115 



Rainfall 

 in inches 



No. of - 

 Flies 



Max. Temp, 

 in shade °F 

 7-> 



56 



Min. Temp, 

 -on grass °F 

 .54 



Chart II. See Chart I for key to curves. 1920. 

 C = time of appearance of flies bred in grasses over the winter. 

 ^' — ^ ^°d C" — S = average intervals in days required for the production of first and second 



brood flies from parent flies at C. 

 ^ — J^ = average period in days required for the production of flies from the above first 



brood flies. 



8—2 



