344 WEST VIRGINIA EXPERIMENT STATION. 



where I had seen, from the car window, several patches of dy- 

 ing trees. The first one of these groups 1 examined consisted of 

 only a few trees. The prime cause of their death was found to 

 be due to injuries of stones rolling against them from a stone 

 quarry. Another group was dying from injuries caused by the 

 destructive bark beetle in 1892, and by the numerous species of 

 bark beetles that had subsequently attacked them. The 

 large group which had induced me to visit this section was 

 found to be dying from injuries by fire. 



The dying trees at the stone quarry and those that had been 

 injured by the destructive bark beetle were remarkably rich 

 in specimens of bark beetles 1 although no living specimens of 

 the destructive species were found. The trees injured by fire 

 contained very few examples of insect except the large bark 

 and wood boring grubs. 



CONDITIONS IN GREENBRIER COUNTY. 

 SCRUB PINE. 



I went from Charleston to Ronceverte, in Greenbrier county , 

 where I arrived on April 30th. Having several hours at my 

 disposal here, before I could go on to the white pine forests in 

 Pocahontas county, I visited a grove of scrub pines nearby, 

 where I had noticed several trees dying. 



Upon examining the dead and dying trees, I found the same 

 conditions as in other sections. The trees had been killed by 

 Dendroctonus frontalis* but the insects were dead. Other 

 species of bark beetle occurred here in great numbers, especially 

 Dendroctonus terebrans^ which was literally swarming around 

 the base of the living trees and entering the bark. Adults of the 

 Glerid ( Thanasimus dubius) was also common, and were ob- 

 served to attack and kill the large bark beetle (D. terebrans), 

 which, in consideration of the nearly equal size of the two in- 

 sects and the strength of the bark beetle, was a remarkable 



1 The following Scolytids and their enemies were collected principally in the injured 

 trees at the stone quarry 

 Scolytids, Onathotrichus materiarius, Fitch. Pityqvhthorus pullus, Zimm. Pit 



thorns conftnis. Lee. Pityophthorus lautus, Fitch, Tomicus cacographus, Lee. Tomi- 

 cus avulsus, Eich. Tomicus plagiatus, Lee. Enemies, Aulonium tuberculatum, Lee. 

 Hist.er cylindricus, Payk. Nemosoma cylindricum, Lee. Chalcophora virginiensis, 

 Drury. 



