1903] 



Keays Notes on the Size of Hawks' Eggs, 



20^ 



Leaving- out the three sets, 4061, 4224, 3780, supposed to be 

 from same bird, the average is 49|f cc. per eg-g, and 1665^2 per 

 set. 



Red-tailed Hawk. 



Set No. 



223 



292 



306 



361 



4227 



3864 



4226 



4058 



4220 



Total con- 

 tents 

 of Set. 



133 

 119 



62 



127 



137 

 120 



138 

 121 

 117 



Average 

 contents of 

 each Egg-. 



66 >^ 



59>^ 

 62 



63>^ 

 68>^ 



60 



69 



60 >^ 



58^ 



Largest egg, 69 cc. ; smallest, 57 cc. 



Largest set, 138 cc. ; smallest, 117CC. of two eggs, 62 cc. 

 of one egg. 



Largest average egg to set, 69 cc. ; smallest, 58^. 

 Average of 17 eggs measured, 93 i\. 



Broad-winged Hawk. 



In this list of eggs there are 4 series of eggs, taken from the 

 same woods in different years, all being first sets only, the birds 

 having been allowed to raise their second set in each case. 



No. 3784, 4 miles from London, were taken in 1901, and 

 average 45! cc. In 1902, from a new nest, about 50 yards 

 from that of 1901, the set 3883 was taken which average 46I cc. 



Both markings and size accord well, and the two sets were 

 doubtless laid by the same bird. 



