THE CANADIAN ENTOMOLOGIST 353 



AX ANNOTATED LIST OF THE SCOLYTID BEETLES OF 



OREGON. 



BY W. J. CHAMBERLIN, OREGON EXPERIMENT STATION, 



CORVALI.IS.'ORE. 

 (Continued from page 328.) 

 Pliloeosinus dentatiis Say. 



A single specimen collected from Chamacyparis noolkalensis 

 at Elk Lake, Oregon. 

 PhloeosiUus punctatus Lee. 



This beetle was found doing considerable damage to the 

 juniper {Jiiniperus occidentalis) in the vicinity of Bend and Prine- 

 ville, in Central Oregon. Both male and female work, excavat- 

 ing a short gallery 13^4 to 1^ inches long, running with the grain 

 of the wood. Eggs are deposited in nitches on each side of the 

 gallery and are sealed in by a w^all of frass. The young larvae 

 work out at more or less right angles to the egg gallery. Eggs, 

 lar^ce and pupae were collected in early May at Bend. Com- 

 pleted egg galleries of the same species were found in Incense 

 cedar {Libocedrus deciirrens), on the Klamath Indian Reserva- 

 tion a month later. It has been taken from its galleries in Western 

 red cedar {Thuya plicata), Alaska cedar {Chamcecyparis noot- 

 katensis), and Port Orford cedar, {ChamcEcyparis lawsoniana), in 

 the western part of the State. It probably attacks all the trees 

 of the juniper and cedar group. The cocoons of an unidentified 

 hN'menopterous parasite were found in the mines in juniper. 



Phloeosinus cristatus Lee. 



This species is rare; attacks Alaska Cedar {ChamcEcyparis 

 nootkatefjsis), Noble fir (Abies nobilis), and Engelmann Spruce 

 (Picea engelmanni). 

 Phloeosinus sequoia Hopk. 



Occurs in Thuya plicata and Sequoia sempervirejis in the 

 southwestern portion of the State. 

 Pseudohylesinus nebulosus Lee. 



The adults of this species emerge in March in the Willamette 

 Valley. After emergence, no time is lost in attacking a new host. 

 Douglas Fir is their principle hcst tree and living, dying or felled 

 trees, especially in the sapling and pole stages are favourites. When 



October, 1917 



