370 



U. S. NATIONAL MUSEUM BULLETIN 217 



5 EMPTY FOULICUES. 



1 EGG 



L 



O' 





h 





F 





1 EMPTY FOLLICLE, 



1 EGG 





"-O 



1 







H 



F 



S EGGS 



L 





'O 



H 







' F 





S EGGS 





L 



'O 



H 







P 





6 EGOS 







L 



1 



o 





H 



F 



9 NESTLINGS 



L 



1 





H 





O ' 







3 NESTLINGS 



L 





1 



H 





o 



P 





e NESTLINGS 



L 





' 



H 





o 



P 





15 MAY 20 



25 



30 JUNE 4 



14 



19 



24 



29 



MM 

 10 . 





 O 



O 



o 

 o 



o° 



MAXIMVM.. 

 TESTIS 



O 



o 



o 

 o 



8 



o 

 o 



B . 



















F - 

 MF - 

 L F - 



oo 



o 



oooo 



o oo 



MEDIUM 







O 



o 



oo 



FAT 



VLP - 





o 















NF - 









o 









o 





G 



28 - 



29 - 



o 



o 



oO 



8° 



o o 

 o 



AVERAGE 

 WEIGHT 

 C- V- > 6 -5 % 





o 



o° 



o 

 o 



o 



o 



22 - 





o 















Figure 19. — Schedule and condition of Zonotrichia leucophrys gamhelii during the breeding 

 cycle at Old Crow. Schedule is estimated from the date of observation (marked by 

 large open circle), allowing 1 day interval between each egg laid from date of first (L) to 

 date of beginning of incubation (I), 12 days to hatching (H), and 9 days to fledging (F). 



