194 Annals Entomological Society of America [Vol. VII, 
After the second weighing, the first lot of one hundred eggs 
was put back into the pumpkin and the second batch was placed 
between moist filter paper. These lots hatched respectively 
in thirty and thirty-two hours after deposition. The hatching 
of the first batch of eggs was observed under a binocular micro- 
scope in order to remove the larve before they had an oppor- 
tunity to feed. The weight of the maggots and the difference 
in weight between the eggs and larve are recorded in the 
following table: 
TABLE IV. 
WEIGHT IN MILLIGRAMS OF RECENTLY HATCHED LARVA OF DACUS CUCURBIT#, AND 
DIFFERENCE IN WEIGHT BETWEEN EGGS AND LARV#. 



Difference in wt. between 
eggs and larve 

Wt. of 100 recently hatched larve 
3 hrs. after 27 hrs. after 


deposition deposition 
Hatched from first 100 eggs............ 4.2 3. 1.8 
Hatched from second 100 eggs......... 5.6 1.9 15 
IAWenage WibwOm IlArVicvesne sae eto .049 0245 .0115 


The two hundred, recently hatched maggots weighed one- 
third less than the eggs after deposition and about one-fifth less 
than the eggs before hatching. This loss can be attributed, 
in part, to the shedding of the chorion and vitelline membrane. 
The one hundred larve which hatched from the first batch 
of eggs were fed upon a hard, dry pumpkin while the other one 
hundred maggots were fed on a soft, juicy pumpkin. The 
following table shows the weights of the larve after they had 
fed a day. 
TABLE V. 
WEIGHTS IN MILLIGRAMS OF LARVA OF DACUS CUCURBITZ FED UPON A HARD, DRY 
PUMPKIN AND A SOFT, JUICY PUMPKIN. 


Fed on dry, Fed on soft, Difference 
hard pumpkin | juicy pumpkin in wt. 
Wt. of 100 larve 1 day old....... 26.6 63.6 37. 
Witotd tamavliday:olde ass . 266 .636 Of 

It is evident from this table that the larvze which fed on 
the soft, juicy pumpkin for one day weighed over twice as much 
as the maggots which fed on the dry, hard pumpkin. . Further- 
more, the former had increased their initial weight over eleven 
times and the latter over six times at the end of one day. 
