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fly, and pests of poultry, including lice, mites and fleas; also on the control 
about slaughter and packing-houses. | 
emporary field laboratories are established in regions where losses are most 
. One of these substations is located at Uvalde, in the semiarid region of 
, Mr. D. C. Parman, who is located here, devotes the major part of his time 
westigations of the so-called screw worm, and to certain species of Tabanidae 
th are very abundant and also concerned in the transmission of anthrax. Mr. 
D. Mitchell, with headquarters at Victoria, Texas, devotes a portion of his time 
work On insects affecting live stock. Mr. W. H. Dove, during the past season, 
nducted investigations on the horse bots, particularly Gastrophilus haemorrhoida- 
at Aberdeen, South Dakota. Arrangements have been made for the study of 
banidac, which are important pests of live stock in parts of Nevada and California, 
‘cooperation with the experiment station of Nevada. It is possible also that 
her work with horseflies will be taken up in the swampy area in southeastern Texas 
id southern Louisiana during the coming year. It is hoped that various agents of 
ye Bureau will assist as far as possible in this work by making notes on insects 
fecting animals when such occurrences come to their notice in connection with 
feir other work. Specimens of various animal pests will also be gratefully re- 
gived at the Dallas laboratory. | 
_ A. H. Jennings returned to duty on March 1. 
ee E. Holloway, in charge of the laboratory at New Orleans, was in Washington 
uring the month. 
Ds C. Bishopp, in charge of the laboratory at Dallas, Texas,’ underwent a seri- 
Ws Operation at that place during the month. His condition is greatly improved. 
TROPICAL AND SUBTROPICAL INSECT INVESTIGATIONS. 
CG. L. Marlatt, In Charge. 
| Dr. &. A. Back has substantially completed his work in Honolulu and will 
hortiy report to Washington to complete the general bulletin on the Mediterranean 
uit fly. Mr. C. HE. Pemberton will remain in Honolulu in charge of the work, as- 
fisted by Mr. Willard, who is in direct charge of the inspection and certification 
f export fruits in cooperation with the Federal Horticultural Board of this Depart- 
ant. The future development of the research work in the Hawaiian Islands in rela- 
ion to the fruit fly will be determined after Dr. Back returns to Washington. 
4 Dr. Back has recently submitted to the home office a very interesting book of 
hotographs illustrating the fruit-fly work and conditions in Hawail. In this book 
@ photographs of drawings of four of the introduced parasites. Opius humilis is 
he one which has hitherto been reported as being so efficient in its parasitism of 
Bs a6, particularly on coffee plantations. Among the parasites figured, however, 
S a species, Diachasma fullawayi, more recently established, which, within a single 
gar, has so increased that in one collection of coffee berries ninety-two per cent 
f the larvae were found parasitized. Further details relative to these and other 
parasites are given in papers already published by Dr. Back. 
The cotton fumigating plants reported in 4 previous number of this letter are 
ing investigated this week by Mr. Sasscer. They are having their preliminary 
ractical tests, and it is expected that within a few days the fumigation of all 
mported cotton will be undertaken. Mr. Maskew wires from San Francisco that the 
lant being erected at Oakland will also be ready for operation about the first of 
sehen 
arch. The supervision of this fumigation of cotton will probably require the 
