218 U. S. NATIONAL MUSEUM BULLETIN 217 



Old Crow were unobserved. On June 1, 3, and 5 nests were found 

 containing eggs which would have been first laid about May 23, 27, 

 and 31, respectively. Within 100 yards of one of these nests were 

 three old nests among small spruce, a situation conforming to the 

 reported return of varied thrushes each year to a location close to 

 their previous nesting sites. The other nest found this year was about 

 a third of a mile distant. 



The weight of the two female varied thrushes was greater than that 

 of the males. Probably this represents the condition of overweight 

 which has been frequently observed among laying females of other 

 species. 



The range of this thrush to Kobuk and Old Crow indicates its 

 extension north of the arctic circle to near the edge of the forest 

 across Mackenzie, Yukon, and Alaska. Since it winters from southern 

 British Columbia to Baja California, it is a western migrant, prob- 

 ably passing through the mountain valleys. 



The Indian name is Sya. 





Hylocichla ustulata incana Godfrey 







Males 







Females 



Date 



Weight 

 07.) 



Fat 



Testes 

 (mm.) 



Weight 



(g.) 



Fat Eggs 



May 24 









31.6 



M 4 broken follicles, brood 

 patch 



May 29 



28.8 



VLF 



7x12, 7x12 







Junes 



29.4 



LF 



7x8.6, 6x9 







June 3 



28.9 



LF 



6x11, 6.6x10.5 







June 23 



26.0 



LF 



6x7, 7x8 







(aver.) 28. 2 



Francis Williamson heard a Swainson's thrush sing, and obtained 

 the female specimen listed above on May 24. From its condition 

 it must have begun laying about May 20, so that these thrushes must 

 have been about the earliest to arrive in the vicinity of Old Crow. 

 They were the most retiring of the thrushes, but they were by no 

 means scarce because they were heard frequently and seen rather 

 often although usually only briefly. 



Sidney Peyton found a nest on June 29 with three fresh eggs in 

 a slender spruce about 16 feet from the ground, in a thick growth 

 of spruce. The first egg in this nest was laid about June 26, 37 days 

 after the first female had begun laying. It does not seem possible 

 that such a late laying could have followed successful fledging of 

 an earlier brood. Before the date when this late clutch was started, 

 the gonads of one male had been found at less than full size, and 

 June 26 is an uncommonly late date of laying for this latitude. 



