158 



Psyche 



[October 



up the sides and into the loose mushn cover in order to find a dry 

 place to pupate. No doubt they escape from the garbage recep- 

 tacles in the same manner. Cracks or openings in the bottom of 

 receptacles afford an easy means of exit, and often when a garbage 

 barrel was moved many maggots were found on the ground under- 

 neath. The little garbage "houses" in which the cans are often 

 kept are excellent places for the larvae, the floor always containing 

 many cracks by means of which they may easily obtain access to 

 the dry ground underneath. In instances where the garbage 

 had not been collected for two or three weeks, an all too common 

 occurrence, many larvae had pupated in the dryer, fresher material 

 which had recently been thrown in. 



TABLE OF REARING S SHOWING NUMBER AND PROPORTION OF 

 EACH SPECIES COLLECTED. 



When one considers the great numbers of Muscids issuing from 

 the garbage every day during the warm summer months, the 

 presence of twenty-two percent of house flies means that this 

 place of breeding ranks among the first to be considered in a cam- 



A 



