340 WEST VIRGINIA EXPERIMENT STATIOft 



while the adults of the larger species 1 were common in the liv- 

 ing bark at the base of the trees. Two species 2 were also very 

 common in the bark on the trunk of the trees. These were 

 accompanied by several species of predaceous beetles, one of 

 which 3 was very common in the galleries of Tomicus calli- 

 graphus and Dendroctonus terebrans. Clerid larvae were very 

 common in the outer and inner bark at the base of the trees, 

 probably the American species ( Thanasimus dubius}. The 

 destructive bark beetle (Dendroctonus frontalis) both in the 

 adult and larvae stage occurred in great numbers in the bark of 

 the same trees, but all that I observed on both dates were dead. 

 1 thought at the time that they had been killed by the severe 

 cold weather of the previous winter, but at the same time, it 

 seemed remarkable that this species should be killed when all 

 of the other species of bark beetles were living. 



CONDITIONS IN RALEIGH COUNTY. 

 WHITE PINE. 



While in Raleigh county distributing and colonizing the 

 imported Clerids between April 25th and 27th, some interest- 

 ing observations were made with reference to the condition of 

 the trouble and the habits of the different bark beetles. Soon 

 after entering the white pine forests of Beaver Creek on April 

 25th I examined a grove of white pine trees near Mr. J. R. 

 Beaty's saw mill, which were supposed by Mr. Beaty to be 

 perfectly healthy. I found that some of the finest trees, in fact 

 nearly all of them, were being attacked" by the large turpentine 

 bark beetle (Dentroctonus terebrans) which indicated that the 

 upper portion of the trunks had been attacked by D.frontalis. 

 Therefore, upon my expressing a desire to examine the tops of 

 some of the trees, Mr. .Beaty had a number of them felled, and 

 as expected, the most of them had been attacked by the de- 

 structive pine bark beetle during the previous fall. The bark 

 on the upper portion of the trunk had been mined, as usual, in 

 all directions by the beetle, eggs had been deposited, but none 

 of them had hatched and all of the adults were dead. All of 



1. Hylurgops pinifcx and Dendroctonus terebrans. 



2. Tomicus cacographus, T. calligraphus. 



3. Hypophloeus parallelue. 



