W. E. Fleming, reporting on control investigations of the Japa— 
_ nese beetle at Moorestown, N. J., says: "The laboratory work with hydro- 
cyanic acid as a fumigant to destroy the adult Japanese beetles which 
— accidentally infest green bananas during the process of loading the cars 
more very satisfactory. Two cars were treated successfully in Phila- 
_ delphia in the early part of July without any apparent injury to the 
fruit. The chemical analysis of funigated bananas showed that there was 
little absorption of the gas by the fruit. On the basis of these results, 
_ recommendations were prepared for the treatment of bananas in this manner 
on a commercial basis. For some as yet unexplained reason, when this 
treatment was applied by inspectors of the Plant Quarantine and Control 
Administration, injury to fruit was reported on some of the cars. This 
phase of the matter is now being investigated." 

TROPICAL, SUBTROPICAL, AND ORNAMENTAL PLANT INSECTS 
W. BE. Stone, Mexico City, reports: "A device has been developed 
and practically perfected which will produce automatically in temperature 
chambers in this laboratory the varying temperatures as recorded by a 
thermograph at any locality where there is a possibility of the Mexican 
fruit fly becoming established. Extreme temperatures and the resultant 
effects can be shown, as they actually occur in the field. * * * It may 
be possible to modify the apparatus so that humidity can be controlled as 
well as temperature." 
Survival studies of Anastrepha serpentina Wied. at the Mexico 
City laboratory, which were formerly conducted by Mrs. H. H. Darby, have 
been continued by W. EB. Stone. One female and 4 males are still surviv~ 
ing of the population which has been under observation for 11 months. 
Adults of Anastrepha ludens Lowe, when fed on freshly cut mango, 
have shown normalsurvival, according to ¢. ©. Plummer, Cuervanaca, Morelos, 
Mex. This is contrary to the findings of M. McPhail, who in 1929 re- 
ported rapid death of this insect on similar mangoes and concluded that 
some toxic material was being formed. Occasional populations fed on cut 
ripe oranges die very rapidly, however, and Mr. Plummer says: "It is sus- 
/ pected that such mortality may be caused by a disease, for the dead flies 
in such instances emit a very disagreeable odor." 
A. C. Mason, Honolulu, T. H., is building up a stock of para- 
sites of the Mediterranean fruit fly for shipment to the Citrus Experiment 
Station, Riverside, Calif., where an attempt will be made by H. S. Smith 
to utilize them in control of the walnut husk fly. 
A study of the relative infestation of mangoes by the Mediter- 
ranean fruit fly and the mango seed weevil is being conducted at Honolula 
by M. McPhail, who reports: "Since both the mango weevil and the fruit 
fly may be found in the same mango fruit at the same time, the question 
has arisen as to whether or not there is some relation between the two 
insects. During the month of July an attempt was made to determine the 
relation between the two pests; 1,840 mangoes were examined. Weevil and 
Mm fly injury were recorded." So far, where weevil infestation is high, fly 
infestation has appeared to be low, and vice versa. 
