THE T-oriST RORKR. 9 



(liiinii<,»'0 l>y the horor was vcrv sliylit in trees of all sizes. On Au<:;ust 

 20 iiuiuy adults and a very fi'w i)iii)a', hut no larva', were found in small 

 trees in th^ valley, while the lari^e trees in the same loeality were but 

 slijfhtly daniau'c'd. 



OBSERVATIONS BY MEMBERS OF THE FOREST SERVICE. 



The following- notes ))y Mr. S. N. Spring, forest assistant in the 

 Forest Service, were sul)nutted October, 11M)5, as a contribution to the 

 lesults of cooperative studies. Early in fTuly the work of the borer 

 was noticed in the central portion of Westmoreland County, Pa. The 

 first adult insect was seen on August 2J». Evidence of the work of this 

 insect was found in the localities investigated, but, for the most part, 

 it was not serious enough to prevent the planting of locust for fence 

 }X)sts. To the north and west of Greensburg, in Westmoreland County, 

 and in Alleghenv County many roadside trees were badly })ored. The 

 work of the borer is slight on Chestnut Ridge and Laurel Hill, where 

 locust thrives. Posts and pit props cut in these mountains show slight 

 injury only. In the few places where injury was found to l>e great, 

 within the area studied, the trees were dying, and many l)ranches were- 

 l)roken otf where the trees had been extensively t)ored by this insect. 

 Owing to the fact that places of serious injury were so few, it was 

 impossible to carry out any observations that would be of value in a 

 study of innnunity. In general the locust on the two liigh ridges 

 thrived better than those on the lower elevation of Westmoreland and 

 Fay«'tte counties, and less injury due to this inscM-t was found among 

 the trees on the ridges. 



Air. »]. W. Fetherolf, of the Forest Service, infornu'd tlie writer, on 

 Jaiuiary 28. 190,5. that a grove of black locust planted in Salt Lak(! 

 City, Utah, prior to lS."t(), is still in a thi'ifty condition and apparently 

 free from all in.sect injury. The same can be said about this species 

 seen elsewhere in the Salt Lake \'alley. 



Mr. Wesley Bradtield. of the Forest Sei\ ice, informed the writer 

 that he found the adult beetles conunon on budly damaged trees, '» to 

 S years old, near Marshall. Mich., in August, 1!<(>.'): also, that accord- 

 ing to his observation the locust in the southern ([uarter of Michigan 

 was seriously dan)aged, while in the noithein t hrec'-qiuirt^M's, especially 

 toward Lake ^lichigan, it wa^ not. 



RECENT OBSERVATIONS BY THE WRITER. 



On .March 11, l'.MK'>. it was found at .Vrlington Farm. \'iiginia. that 

 the young larva' had passed the winter in mitnite cells which tlcy had 

 excavated in the outer layers of the living l)ark and just beneath the 

 outer <'orky l»ark (tig. 5), as recoi'ded l»y l)earlioin. So common w»>re 

 these hit)ernatmg larva' in the trees that in the bark of .some of them 

 there were fifteen or twenty within an area of a few .square inches; 

 ()1830°— Bull, as— 10 2 



