352 WEST VIRGINIA EXPERIMENT STATION 



insect will have increased sufficiently to check them in their destructive 

 work. It is hoped, however, that the worst of the trouble is over." 



The same letter was addressed to owners of spruce timber, 

 except that the following reference to the spruce bark beetle 

 was added in the place of reference to the turpentine beetle: 



"One of the species which has been able to multiply in this way, is es- 

 pecially threatening to the spruce. It is the spruce bark beetle (Polygraph- 

 us rufipennis) which I found attacking living trees." 



FURTHER NOTES IN 1893. 

 WEBSTER, POCAHONTAS AND GREENBRIER COUNTIES. 



Spruce. On June 33d-27th, accompanied by Professors Al- 

 drich and Rane, of the University and Experiment Station, I 

 visited and made an extended tour through the spruce forests at 

 the sources of the Williams and Cranberry rivers, in the coun- 

 ties mentioned above, where it was found that no timber had 

 died recently, and the indications were that no further exten- 

 sion of the trouble would occur here, unless the spruce bark 

 beetle should make an attack later in the season. 



Monongalia County, Mayfield Hill Pine Grove. I visited 

 this grove on July 15th and found that the living trees that 

 were attacked by the destructive bark beetle in July, 1892, as 

 well as others attacked later in the same season, were yet living. 

 The turpentine bark beetle had attac'ked these trees in the 

 spring of 1893, as previously mentioned, and a brood had al- 

 most developed, yet the trees were living. In fact, none of the 

 living trees that were attacked by the turpentine beetle had 

 died, nor did they show any indications of doing so. Some of 

 the trees that had been seriously injured by the destructive 

 bark beetle during the fall of 1892, weie dying, and the bark 

 was infested with all stages of lomicus cacographus, of which 

 two broods had apparently developed, the second brood then 

 emerging. In a small scrub pine tree that was felled the pre- 

 vious fall, was found a single adult of the spruce bark beetle 

 (Polygraphus rufipennis), mining in the living bark but no 

 eggs had been deposited. This was the first and only instance 

 where I have observed this species in pine bark. 



While numerous Clerid larvae were observed in the bark in- 



