THE PINE INVESTIGATION. 337 



Washington, D. C,, where I examined a Norway spruce that 

 was infested in the usual way by the destructive bark beetles 

 and a number of its allies, I had no opportunity to observe 

 the conditions through Virginia and New Jersey, since I passed 

 through those States at night, but it was evident that if trees in 

 Washington city were affected that the trouble must extend 

 over the entire State of Virginia, Maryland, Southern Pennsyl- 

 vania and New Jersey, wherever the pine grew in any quantity. 



OBSERVATIONS AFTER RETURN FROM EUROPE. 



Upon my return to Morgantown, I visited the Mayfield Hill 

 Grove on Oct. 10th, for the purpose of making further observa- 

 tions and to liberate some of the imported Clerids. Here I 

 found that many more trees had been infested than when ob- 

 served on Aug. 10th, and that some of the trees that were 

 found to be attacked on July 24th were even yet 

 alive, and some of the trees which were not dead 

 as well as others that were commencing to die, contained all 

 stages of the destructive bark beetle from eggs to adults, some 

 of the recently matured adults having emerged. The Ameri- 

 can Clerid was found to be far more common, both in the lar- 

 vae and adult stage than on Aug. 10th, as were the parasite in- 

 sects that attack the larvae of the bark beetle. The dying 

 trees here, while of a different species of pine from these in 

 which che Clerids were found in Germany, and infested with 

 different species of bark beetles, were otherwise in practically 

 the same condition. Therefore, the opportunity for the im- 

 ported Clerid to make itself at home and begin operations at 

 once were most favorable, except, perhaps, that it was too late 

 for them to accomplish much in the way of breeding before 

 winter. 



On the 14th of October I visited the Tibbs Run forest and 

 found among the large pitch and yellow pines the same con- 

 ditions as on Mayfield Hill namely, that the destructive 

 bark beetle occurred in all stages in enormous numbers, and 

 that their natural enemies, both parasitic and predaceous, were 

 quite common. I found here, also, that in some of the dying 



