oe 
1914] Melon Fly, Dacus cucurbitae. 185 
9. Injury to string beans.—An examination was also made 
of the injury which the melon fly larve cause to the seeds and 
pods of green-podded string beans. It was found that the 
maggots feed upon the seeds and also the fleshy part of the pods 
(plate XXX, figs. 31 and 32). After these portions have been 
consumed the inner surfaces of the pods turn black (plate XXX, 
Hig, So). 
Dead Dacus larve were found within the seeds and pods 
of string beans. Sometimes the dried bodies of the maggots 
were found protruding from the pods (plate XXX, fig. 39); 
these evidently died in the process of boring out of the host. 
Pupation, which normally occurs in the ground, often takes 
place within the dried pods (plate XXX, figs. 36 and 37). 
V. Foop PLANTs. 
In the Hawaiian Islands the melon fly has been bred from 
the following food plants: 
VEGETABLES. FRUITS. 
Cucumber Mango. Bred by Terry (11, p. 32). 
Egg Plant ?Orange. Bred by Ehrhorn (4, p. 337), 
Kohlrabi Papaya. 
Muskmelon. 
Pumpkin. 
Squash. 
String bean. 
Tomato. , 
Watermelon. 
Wild cucurbit (Sycos sp.). Bred by Van Dine. (11, p. 32). 
In India, Froggatt (5, p. 18) bred Dacus cucurbite from 
melons, bitter gourds and egg plants. 
10. Number of melon flies bred from the food plants—To 
determine whether the pest could obtain sufficient food material 
from the corolla of pumpkin flowers to complete the larval 
development, the corolla was removed from six staminate 
flowers in the field and each corolla was then placed in a breeding 
jar together with recently, hatched, melon fly maggots. The 
larve during their development obtained no other food than 
that furnished by a single corolla. One male and one female 
melon fly succeeded in completing their life history on this 
food supply. 
An experiment was now performed to determine the number 
of melon flies which could be bred from an entire staminate 
flower including its long peduncle. A dozen, infested, stam- 
