196 Annals Entomological Society of America  [Vol. VII, 
The second day a larva acquires 2.1 times the weight of the 
first day. 
The third day a larva acquires 6.9 times the weight of the 
second day. 
The fourth day a larva acquires .27 times the weight of the 
third day. 
In 41% days a larva lost .017 times the weight of the fourth 
day. 
The minimum increase in the daily weight of the larve over 
the previous day occurred during the fourth day and the maxi- 
mum increase took place during the first day. During the last 
twelve hours of the larval period, the maggots decreased in 
weight. In all probability, this loss may be attributed in part, 
to the evacuation of the contents of the alimentary canal pre- 
vious to pupation. 
After the fifty larve bored out of the pumpkin in 414 days 
they were allowed to pupate in moist sand. Twelve hours 
later the sand adhering to the newly-formed puparia was washed 
off and the moisture adhering to them was absorbed with filter 
paper. After the puparia were thoroughly dried they were 
weighed in a weighing bottle. Other melon fly maggots which 
bored out of pumpkins in 324 and 4 days were weighed, and 
twelve hours later the newly-formed puparia were weighed. 
The following table shows the average weights of the mature 
larve, the puparia twelve hours after the larve bored out of the 
pumpkins, and the loss in weight after pupation: 
TABLE VII. 
AVERAGE WEIGHTS IN MILLIGRAMS OF MATURE MELON FLY LARV4, WEIGHTS OF THE 
PUPARIA TWELVE HOURS AFTER THE LARV# BORED OUT OF THE PUMPKINS 
AND THE LOSS IN WEIGHT AFTER PUPATION. 




Age of Average wt. Average wt. Loss in wt. Loss in wt. 
larvee 1 larva 1 puparium after pupation % 
416 days..... 20.086 18.95 1.136 5.6 
A dayGirss: 22.509 20.336 2.173 9.6 
334 days..... 20.87 19.0534 1.8166 8.7 



The results show that twelve hours after the melon fly 
larve bored out of the pumpkin and transformed into puparia, 
there was a loss of 5.6 to 9.6% in weight. 
