4()2 MISS W. U. SAINDKRS OX THK 



Maggot. — The larval stage lasted from 10 to 16 days in most 

 cases, but no moults were discovered, 



Puparium. — The resting-stage covered from 8 to 13 days in 

 the Bluebottle, but the Greenbottle spent up to 24 days in that 

 condition. 



Some eggs and maggots perished in a tem.perature of 38° C. 

 The last batches remained in the maggot stage for many weeks, 

 and they all succumbed at the beginning of November. 



The House-Fly {Musca domestica). 



Eggs were laid on banana, either in cracks or crevices of the 

 pulp or under the loose skin. 



As batches of eggs were found they were isolated in small 

 dishes. They were laid in material kept in a room where flies 

 were bred. The maggots fed on banana and a mixture of bi'ead, 

 casein, and sugar moistened with water. Changes in growth 

 were observed, but, as in the Blow-fly, no lai-val moults could be 

 seen. The method of egg-laying and of hatching is similar to 

 that of the Blow-fly. 



Some batches of eggs were divided, one half being kept at the 

 normal temperature of the room (40-60^ F.) and the other at 

 38° C. (100°-4 F.). The results were as follows:^ 



Temperature 100°-4 F. Temperature 40-60° F. 



Patch 1. Eggs laid September lst-2nd. 



Hatched Sept. 2nd-3rd. Hatched Sept. 2nd-3rd. 



Pupated „ 7th-10th. Pupated ,, 15th. 



Emerged „ 12th-16th. Emerged „ 26th-27th. 

 Total 14 days. Total 25 days. 



Patch 2. Eggs laid September 3rd-4th. 



Hatched Sept. 5th. Hatched Sept. 5th. 



Pupated ,, 12th. Pupated ,, 16th. 



Emerged „ 15th-16th. Emerged „ 28th. 

 Total 11 days. Total 23 days. 



Patch 3. Eggs laid September 5th. 



Hatched Sept. 6th. Hatched Sept. 6th. 



Pupated „ 13th. Pupated ,, 22nd. 



Emerged „ 15th-16th. Emerged „ 28th-29th. 

 Total 10 days. Total 23 days. 



Patch 4. Eggs laid September 6th-7th. 



Hatched Sept. 7th. Hatched Sept. 7th. 



Pupated ,, 14th- 15th. Pupated ,, 23rd. 



Emerged ,, 16th. Emerged ,, 30th. 

 Total 9 days. Total 23 days. 



