Percent 
(16.6 broods 
per sq. mile) 
(22.2 broods 
per sq. mile) 


(29.2 broods 
per sq. mile 
(25.8 broods 
per sq. mile) 

ad an oe | 
May 20 June 19 July 19 Aug. 18 Sept. 17 Oct. 17 Nov. 16 
Figure 18.--SPECIES COMBINED: FLIGHTLESS BROODS, EXPRESSED AS A 
PERCENTAGE OF ALL BROODS PRODUCED, 1950-53 
3h [See text for explanation of these graphs | 
