OK CASK IT. 



60. The Pine Wood Perforator. 



I'tiiiid / 



Small white grubs burrow through the dead wcxid of western yellow pine logs, caus- 

 ing rapid decay. (Irants Pass, Oreg. 

 Exhibit: Work. 



61. The Giant Arborvitae Ptinid. 



Fti)ud. 



Small white grubs boring in the dead heartwood of living giant arborvita^, con- 

 tributing to the rai>id decay of the heartwood. Port .Angeles, Wash. 

 Exhibit: Work. 



62. The Giant Arborvitae Dryophilus. 



Dri/ophihis sp. 



A small whitish grub and brownish beetle, breeding in the outer bark of the giant 

 arboi\ita>. Its work is very common. Detroit, Oreg., and Port Angeles, Wash. 

 "Represents a European family and genus heretofore unrecorded from North 

 America." (Schwarz. ) 



Exhibit: Work. 



INJURY TO TWIGS BY BARK MAGGOTS. ORDER DIPTERA, 

 FAMILY CECIDOMYIID^. 



r-ART OK CASK ir. 



63. The Pine Twig-Maggot. 



Cecidomjiiid. 



Minute reddish maggot, living in the bark of terminal twigs of the western yellow 

 pine, causing the leaves to turn yellow and die. Moscow Mountains, Idaho, 

 ('ommon. 



Exhib't: Work. 



