= t3 i 
L. G. Baumhofer, Assistant Entomologist, who for the past three 
years has been assigned to the study of the injury to the pine plantations 
at Halsey, Nebr., by pine tip moths, arrived at the Coeur d'Alene, Idaho, 
laboratory on April 30. Mr. Baumhofer assisted by F. B. Foley and L. J. 
Farmer, temporary employees, will spend a few weeks on the bark—-beetle 
control projects of Region 4, where he will make detailed examinations 
of the actual results secured from the burning-standing method of control. 
This method consists in spraying an inflammable oil upon the boles of the 
trees, and then burning them. It is only applicable for the treatment of 
lodgepole pine trees infested by the mountain pine beetle. Mr. Baumhofer 
expects to return to Halsey about June 16. 
C. W. Collins, in charge of the gipsy moth laboratory, spoke be— 
fore the Boston Federal Business Association on May 5. His talk dealt 
with the work carried on by the laboratory and was illustrated with lan— 
tern slides. Mr. Collins spent May 11 and 12 in Washington, consulting 
with Dr. F. C. Craighead concerning the activities of the laboratory. 
Dr. J. R. Hobbs, of the Harvard University Medical School, was given 
a temporary appointment as Field Assistant at the gipsy moth laboratory on 
May 16. Dr. Hobbs will continue investigations on the wilt disease and 
bacterial diseases of the gipsy moth which he has conducted during the 
past two summers under temporary appointments. 
The following men were given appointments as Field Assistants at 
the gipsy moth laboratory during the month: W. N. Sullivan, jr., a grad- 
uate of the Massachusetts Agricultural College; C. J. Poliks, a graduate 
of the Connecticut Agricultural College; and D. W. Farquhar, a graduate 
student at Harvard University. 
Prof. J. A. Manter, of the Connecticut Agricultural College, with 
six of his entomological students, visited the gipsy moth laboratory on 
May 13. Other visitors during the month were: Prof. W. E. Hoffmann and 
H. T. Chen, of Lingnan University, Canton, China; A. M. Vance, of the Ar-— 
lington, Mass., European corn borer laboratory; and R. A. Sheals and H. J. 
Conkle, of the Plant Quarantine and Control Administration, Washington, 
Dee C. 
Under the direction of C. E. Hood, of the gipsy moth laboratory, 
experiments for the control of Heterocampa guttivitta Walker were begun in 
May in western Massachusetts. Serious outbreaks of this lepidopterous 
pest have occurred in New England at ll-year intervals in areas where 
sugar maple and beech predominate, and the species began to be noticeably 
abundant again in 1930. 
A small colony of a eulophid, which is apparently a species of 
Chrysocharis, was liberated in Strong. Me.. on May 27. This hymenopterous 
parasite issued from material of Phyllotoma nemorata Fall. received at the 
gipsy-moth laboratory from Austria last winter. Phyllotoma nemorata is a 
leaf-mining sawfly on birch. It appeared in epidemic form in Maine in 
1927 and has since been noted in New Hampshire, Vermont, and Massachusetts. 
