374 University of California Publications in Zoology. [Vol. 7 



Habits. — The western wood pewee was typically a bird of the 

 flat, though it was not numerqiis anywhere. The birds were seen 

 in varying situations, for example, on fences about the Quinn 

 River Ranch, and in willows along the river itself. Ordinarily 

 they were shy. 



On June 29 an individual was observed at the head of Big 

 Creek (8000 feet) proceeding gradually up the valley in which 

 our camp was located. It stopped to rest for a few moments 

 on almost every naked top twig of the quaking aspens. The 

 birds were more in evidence along a fence near the tree-lined 

 stream at Big Creek Ranch, than at any other locality visited. 



That there is a vertical migration among the western wood 

 pewees during the early summer seems quite probable. Such a 

 movement seems to exist in the black-headed grosbeaks, Wright 

 flycatchers, western lark sparrows, and white-crowned sparrows 

 in this region. Our data upon this point is so limited, however, 

 that no certain laws of movement may be formulated. 



Empidonax trailli trailli (Audubon) 

 Traill Flycatcher 



This flycatcher was one of the less common species, being 

 found at Big Creek Ranch only. 



The birds were noted only three times, being heard in a 

 thicket along the creek below the ranch. In this region the 

 stream flows rather slowly, and the vegetation surrounding it is 

 of the river-bottom type, which these birds so commonly frequent 

 in other parts of their range. 



One specimen only (no. 8560) was taken. 



Empidonax hammondi (Xantus) 

 Hammond Flycatcher 

 Our only record of the species is that of a specimen (no. 

 9251) taken in Virgin Valley on June 2. 



Empidonax wrighti Baird 

 Wright Flycatcher 

 Distribution. — Noted at Quinn River Crossing (4100 feet), 

 Big Creek Ranch (4350 feet), head of Big Creek (8000 feet), 



