OLD CROW 209 



At Fort Yukon in 1958, Williamson and Peyton found E. traillii 

 on May 7, a week after tliey arrived there. 



The difference in date of arrival between Fort Yukon and Old 

 Crow suggests that migration does not proceed between those two 

 localities and suggests arrival of the migrants from the southeast. 

 Since they remain east of the Cascade and Coast Ranges in British 

 Columbia that is perhaps the western limit of their migratory course. 

 This flycatcher is known by the Indians as Sit tri gichi sseh. 



Nuttallornis borealis (Swainson) 



Imale May 24 weight 35.5 g. medium fat testes 4.5x12, 



4.5x9.5 mm. 



Francis Williamson recognized this olive-sided flycatcher by its 

 call on May 24. We followed the bird about among mixed birch, 

 poplar, and spruce at the top of the bluff for about an hour without 

 clearly sighting it, because it kept changing its calling position about 

 every five minutes as it moved around in an area about % i^il^ across. 

 Robert Bruce, who was hunting separately in the same area, finally 

 shot it from the top of a poplar. Judging from the size of the 

 testes it was near condition for breeding. 



This flycatcher nests in the forested areas of central arctic Alaska 

 (A.O.U., Check-list, 1957) and arctic Yukon, but has not been re- 

 ported in arctic Mackenzie. The more southern range from coast to 

 coast does not indicate a common migratory pathway for the species. 



The Indians know it as Tzivi. 



Family ALAUDIDAE: Larks 



Eremophila alpestris arcticola (Oberholser) 



Males Femalet 



V/eight Fat Testes Weight Fat Eggs 



Date ((?.) {mm.) (fl.) 



May 25 36.3 MF 5.5x9.5,6x7 



May 26 36.9 MF 5x8,5x6 



May 26 37. 5 VLF 5x8, 5x6, brood patch 37. 5 LF 4 broken foUicles, formed 



egg, brood patch 



Horned larks were first seen as they were singing on the southern- 

 most of the Old Crow Mountains on May 25. Estimating from the 

 condition of the female on May 26 the first egg had been laid about 

 May 22, and the larks must have arrived at least a week earlier, as 

 is their schedule at Anaktuvuk. 



Horned larks were seen only on the dry and barren rocky mountains 

 where a few pipits, wheatears, and rock ptarmigan somehow existed 

 in spite of the barrenness. Whenever the sun was warm many spiders 

 and some other insects could be seen, and these undoubtedly served 

 the small insectivorous birds. The occurrence of two medium-fat 



