77 



51. The Ponderous Sawyer. 



J^rgiites ■•<pici(/.(ilt(>: Lee. 



An exceedingly large, round-headed, bark and wood boring grub, excavating large 

 and deep burrows in the saifwood and heartwood of dead and felled western yellow 

 pine; destructive to the W(jod of timber that has been dead or felled one or more 

 years. Southern Oregon. 



Exhibit: Adult and work. 



52. The Western Cedar Bark-Borer. 



Ifijlutriipe-'i atiiei}iys(iin(s Lee. 



A medium-sized l)ark and wood boring grub, excavating long, winding burrows in 

 the living bark ami surface of the wood and l)oring into the sapwood of injured, 

 dying, and recently felled giant arborvitie and incense cedar. Northern California 

 to Washington. 



Exhibit: Work. 



53. The Bronze Birch-Borer. 



Agrilus anxius Gory. 



A long, flat-headed, slender wood-boring grul), excavating long, winding burrows 

 in the bark and surface of the wood of living and injured birch, aspen, and cotton- 

 wood trees in northern Idaho, northern INIaine, and mountains of West Virginia; 

 also recorded from northern Michigan, New York, Pennsylvania, Virginia, Quebec, 

 and Ontario. A destructive enemy of the birches, aspen, and cottonwood. 



Exhibit: Adult and work. 



INJURY BY GALL INSECTS. ORDER HYMENOPTERA. 



J^A^iVr OW CJ^SK 15. 



54. Bird's-eye Pine. 



Chalcididf 



A common condition of the wood of the western yellow pine, evidently caused by 

 a minute four-winged gnat, fragments of which were found in pitch galls in the bark 

 of the main stem of young living pine. The formation of corky wood cells around 

 the accumulation of ]>itch in the wound produces in the subsequent layers of wood 

 the wavy and so-called bird's-eye effect in the wood of larger trees. Insects found in 

 specimen at Al))any, Oreg. Specimen of wood from Grants Pass, Oreg. 



Exhibit: Work. 



55. The Oak-Twig Orinyrus. 



Ormyrus sp. 



A minute four-winged gnat breeding in small gall-like cavities in the living bark 

 on the branches and twigs of the Pacific post oak in western Oregon, causing the 

 small and large oak trees to present a dying appearance, due to the great number of 

 dying twigs ami dead leaves. The healed-over wounds produce deformed branches 

 and defective wood. 



Exhibit: AVork. 



INJURY BY BARK AND WOOD-BORING GRUBS. ORDER COLEOP- 

 TERA, FAMILY BUPRESTIDiE. 



ca.?-;e i«j. 



56. The Western Hemlock Bark-Borer. 



Melanophila drummondl Kirby. 



A medium-sized, flat-headed, bark-boring grub, excavating shallow, winding bur- 

 rows through the inner layers of bark of living, injured, and recently felled western 

 hemlock and Douglas spruce; California to northern and eastern Washington and 

 western Idaho, and in the nol)le tir near Detroit, Oreg. A very common and 

 destructive enemy, killing the largest and best trees, or causing serious "gum spot" 

 defects in the wood of living ones. 



Exhibit: Adult and work. 



