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MONTHY LETTER OF THE BUREAU OF ENTOMOLOGY 
UNITED STATES DEPARTMENT OF AGRICULTURE 

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Number 198 October, 1930 

WIEC3 1930 ~ 
A. C. Baker, in Charge 
i T. §. Denertaaat ef Aeriou!tie 
Messrs. Tai Hee Hong and Kam Hu Lau were given appointments as 
agents with the Plant Quarantine and Control Administration--effectixe._J 
October 8, for duty at Honolulu, where they will be engaged in research 
work on the Mediterranean fruit fly under the direction of this divi- 
sion. 
The temporary appointment of J. R. Gross as Field Assistant in 
studies of bulb insects at Babylon, L. I., New York, was terminated Oc— 
tober 2, and he has returned to Ohio State University to resume his col-— 
legiate work. 
Dr. W. J. Hall, Entomologist with the British South Africa Citrus 
Estate, at Mazoe, S. Rhodesia, made a brief visit at the division head- 
quarters October 3, prior to a trip he was about to make across the 
United States. He intends to visit the more important citrus districts 
in order to acquaint himself with various entomological problems in the 
United States. 
C. P. Clausen, previously mentioned as having been in the Malay 
Peninsula and Dutch East Indies since the spring of 1929 collecting par-— 
asites of the citrus black fly, and as arriving in the United States on 
September 17, spent the interval from September 20 to October 19 in New 
York City rearing these parasites from material which he brought with 
him, and shipping them to Cuba. As an incident of this work he made one 
personal trip to Cuba, taking with him some of the more important para-— 
Sites. He returned to Washington October 19, to complete some manu— 
scripts dealing with earlier work on parasites in the Orient. Reports 
from Cuba indicate encouraging progress in the development of the natur-— 
al enemies of the citrus black fly which were imported by Mr. Clausen. 
One, Eretmocerus Serius Silv., which became established through a ship-— 
ment sent by him last March, has increased rapidly in numbers at all 
points of liberation. Very heavy parasitization by this species has 
been obServed in the Malayan region, its native habitat. A coccinellid, 
a species of Cryptognatha, is now being reared for distribution; it is 
predacious upon the eggs and early stages of the larvae of the citrus 
black fly. In shipping these parasites from the Orient a modified type 
of Wardian case has been used to permit of continuous breeding of both 
host and parasites, and while in transit they were carried on the open 
deck. As a result, the material remained in excellent condition during 
the six weeks in transit. 
