354 THE CANADIAN ENTOMOLOGIST 



such timber is not available the limbs of larger trees are selected. 

 The female starts the gallery and is soon followed by the male. 

 The entrance gallery is at an oblique angle, and upon reaching the 

 cambium a gallery is run parallel to- the grain by the female. 

 The male works in the opposite direction. The eggs are deposited 

 in little nitches chewed out by the female. The eggs hatch in 5 

 to 7 days and the larvae work out at more or less right angles. 

 Pupation takes place in the bark. The parent adults die in the 

 mine after the eggs are deposited. In most cases the male is found 

 blocking the entrance with his dead body, and the body of the 

 female is found at the far end of the gallery. Observed in both 

 Eastern and Western Oregon. 

 P seudohylesinus nohilis Swaine. 



This species was found entering the thick, flinty bark near 

 the base of large, living Abies nobilis in the Cascade Mountains 

 in August, 1914. 

 P seudohylesinus laticollis Swaine. 



Found with the above species on Abies nobilis and later taken 

 from Abies lasiocarpa. 

 P seudohylesinus, n. sp. 



A very large specimen taken in the act of boring into Lebanon 

 Cedar {Cedriis leboni), on the College grounds. 

 P seudohylesinus undescribed species allied to nebulosus Lee. • 



A number of specimens in the collection taken at Elkton, 

 Oregon. February 16, 1896. No host given. 

 Pseudohylesimis griseus Swaine. 



This species is less common than P. nebulosus, but in habits, 

 life history, etc., is very similar. Found attacking Douglas fir 

 at Breitenbush Hotsprings in the Cascade Mountains in April. 

 P seudohylesinus sericeus Mannh. 



Very similar to last two. Bred in numbers from Douglas fir 

 collected at Corvallis, Astoria, and Detroit, Oregon. 

 P seudohylesinus sericeus var. 



A species differing considerably in size and markings. It 

 was bred from Douglas fir at Corvallis in August. 

 Pityophthorus pubipennis Lee. 



Occurs abundantly in Ash {Fraxinus oregona) and Oak 

 (Quercus gerryana) in the western valleys. 



