106 PLANT QUARANTINE AND CONTROL ADMINISTRATION [April-June,. 
the mainland on the basis of refrigeration. These experiments are, however, of 
very distinct value in indicating that the immature stages of the Mediterranean 
fruit fly may be destroyed in considerable percentage at least by holding such- 
fruit for two or three weeks in storage at temperatures approaching freezing. 
True Fruit Flu Larva 
CS> posterior spiracle ^ Ceratitis Capita W, e J. 
posterior end 
l4-^Jl-x-1- l. a I — * — UL4) 
1 3 -feral view 
Other Larvae in Fruits 
(Z)Euxesfa no fata W/ed. 
-iosterforend 
lateral view 
posterior spiracle 
posterior end 
dorsal C3)/Jfher/gona exc/sa Tho m*. 
view ' 
lateral view 
& 
posterior end 
poslerior spiracle \ 
dorsal (4) Drosophih so. 
v/eyv iz. / 
lateral view 
%^S posterior spiracle 
(5) Calobafa lasciva F*b. 
poshrior end 
lateral view 
Oronnbt/ CTGrtmr, Cl /i/ZJ.) 
That refrigeration, even for a period of six weeks, at a temperature of about 
34° F. does not furnish a safe basis for shipment of infested fruit, would seem 
to have been very clearly demonstrated by later tests. There is, however, need of 
further investigation in this field, namely, the determination of whether the 
