326 THE CANADIAN ENTOMOLOGIST 



Gnathotrichns sp. 



A species similar to the last was taken from a healthy maple 

 {Acer macrophyllum) at Corvallis, Oregon, in May, 1916. 

 Hylaslinns ohscunis Mannh. 



The common clover root-borer is found in both Eastern and 

 Western Oregon. 

 Hylesinus aciileattis Say. 



Not abundant but is found attacking Fraxinus oregona in 

 the western valleys. The work of this beetle often presents a 

 masterpiece of wood engraving. The adult and laryal mines are 

 often as perfect and symmetrical as if done by the hand of an 

 expert engraver. 

 Hylesinus aspericollis Lee. 



A rather common species attacking living and dying alder 

 {Abuts oregona). It usually selects young trees, but in the late 

 summer of 1914 the author collected a number of adults from 

 newly made burrows on large limbs of old trees near Breitenbush 

 Hot Springs, Oregon. They worked in pairs, each helping in the 

 excavation. In August many of the burrows were just being 

 started. Noted at Florence and Corvallis, Oregon. 

 Hylesinus granulatus Lee. 



Collected from Abies grandis in Blue Mountains of Oregon, 

 in July, 1914. 

 Hylesinus dentatus Lee. 



Rare, found in Juniperus occidenlalis. 

 Hylesinus imperialis Lee. 



Rare, Corvallis, May and September. 

 Hylurgops rugipennis Mannh. 



Large numbers of these beetles were collected under the bark 

 of a large, dead white pine {Pinus monticola) in the Santiam National 

 Forest. August 21, 1914. 

 Hylurgops subcostidatus Mannh. 



A decidedly secondary pest, entering dying or dead Pinus 

 ponderosa after other Scolytids have started their work, occurring 

 in large numbers at times. They were found especially numerous 

 in the yellow pine of the Blue Mountain Region. 

 Hylurgops lecontei Swaine. 



A species similar to subcostulatus occurring in yellow and lodge- 



