74 



29. The Redwood Bark-Beetle. 



PJdoeosinns sequoisc Hopk. 



Excavates a long, straight, longitudinal gallery from a basal chamber in living 

 l)ark <if injured, declining, and recently felled redwood and giant arborvitse. Cali- 

 fornia to northern Washington. Very common in redwood. 



Exhibit: Adult and work. 



30. The Western Pine-Destroyer. 



Dendroctomis hrericomix Lee. 



Excavates long, winding galleries through the bark of living and injured western 

 yellow pine and sugar pine. Cascade and Rocky Mountain region, New Mexico to 

 British Cohim!)ia. Closely allied with the destructive pine bark-beetle of the East 

 and capable of great destrut-tion of the largest and best timber. 



Exhikit: Adult and work. 



CASE ©. 



31. The Dark-Red Turpentine-Beetle. 



Dendroctonus valens Lee. 



The largest North American bark-l^eetle. Excavates verj'^ broad and long primary 

 galleries, the Iiroods develoj)ingin Ijroad side chambers in the bark of living, injured, 

 dying, and recently felled western yellow j)ine, lodgepole pine, and doubtless most 

 of tlie other wi'stern pines. California to British Columbia and eastward to Kansas 

 and noitlierii Michigan. A variety extends into the eastern United States. Common 

 and injurious, l)ut not necessarily destructive to living timber. 



Exhibit: AduH and work. 



32. The Mountain Pine Dendroctonus. 



Dendroctonus n. sp. 



A medium-sized black bark-beetle, excavating very long, winding galleries in the 

 bark of living, injured or declining, and recently felled mountain or silver pine and 

 sugar pine. Northern California to Washington eastward to Idaho and Montana. 

 Very common and cai)a))le of great destruction of the best timber. 



Exhibit: Adult and work. 



Cj?i.SES O ^^ND lO. 



33. The Douglas Spruce Dendroctonus. 



J>i')i<lroct(>inis n. sp. 



{Dendroctonus similis in Bui. 21, n. s.. Division of P]ntomology. ') 

 A large, reddish bark-beetle, excavating long longitudinal, slightly curved primary 

 galleries in the bark of living, injured, and recently felled Douglas si)rnce and west- 

 ern larch. New Mexico to British Columbia, Pacific coast and eastward through the 

 mountain regions. Very common and cai)able of destroying much valuable timber. 

 Exhibit: Adult and work. 



CASE lO. 



34. The Western Pine Hylurgops. 



Ifylurgojis suJ)Costtdatus Mann. 



Excavates short, slightly curved, longitudinal galleries in the living bark of 

 injured, dying, and rei-ently felled sugar pine, silver pine, western yellow pine, 

 lodgepole pine, and prol)al)ly other pines on the Pacific coast. Cascade and Rocky 

 Mountain region. Conunon. 



PyXiiiBiT: Adult and work. 



35. The Sitka Spruce Hylurgops. 

 If[/lurg<t/>s rugipennis Mann. 



Excavates a short, curved, longitudinal and subtransverse gallery from an entrance 

 in the living ])ark of injured, dying, ami recently felled Sitka .spruce and shore pine. 

 Coast region, ('alifornia to Washington and Alaska. 



Exhibit: Adult and work. 



