a a 
Mrs. H. H. Darby, of the laboratory at Mexico City, has completed 
Studies on the duration of adult life of the different species of Anas- 
life of a little over a month, may survive for more than a year. Mrs. 
Darby has also completed a study on Opius crawfordi, a parasite of the 
fruit fly, showing the difference in temperature response between the 
parasite and its host. The study shows the ranges in which the fly would 
Survive but the parasite would not. 
The new laboratory in Honolulu, Hawaii, constructed from special 
plans by the University of Hawaii and leased to the Government, is of 
hollow tile construction and is about 100 feet long by 40 feet wide. It 
is entirely surrounded by a moat for protection against ants. The lab- 
oratory contains an engine room, a refrigeration room, a constant-tem— 
perature room, a sterilization room, a control room for incubators, and 
laboratories for the various types of investigation. It is located on 
the University grounds near the new Pineapple Experiment Station, which 
is under the direction of Dr. R. N. Chapman. 
A. C. Mason, of the Honolulu laboratory, has specialized on parasite 
work. Large numbers of the parasites of the Mediterranean fruit fly were 
reared and these were brought to Washington by H. F. Willard, being fed 
during the trip on honey and water. Here they were taken by Senor Don 
Miguel Echegaray Romea of the Spanish Embassy, and after about a week's 
delay were forwarded to Spain under the same artificial conditions. Word 
has been received that the first Spanish generation of Opius' is emerging. 
T. H. Hong, of the Honolulu laboratory, has been studying the 
variation in morphology of the larvae of the fruit fly to determine whether 
races associated with hosts or climatic factors exist. Larvae possessing . 
the smallest number of spiracular lobes and those possessing the greatest 
number are being bred separately. 
O. C. McBride and Dr. Wm. Mitchell, of the Honolulu laboratory, 
have been studying the resistance of the peel of various varieties of 
fruit to determine whether resistance to attack by the female fruit fly 
is mechanical. A delicate piece of equipment has been devised to obtain 
the measurements. 
R. H. Marlowe, of the Honolulu laboratory, has been conducting a 
series of toxicity studies under accurate conditions to determine how 
much poison spray is consumed by flies of different ages in given pericds. 
Results show a difference in consumption between the copper salts and the 
arsenicals. The question as to how long flies must feed before obtaining 
a lethal dose is important. ; 
M. McPhail, of the Honolulu laboratory, has been studying the 
diurnal activity of the adult fruit flies and finds a decided variation 
associated with different periods during the day. He has also been check-— 
ing food sources of the fly. The Darbys, of the Mexico City laboratory, 
showed that the Mexican fruit fly survived for long periods on yeast, but 
preliminary studies indicate that the Mediterranean fruit fly may be able 
to utilize other materials. 
