OLD CROW 219 



A specimen which I obtained from Bettles on July 1, 1951, estab- 

 lishes the occurrence of H. u. incana there in a habitat typical for 

 this thrush. Keports from Eskimos at Kobuk described the nesting 

 and singing of another thrush very much like the gray-cheeked in 

 appearance, but differing in song and nest, and in the typical habitat. 

 The range attributed to incana (A.O.U., Check-list, 1957) should be 

 extended from northern Yukon across arctic forested Alaska to Bet- 

 tles, and I suspect to Kobuk, near the western extremity of the forest. 



The Indian name for this thrush is Tzi chi tlio. 



Hylocichla minima minima (Lafresnaye) 



Males Females 



Weight Fat Testes Weight Fat Eggs 



DaU (ff.) to.) 



May 31 28. 6 VLF 8x12.5, 10x13 



June 1 28. 1 LF 3 mm, 



Jime3 31.7 NF 6x10,6x10 



June 5 29. 3 LF 2 mm. 



June 7 31. 7 LF 6x11, 7x10 



JtmelO 30.4 LF 7x13,9x13 



June 12 30.4 LF 9x12,8x12 32.5 LP 4 broken follicles, 



brood patch 



June 13 30. 6 LF 7.6x12, 8x11 34. 3 LF 10 mm. 



June 20 30.7 LF 8.5x10.5,9x10 

 June 22 26. 8 LF 2. 5 mm. 



Francis Williamson reported first hearing a gray-cheeked thrush 

 on May 22. On May 23 I saw a gray-cheeked thrush as it dashed 

 from the willows in the swift pursuit of another, an action charac- 

 teristic of male thrushes when attacking invaders of their territory. 

 After that date thrushes were frequently heard and occasionally seen 

 in the thick willow brush back of the village. 



The testes of the first male specimen taken were as large as any 

 found later. Date of laying can be set by the condition of the female 

 specimen taken June 12, which indicated laying prior to June 9. This 

 female and the one taken June 13, which contained an egg 10 mm. 

 long, were above usual weight, a condition frequently remarked dur- 

 ing laying. 



The first date of laying by gray-cheeked thrushes was later than 

 was observed among the three other species of thrushes which were 

 common near Old Crow. It was remarked at Anaktuvuk that gray- 

 cheeked thrushes were not found nesting early, and at Kobuk Grin- 

 nell (1900) recorded their first arrival on the rather late date of 

 May 24. 



The specimens from Old Crow and Anaktuvuk were typical of 

 the nominate race which extends from arctic northwestern Alaska 

 through southwestern Alaska and northeastern British Columbia. 

 In migration they use the Mississippi flyway to Central and South 



