1.2 



logical classes. Among the additional facts obtained on this excursion 

 was the discovery that the Dendroctonus enemy of the yellow pine 

 attacks trees defoliated by the pine butterfly (JVeophasia menapia), 

 and that it is quite intimately associated with the destruction of a 

 large amount of timber only partly defoliated by the butterfly larva. 

 Owing to the earliness of the season, no observations could be made on 

 this insect which has been in previous years so enormously abundant 

 and destructive in eastern Washington and in Idaho and Montana. 

 Indeed, it was hardly necessary that I should do so, since the subject 

 has received considerable attention at the hands of Professor Aldrich. 

 Further information, however, on the relations of Scolytids to the 

 subsequent death of trees only partly defoliated by it is a subject of 

 considerable importance which I believe has not previously been taken 

 into consideration. 



Leaving Moscow on the 7th of June and going via Pendleton, Oreg., 

 and Shoshone, Idaho, I arrived at Hailey, Idaho, June 9, where some 

 successful collecting was made from red fir logs at a sawmill, and 

 some valuable information was obtained from Messrs. Watt and 

 Peacock regarding the forest conditions and timber interests of that 

 section of Idaho. Learning of nothing else of especial importance 

 requiring my attention, I started on my return journey to Washington, 

 D. C, where I arrived on the morning of June 17, 1899. 

 1 The total distance traveled from Washington, D. C, and return by 

 rail, boat, wagon, and on foot was about 9,000 miles; the time occu- 

 pied, sixty-six days; the number of localities visited, twenty-six. 

 The number of specimens collected is as follows: 



Scolytidse, mounted (counted) 1, 074 



Scolytidae, in alcohol (counted) 2, 003 



Miscellaneous, principally Coleoptera, in alcohol (counted) 286 



Miscellaneous, mounted and in alcohol (estimated) 350 



Specimens of work of insects (counted) 650 



Total 4, 363 



Separate notes in notebook 760 



While the number of specimens is not as large as might have been 

 secured by general collecting, the. manner in which nearly all were 

 collected from their host plants, and the large series of notes on their 

 habits, makes them all the more valuable. 



SUMMARY OF WORK AND RESULTS. 



The above outline of the trip will indicate the character and amount 

 of work done and the success attained in efforts to carry out instruc- 

 tions. 



The distance traveled, the number of localities visited, and the lim- 

 ited time occupied in the trip from Washington and return left but 



