21 



C^VSK l.i. 



47. The California White Fir Scolytus (Snih/tus jir.irefin Iat. ). 



Kxcaviik'H two, nearly straif^ht, transverse Jxalk'rk■^i from a central entrance burrow 

 anil basal cavity in livinj; bark and surface of wooil of California white tir. Mount 

 Siiastii, California, and ^'rand tir, Sand Point, Idaho. Closely allie<l in character and 

 liabits to No. 4S. 



Exuihit: Adult and work. 



48. The Fir Tree Destroyer {Scolytm mihscaber Lee). 



Ivxcavates two lonjr, nearly straight, transverse galleries from a central entrance 

 burrow and central or side cavity, in bark of living, injured, and declining gran<l (ir, 

 California white lir, and doubtless other species of tir. California to Hritish Cohnn- 

 l)ia, eastern Washington, and western and northern Idaho. The lu'aled-fjver wounds 

 in living trees cause serious defects and rapid decay of the heartwood. 



Kxuiurr: Adult and work. 



BABK AND WOOD-BORING GRUBS. ORDER COLEOPTERA, FAMI- 

 LIES BUPRESTID>ffi AND CERAMBYCIDiE. 



49. The Douglas Spruce Bark-Borer {AKemuin nUldiun Lee). 



A ?(>iin<l-lica<lcil, l)ark-l)oring grub, boring transverse and winding galleries in the 

 bark of living, injured, and declining Douglas sjtruce ami hendock. Ca.scade Moun- 

 tains, near Detroit, Oreg., St. Helen, Greg., and Port Williams, Wash. A very com- 

 mon and destructive enemy of the Douglas spruce. The healed-over wounds in the 

 wood cause serious defects, and the trees die from successive attacks. 



Exhibit: Adult and work. 



50. The White-Pine Sawyer {Monohammns srntellatux Say.). 



.\ large, whitish round-iieaded, bark and wood-boring grub, excavating burrows 

 through the sapwood and deep into the heartwood of fire-scorched, declining, dying, 

 dead, and recently felled mountain or silver pine. Kootenai, Idaho, and white pine 

 in eastern and northern United States. Common and destructive. 



Kxhirit: Ailult and work. 



51. The Ponderous Sawyer {Ergates spiculatus Lee). 



An exceedingly large, round-headed, bark and wood-boring grub, excavating large 

 and deep burrows in the sapwood and heartwood of dead and felled western yellow 

 pine; destructive to the wood of timber that has been dead or felled one or more 

 years. Southern Oregon. 



F^xiiibit: Adult and work. 



62. The Western Cedar Bark-Borer (Hi/lotntpes anietln/slinus Lee). 



A nieiliuMi-si/.ed bark and wootl-boring grub, excavating long, winding burrows in 

 the living bark and surface of the wood and boring into the sapw<iod of injurtnl, 

 dying, and recently felle(l giant arlK)f vit.T and incense cedar. Northern California 

 to Washington. 



Kxiiihit: Work. 



63. The Bronze Birch-Borer (.{(/rihis dtuinn (Jory). 



A long, flat-heade<l, slender, wood-l)oring grub, excavating long, winding burrows 

 in the bark and surface of the wood of living and injunKl birch an<l poplar trees in 

 northern Idaho, northern Maine, ami mountains of West Virginia; also reconled 

 from northern Michigan, New York, Pennsylvania. Virginia, Quebec, and Ontario. 

 A destructive enemy of the birches and poplar. 



K.yhibit: Adult and work. 



