FOREST I:NSECTS. 



For treatises and shorter articles see Packard, oth Rjit. U. S. Ent. Comm., 1886-90; 

 Hopkins, Buls. 21, 28, 32 and 48, Div. Ent., U. S. Dept. Agric, Buls. 16, 17, 31, 32, 

 35, 36, and 56, W. Va. Agric. Exp. 8ta., and Yearbk., U. 8. Dept. Agric. f. 1904, 

 pp. 387-404, 1905; Felt, 7th Ann. Rpt. Forest, Fish, and Game Connn., pp. 479-534, 

 1903. 



INSECTS INJURIOUS TO FORESTS IN THE NORTHWESTERN AND 

 NORTHEASTERN UNITED STATES. 



NORTHWESTERN STATES. 



INJURY BY AMBROSIA BEETLES. ORDER COLEOPTERA, FAMILY 



SCOLYTIDJE. 



C^SE 1. 



1. The "Western Platypus. 



Platypus n. sp. 



Excavates long, oranching galleries in the sapwood and neartwood of injured, 

 dying, and recently felled Douglas spruce, western hemlock, and giant arborvitic 

 California to northern Oregon; also reported from Washington. 



Exhibit: Adult and work. 



2. Western Hemlock Wood-Stainer. 



Gnathotrichus sulcatus Lee. 



Excavates numerous branching galleries from a central l)urrow, the broods living 

 in closely joined side chambers; in the sapwood and lieartwood of western hemlock, 

 Douglas spruce, giant arborvit», and lowland lir. California to northern Washing- 

 ton; common in hendock. 



Exhibit: Adult and work. 



3. The Western Pine Wood-Stainer. 



GnutJioh-iehus n. sp. 



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

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

 yellow pine and Douglas spruce. Cascade and Rocky Mountain region, California to 

 northeastern Washington. 



Exhibit: Adult and work. 



4. The Eastern Pine Wood-Stainer. 



Gnathotrichus muteriarius Fitch. 



Excavates several branching galleries from a single-entrance Inirrow, the broods 

 living in short side chambers in sapwood and heartwood of injured, dying, and 

 recently felled pine and spruce. Eastern United States and Canada. \'ery common 

 and injurious. 



Exhibit: Adult and M'ork. 



70 



