324 THE CANADIAN ENTOMOLOGIST 



Dendroctonus engelmanni Hopk. 



This species has not heretofore been reported (in literature) 

 from this State. The author collected two dead adults from their 

 characteristic mines under the bark of Picea engelmanni near 

 Sumpter, in the Blue Mountain Region of Northeastern Oregon. 

 Dendroctonus hrevicomis Lee. 



This is the most serious pest of pine in this State, and causes 

 the death of a vfery large amount of the largest and finest yellow 

 pine (P. ponderosa) timber of Eastern, Central and Southern 

 Oregon. Thousands of dollars are being expended annually in 

 combating the pest. 

 Dendroctomis pseudotsugce Hopk. 



Found in all parts of the State where Douglas fir grows. The 

 beetles seem to prefer dying, injured or down timber, but will at- 

 tack lr\dng, healthy trees as shown by a serious infestation in 

 Southern Washington and near White Pine, Oregon, where several 

 thousand trees were killed. 

 Dendrocto7ius obesus Mannh. 



A rather rare beetle working in the cambium of Sitka spruce, 

 Picea sitchensis, noted at Marshfield and Astoria. 

 Dendroctonus jeffreyi Hopk. 



This species is reported by Dr. Hopkins as occurring in South- 

 western Oregon. I have seen no specimens collected in this State. 

 Dolurgus pumilus Mannh. 



Oregon (Swaine 1908) in Picea sitchensis. 

 Dryocoetes autographus Ratz. 



A number of specimens referred to this species were collected 

 near Detroit, Oregon, from the bark of large Douglas fir windfalls. 

 Dryocoetes pseudotsugce Swaine. 



This species is not uncommon in the western part of the State. 

 At Ranier the adults were found in January, crowded into hiberna- 

 tion galleries in the outer bark of Douglas fir. In December near 

 Olney they were found under the bark of a Douglas fir stump, 

 when the bark was removed, the larvae were found to be actually 

 floating in water. Specimens brought into the laboratory ma- 

 tured, thus showing that they have adapted themselves to the 

 extremely wet winters of that section. Also noted at Cor\'allis 

 and Detroit, Oregon. 



