
aay 
adjacent to this forest. As a result of these examinations, it is now 
known that throughout the area examined a very large percentage of the 
Overwintering broods have been destroyed, and perhaps this can best be 
explained by the extremely low temperatures of the past winter. To the 
south of the Beaverhead, the mortality begins to decrsase and in the 
Wyoming National Forest, where control was conducted this spring, there 
was little evidence of abnormal mortality. This fact can be explained 
only by the absence of killing temperatures. It is expected that in 
all areas where this mortality occurred there will be a marked reduc— 
tion in this season's infestation. With this information at hand, plans 
are being made for the institution of surveys throughout the Yellowstone 
Park, and the Targhee, Teton, Wyoming, Cache, and Caribou National For-— 
ests, with the idea of determining the extent of this season's infesta-— 
tion for the purpose of instituting artificial control." 
Tree medication does not destroy parasite of mountain pine bee- 
tie.—-W. D. Bedard, Coeur d'Alene, reports that "Although larvae and ad- 
ults of the mountain pine beetle can be killed by injecting western white 
pine trees with a solution of sodium arsenate, this treatment does not 
destroy the parasite Coeloides dendroctoni Cush. This parasite is prac- 
tically restricted to the trees attacked by the beetle in June, because 
of the synchronization of the two seasonal histories. The Coeloides lar-— 
vae, therefore, have sufficient time to complete feeding by the time the 
trees are injected in late August and September. Examination of the June 
trees medicated in 1932 showed that these beneficial insects completed 
development and emerged." 
Habits of pine tip moth.--L. G. Baumhofer, Coeur d'Alene, states 
that "In a study of the habits of Rhyacionia neomexicana (Dyar) in the 
Nebraska National Forest it was found that most of the larvae, when ma-— 
ture in late June and early July, do not drop from the infested tips, 
but crawl down the bole of the tree to spin up at the base. This was 
determined by banding sapling pines with tanglefoot and placing tangle— 
foot screen under the crowns of other trees. Migration occurs during 
the night." 
Grasshoppers damage pines in Nebraska.--Mr. Baumhofer also says 
that "grasshoppers were again numerous enough in the Nebraska National 
Forest to cause serious damage to young pine plantations. The Forest 
service, as in the past 2 years, carried on control to protect the ex- 
tensive area of pines planted in early spring, treating a total of 
about 900 acres." 
Exorista mella Walk. failed to develop on gipsy moth.--R. T. Web- 
ber, Melrose Highlands, Mass., submits the following paragraph based 
on studies he made in July: "No elaborate host relation studies of Exo- 
rista mella and Porthetria dispar L. were possible because of the scarcity 
of BE. mella. There were, however, a limited number of P. dispar larvae 
(all in last instar) obtained from field collections infested with E. 
mella eggs. These larvae were isolated and the development of the 
parasite observed daily. Nearly all of the larvae pupated and gave 
