Calliphoridae 



421 



Fig. 78. — Cabinet for maintaining flies the year round. (Lower doors are open to show 

 content and construction.) By means of an electric fan (f) air is drawn through 

 cotton at the intake (i), over a heating unit (h) of electric light bulbs, and is blown 

 past moist wicks (w) and through cotton (c) into the middle chamber (m). From 

 here it passes through cotton covered holes in the floor of the fly chamber and out 

 through cotton protected slits on the top. r, water reservoir of the humidifying unit; 

 p, larval pans; he, humid chambers for hatching eggs. 



unused furnace has answered the purpose. No disagreeable odors are 

 formed in growing larvae on autoclaved food. The rearing may be done, 

 therefore, in the fly cabinet or out in the room. 



