CATALOGUE OF HXHIBIT. 



Section I.— INSECT ENEMIES OF FORESTS IN THE NOUTI I WESTERN 



AND NORTHEASTERN UNITED STATES. 

 Section II.— INSECT ENEMIES OF FORESTS IN (GENERAL. 

 Section III.— SPECIAL INVESTKiATIONS. 

 Section IV.— PHOTOiJRAPIIS. 



SECTION ]. 



INSECT ENEMIES OF FOREST TREES IN THE NORTHWESTERN 

 AND NORTHEASTERN UNITED STATES. 



NORTHWESTERN STATES. 



INJTTRY BY AMBROSIA BEETLES. ORDER COLEOPTERA, FAMILY 



SCOLYTIDiE. 



C-a.se 1. 



1 . The Western Platypus ( PJati/pus n. sp. ) . 



Excavates long, lirancliing galleries in the ^apwood and heartwood of injured, 

 dying, and recently felled Douglas spruce, western hemlock, and giant arl)or vitaj. 

 California to northern Oregon; also reported from "Washington. 



Exhibit: Adult and work. 



2. "Western Hemlock Wood-Stainer {Gnathotrichns sulcahi.'i I^c. ). 



Excavate.^ numerous branching galleries from a central burrow, the broods living 

 in closely joined side chambers; in the sapwood and heartwood of western hem- 

 lock, Douglas spruce, giant ar1)or vitiv, and grand fir. California to northern "Wash- 

 ington; common in hendock. 



ExiiiiiiT: Adult and work. 



3. The Western Pine Wood-Stainer {Gnatholrichus n. sp. ). 



Excavates transverse galleries in the surface of the wood and Itranching ones deep 

 in the sapwood and heartwood, the broods living in short side chanibers; western 

 yellow j)ine and T)ouglits spnicp. CsisoA<le and Rocky Mountain region, California 

 to northeastern Wa.^hington. 



Exhiiut: Adult and work. 



4. The Eastern Pine ■Wood-Stainer {(innihutriilmn uinlirliiriiiM Fitch). 

 Excavates several branching galleries from a single-entrance burntw. the broo<ls 



living in short side chamb«'rs in sapwood and heartwoo<l of injured, dying, and 

 recently felled pineand spruce. Ex«tern I'liite*! States an<l Canada. Very couuuon 

 and injurious. 



Exhibit: Adult and work. 



1.^ 



