THE LocrST HoRKK. W 



daiiia»fe ^»y tlio Itoifi- was very slii^lit in trees of all sizes. On Au«;ust 

 2<» many adults ami a very few piipte, l>ut no larva', were found in small 

 trees in the \ alley, while the large trees in the same locality wtTc hut 

 sliii'litly dama^r^'d. 



OBSERVATIONS BY MEMBERS OF THE FOREST SERVICE. 



The followini"" notes hy Mr. S. N. Spring-, forest assistant in the 

 Forest Serviee, were .sul)mitted October, llMio, as a contribution to the 

 results of cooperative studies. Earl}' in Juh* the work of the l)orer 

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

 first adult insect was seen on August '2\}. Evidence of the work of this 

 insect was found in the localities investigated, but, for the most pait. 

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

 posts. To the north and west of Greensburg, in Westmoreland County, 

 and in Allegheny County many roadside trees were badly bored. The 

 work of the borer is slight on Chestnut Ridge and Laurel Hill, whei-e 

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

 injury only. In the few places where injury was found to be great, 

 within the area studied, the trees were dying, and many branches were 

 broken otl' where the trees had been extensively bored by this insect. 

 Owing to the fact that places of serious injur}- were so few, it was 

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

 study of immunity. In general the locust on the two high ridges 

 thrived better than those on the lower elevation of Westmoreland and 

 Fayette counties, and less injury due to this insect was found among 

 the trees on the ridges. 



Mr. .1. W. Fetherolf, of the Forest Service, informed the writer, on 

 Jaiuiarv 'I^k 190,o. that a grove of black locust planted in Salt Lake 

 Cit}', Utah, prior to ls"t<», is still in a thrifty condition and api)arently 

 free from all insect injury. The same can l)e said about this sp(M'i(\s 

 seen elsewhere in the Salt Lake Valley. 



Mr. Wesley Hradtield. of the Forest Service, informed the writer 

 that he found the adult V)eetles common on l>adly damageil trees. .'» to 

 S years old, near Marshall, Mich., in August, IKO.^; also, that accord- 

 ing to his obst'rvation the locu>t in the southern (piarter of Michigan 

 was seriously damaged, while in the noithern thie(>-(iuarters, especially 

 toward Lake Michig-an. it wa^ not. 



RECENT OBSERVATIONS BY THE WRITER. 



On March 11. lHoO, it was found at Arlington Farm. \ irginia. that 

 the young larva' had passed the winter in minute cells which th"y ha<l 

 excavated in the outer layers of the living bark and ju^t beneath the 

 outer corky bark (tig. .5), as recorded by Hearborn. So connnon wei-e 

 these hibernatmg larva' in the trec^s that in th(> bark of s«)nie of them 

 there were tifteen or twenty within an area of a few sipiare inclie>; 



