OLD CROW 



225 



Dendroica petechia amnicola Batchelder 



Males 



Females 



Bate 



May 27 

 May 28 

 May 31 



June 1 

 June 2 



June 6 



June 7 



Junes 

 June 10 

 June 12 



June 16 

 June 18 

 June 20 

 June 23 



Weight 

 (a.) 



10.2 



10.0 

 9.0 

 9.3 

 8.7 

 9.3 

 9.S 

 9.6 



10.3 

 9.4 

 9.6 



10.3 

 9.6 

 9.7 

 8.5 

 9.8 

 9.8 

 8.7 

 8.6 



8.1 



9.3 

 8.1 



Fat 



LF 

 VLF 

 LF 

 LF 

 LF 

 LP 

 LF 

 LF 

 LF 

 NF 

 LF 

 LF 

 LF 

 LF 

 LF 

 NF 

 LF 

 NF 

 NF 



NF 



LF 

 LF 



Testes 

 (mm.) 



4.5x7, Sx5.5 

 4.5x7, 4.75X 5 

 5x7, 5x5 

 4x7, 5x5 

 6x6, 5x5 

 4x5.5, 3.5x5 

 5x7, 5x5 

 4.5x8, 5x6 

 4x6, 4x5 

 5x7, 5x5 

 5x7, 5x5 

 5x8, 6x6 



, 5x6.6 



. 4x4.5 



6x8. 



7x8, 



6x7, 4.5x6 

 5x7, 6x6 

 6x7, 5.5x7 



2x3, 5x6 



4x5.6, 4x4 

 2x5, 5x6 



Weight Fat Eggs 



to.) 



10. 4 LF 6 mm. 



9. 6 LF 3 mm. 



9.8 MF 2 mm. 



9.6 



9.7 

 8.8 

 8.8 

 8.6 

 9.4 



10.5 



LF 2 mm. 



LF 1 mm. 

 VLF 2 mm. 

 LF 3 mm. 



LF 

 LF 



LF 



2 mm. 



2 mm. 



1 broken follicle 



1 egg forming 



3setsof5fFesbep:gs 

 1 set of 6 fresh eggs 

 LF 2 mm. 



1 set of 6 fresh eggs 



(aver.) 9.3 (Coefif. of var. 7.0%.) 9.6 



The first male yellow warbler was seen May 23 in the willows 

 above the overflow from the river. No others were noticed until 

 May 27, when they were occasionally seen in the willow-alder brush 

 on the flat behind the village. The numbers kept increasing until 

 about June 8, when they were the commonest birds in the vicinity, 

 for a pair might be seen every 50 feet along a trail for a distance of 

 several hundred feet. Apparently some pairs occupied a territory 

 with the center only 25 feet distant from the edge of a neighbor's 

 territory. In other willow-alder thickets along the river many yellow 

 warblers were seen. Farther up the Porcupine River the prevalent 

 spruce reduced the extent of their habitat. 



About June 8 their territories and mating appeared to be in settled 

 good order. On June 12 the testes of three male specimens either 

 had regressed or were still undeveloped, and a female specimen con- 

 tained a formed egg and a collapsed ovarian follicle. On June 16 

 three nests, each with five eggs, were found by Sidney and Leonard 

 Peyton, and on June 23 one with five fresh eggs was found. Yellow 

 warblers were the latest of the warblers to arrive and nest. The 

 first eggs in these nests were laid about June 10, 11, and 16 respec- 



