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— TROPICAL AND SUBTROPICAL INSECT INVESTIGATIONS 
a C., L. Marlatt, In Charge.’ 




















» R. Horton, who for the past six months has been studying the role of the 
sine ant in citrus groves in Southern California, has returned to Washington to 
6 his general studies of the Argentine ant in relation to citrus cultures for 
ion, 
"Dr. E. A. Back has during the summer completed his report on the Mediterranean 
ruit’ fly (Ceratitis capitata) investigations in Hawaii, and this report has been 
itted for publication. Dr. Back has left for Spain on a personal trip, to be 
four months, but in the meantime expects to be able to make some observations 
do some work which will be of advantage to the Federal Government in relation to 
fruit fly. 
: Mr. Pemberton, who is now in charge of the Fruit Fly Experiment Station in 
aii, reports some very interesting biological interrelations between the differ- 
imported parasites, bearing particularly on the preblem of the interference of 
e8e parasites with each other. He also reports some rather promising work with 
sprays against the molon fly (Bactrocera cucurbitae). 
; A. D. Borden is conducting a cooperative experiment, with the Maryland Agricul- 
sural Experiment Station, in the greenhouse control of the rose midge. 
TRUCK CHOP AND STORED PRODUCT INSECT INVESTIGATIONS 
¥. H. Chittenden, In Charge. 
NOTE ON FUMIGATION. 
cf 
a In a recent fumigation, October 14, 1916, of the insectary, main building, two 
ars containing 6 pounds of cyanid cf sodium were used for the top floor. The rooms 
tained a considerable accumulation of old beehives and useless material. Although 
building remained open 17 hours, from 6:00 P, M. of the 15th until 11:00 A. M, 
# the following day, a strong odor of hydrocyanic acid persisted in the room, evi- 
jéntly more or less held by the large amount of dead air space in and about the 
lives. The weather outside was extremely still, practically no breeze blowing, 
hich, no doubt, accounts for the lingering of the gas in such strength in the rocm 
A NEW GREENHOUSE, 
an new greenhouse is in + the course of construction. It is modeled after the 
ey. 
is one constructed for this branch of the Bureau in 1914, and is to be ats for 
gating different forms of insects on pagrus deubapes sa: Shee legeik Some, toma« 
STORED-PRODUCT INSECTS. 
During the autumn the usual number of complaints have been received of insects 
an weevil (Bruchus [Pachywerus] quadrimaculatus Fab. ) is usually present. 
he cowpea weevil (Bruchus [Pachymerus] ghinensis L.) which was very abundant 
Divas’ years is conspicuous by its absence. Living specimens of this species are 
ajurious 4o stored leguminous seed, In the case of dried cowpeas, the four-spotted | 
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