20 



38. The Grand Fir Bark-Beetle {Hylesinus n. sp.). 



Excavates two separate, transverse galleries from a central entrance burrow in the 

 bark and surface of wood of recently felled grand fir. Port Angeles and Port Williams, 

 Wash. 



Exhibit: Work. 



39. The Shore Pine Hylesinus {Hylesinus sericeus Mann.). 



Excavates one short, longitudinal gallery from the entrance burrow and small side 

 cavity in living bark of injured, dying, and recently felled shore pine. Newport and 

 Seaside, Oreg. Common. Also recorded from California and Alaska. 



Exhibit: Adult and work. 



40. The Ash-Tree Bark-Beetle (Hylesinus aculeatus Say). 



Excavates two long, transverse galleries, from a central entrance burrow and side 

 cavity in the living bark of injured, dying, and recently felled ash. Atlantic to 

 Pacific coast. Common. Specimens from Oregon ash, St. Helen, Oreg. 



Exhibit: Adult and work. 



41. The White-Alder Bark-Beetle (Hylesinus aspericollis Lee). 



Excavates a moderately long, longitudinal gallery from a basal entrance burrow 

 in the bark of living, injured, dying, and recently felled white alder. Newport, 

 Detroit, and Astoria, Oreg., and Seattle, Wash.; also recorded from California. A 

 destructive enemy, causing the death of large trees. 



Exhibit: Adult and work. 



42. The Western Hemlock Bark-Beetle (Hylesinus n. sp. ). 



Excavates one or two transverse galleries from a central burrow in bark and sur- 

 face of wood of living, injured, and recently felled western hemlock, causing "gum 

 spot" defects in the wood of living trees, and may cause the death of the best tim- 

 ber. Newport, Oreg. , and Port Angeles, Wash. 



Exhibit: Adult and work. 



CASE 13. 



43. The Douglas Spruce Hylesinus (Hylesinus nebulosus Lee). 



Excavates two short, straight, longitudinal galleries from a central entrance bur- 

 row in the living bark of injured, dying, and recently felled Douglas spruce. Cali- 

 fornia to British Columbia, and eastward to Idaho and Colorado. Very common. 



Exhibit: Adult and work. 



44. The Single Spine Scolytus (Scolytus unispinosus Lee). 



Excavates two short, straight, longitudinal galleries from an entrance burrow in 

 living bark of injured, dying, and recently felled Douglas spruce and western larch. 

 Pacific coast, Cascade and Rocky Mountain region. Common. 



Exhibit: Adult and work. 



45. The Fir-Branch Scolytus (Scolytus n. sp.). 



Excavates two short, longitudinal galleries from a central burrow and side cavity 

 in living bark of the branches of recently felled grand fir. Cascade Mountains near 

 Grants Pass, Oregon. 



Exhibit: Work. 



46. The Smaller FiivTree Scolytus (Scolytus n. sp.). 



Excavates two transverse or oblique, slightly curved galleries from a central 

 entrance burrow and side cavity in the bark and surface of wood of injured and 

 dying grand fir. Kootenai, Idaho. 



Exhibit: Adult and work. 



