Culicidae 



385 



the distance from the floor to the free edge of the shelf. The bottom 

 of this pit is covered by a layer of moist white sand. It was designed as 

 a dark, humid, quiet resting place for imagos. From the 1.5' fore-wall 

 that is below the edge of the shelf, to the east end of the cage is a 



MOSQUITO REARING CAGE 



w 



■ I N 



Plan 



L S t W West 



End Elevation 

 (from the East) 



Fig. 69. — Plan and end elevation (from the east) of mosquito rearing cage. 



wooden floor. Across the east end is a 44 gallon wooden tank, the 

 bottom of which is 3' above the floor. It has a free water surface of 

 6.4 square feet. Four feet directly above the vat is a water vaporizing 

 nozzle that is similar to those used on vegetable stands. It is kept 

 continuously in action. That fraction of the water jet which is not 

 beaten into a mist is conducted out of the cage and allowed to flow over 

 the walk of the greenhouse compartment. The element of the mist that 

 does not evaporate falls into the tank. The overflow from the vat passes 



