THE CANADIAN ENTOMOLOGIST 325 



Eccoptogaster unispinosus Lee. 



A species widely distributed in the State, works in Larch 

 {Larix occidentalis), Douglas fir {Pseudotsugce taxifolia), and 

 Engelmann Spruce (Picea engelmanni). It is not uncommon in 

 the thin bark of Douglas fir saplings, and limbs of older trees. 

 It was recently bred from thick bark taken from near the base 

 of a large tree, here the species evidently spent its full life cycle 

 in the bark never reaching the cambium. It often causes the 

 death of saplings and young poles. 

 Eccoptogaster, n. sp. 



A species resembling unispinosus in size and form but differ- 

 ing in the spines was taken in numbers from the twigs of a dying 

 Grand fir [Abies grandis) at Corvallis, in September, 1916. 

 Eccoptogaster siibscaber Lee. 



Found throughout the State working in Abies, especially A. 

 grandis. The adult makes a short transverse gallery from 1 to 3 

 inches long, 30 to 50 eggs are deposited, and the larva' work up 

 and down the tree. (They are doing considerable damage at 

 Klamath Lake in white firs). These larval mines are often a foot 

 long; the pupal cells may be wholly in the bark, wholly in the 

 wood, or partly in each. It is not unusual to find a tree so heavily 

 attacked that it would be impossible to find a square inch free 

 from mines. Larva, pVipa and adults were taken at Ashla"nd,' 

 Oregon, June 21, 1916. 

 Gnathotrichus sulcatus Lee. 



Common in dying trees, especially in the western portions 

 of the State. This ambrosia beetle has been taken from Abies 

 grandis, A. nobilis, Pseudotsuga taxifolia and Tstiga heterophylla. 

 Noted at Corvallis, Detroit, Astoria, and in the Blue Mountain 

 Region. 

 Gnathotrichus retusus Lee. 



A similar species found in Tsuga heterophylla, Pinus contorta, 

 P. ponderosa and Pseudotsuga taxifolia. Most abundant in the 

 Coast Range and Blue Mountains. 

 Gnathotrichus sp. 



A species which I am unable to place among the described 

 species was taken from Alder {Alnus oregona) at Florence, Oregon, 

 in Apnl, 1914. 



