FOREST INSECTS. 
For treatises and shorter articles see Packard, 5th Rpt. 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. Sta., and Yearbk., Us: Dept. Agric. 'f 1904, 
pp- 387-404, 1905; Felt, 7th Ann. Rpt. Forest, Fish, and Game Comm., pp. 479- 534, 
1908. 
INSECTS INJURIOUS TO FORESTS IN THE NORTHWESTERN AND 
NORTHEASTERN UNITED STATES. 
NORTHWESTERN STATES. 
INJURY BY AMBROSIA BEETLES. ORDER COLEOPTERA, FAMILY 
SCOLYTIDZA. 
CAS Hie 
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 arborvitie. 
California to northern Oregon; also reported from Washington. 
Exuisit: Adult and work. 
2. Western Hemlock Wood-Stainer. 
Gnathotrichus sulcatus Lee. 
Excavates numerous branching galleries from a central burrow, the broods living 
in closely joined side chambers; in the sapwood and heartwood of western hemlock, 
Douglas spruce, giant arborvite, and lowland fir. California to northern Washing- 
ton; common in hemlock. 
Exuisit: Adult and work. 
3. The Western Pine Wood-Stainer. 
Tnathotrichus n. sp. 
Excayates 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. 
Exuisir: Adult and work. 
4. The Eastern Pine Wood-Stainer. 
Gnathotrichus materiarius Fitch. 
Excavates several branching galleries from a single-entrance burrow, the broods 
living in short side chambers in sapwood and heartwood of injured, dying, and 
recently felled pine and spruce. Eastern United Statesand Canada. Very common 
and injurious. 
Exuisit: Adult and work. 
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