28 



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



ORDER COLEOPTERA. FAMILY PTINIDJE. 



I'-VK'T oi^^ cvsii: ir. 



60. The Pine Wood Perforator {Ptiiiidf). 



Small whit*> grubs Ijurrow through the dea^l wood of western yellow-pine logs, 

 causing rapid decay. Grants Pass, Greg. 

 Exhibit: Work. 



61. The Giant Arbor Vitee Ptinid (Ptinid). 



Small white grult.s boring in the dead heartwood of living giant arborvitM-, con- 

 tributing to the rapid decay of the heartwood. Port Angeles, Wash. 

 ExiiiniT: Work. 



62. The Giant Arbor Vitee Dryophilus (DryophUus sp. ). 



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

 arborvitie. It^ work is very common. Detroit, Greg., and Port Angeles, Wash. 

 "Represents a European family and genus heretofore unrecorded from North 

 America. ' ' ( Sch warz. ) 



Exhibit: Work. 



INJTJRY TO TWIGS BY BARK MAGGOT. ORDER DIPTERA, FAMILY 



CECIDOMYIID^. 

 PART OF CASE ir. 



63. The Pine Twig Maggot {Cecidomniid) . 



Minute rt'ddish maggot, living in the bark of terminal twigs of the western yellow 

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

 Common. 



Exhibit: Work. 



INJTJRY BY GALL INSECTS. ORDER HEMIPTERA, FAMILY 



APHIDIDiE. 

 CASE 18. 



64. The Sitka Spruce Gall-Louse {Chermes sibiricv^ f). 



A mimite insett forming cone-like galls on the terminal twigs of the Sitka spruce 

 at Xewp(jrt, Greg. Very common and injurious to young trees. 

 Exhibit: Work. 



65. The Englemann Spruce Gall-Louse ( Chermes sibiricux f, var. ). 



Same habit as t)4, but probably u variety or different species. Common on Kngle- 

 mann spruce at Sand Point. Idaho. 

 Kxiirnrr: Work. 



INJTJRY BY CICADA. ORDER HEMIPTERA, FAMILY CICADID^. 



CASK 18. 



66. Small Western Cicada {('irada sp. ). 

 Injuring twigs of Douglas sprui-e, St. Helen, Greir. 

 iixHiBiT: Adult and work. 



INJTJRY BY TWIG-MINER. ORDER LEPIDOPTERA. FAMILY 



TORTRICID^. 

 CASE 18. 



67. The Pine Twig-Miner ( Tortrlrid). 



A caterpillar of a moth with similar habits to that of the pine motii i)f Nantucket, 

 excavating burrows through the pith of the terminal twigsand shoots of young west- 

 ern yellow pine. Moscow Mountains, Idaho, where it was coumion and quite 

 injurious. 



Exhibit: Work. 



