76 Universitij of California Publications in Zoology. [Vol. 7 



Empidonax difficilis Baird. Western Flycatcher. 



Generally distributed and fairly common, as birds go in this 

 region, but during the breeding season at least, very retiring 

 and hard to find. The sharp, two-syllabled whistle was frequently 

 heard, but the author of it was seldom seen. First noted on 

 Coronation Island, on May 15, and subsequently observed, evi- 

 dently migrating, on Warren Island, Heceta Island, and at San 

 Alberto Bay and Klawak, Prince of Wales Island. On the west 

 coast of Dall Island, the first week in June, they appeared to be 

 in pairs, and were seen pursuing one another through the tree 

 tops. On Duke Island they were fairly abundant, judging from 

 the frequency with which the call-note was heard. At Boca 

 de Quadra the species was uncommon, but on the Chickamin 

 River a number were seen, and an incubating female secured on 

 June 26. Small numbers were seen at Portage Cove, Revilla- 

 gigedo Island, at Etolin Island, and Bradfield Canal. At 

 Zarembo Island the species was far more abundant than at any 

 other place visited, this being partly due, perhaps, to the fact 

 that at this time the young birds had left the nests and were 

 beginning to appear in the woods. At Mitkof Island several 

 were seen, as also at Thomas Bay. At this time they were 

 evidently rapidly moving southward. Very few were observed 

 at Port Snettisham, the last being seen on August 29. The species 

 was not seen at all on the Taku River. 



Fourteen specimens w^ere collected, from the following 

 localities: Dall Island, one (No. OTli) , Duke Island, one (no. 

 9715), Chickamin River, two (nos. 9716, 9717), Revillagigedo 

 Island, one (no. 9718) , Etolin Island, one (no. 9719), Bradfield 

 Canal, one (no. 9720), Zarembo Island, five adults (nos. 9721, 

 9722, 9725, 9727), and two juvenals (nos. 9723, 9721). These 

 birds as far as I can see are absolutely indistinguishable from 

 specimens taken in southern California and Arizona. 



Empidonax trailli alnorum Brewster. Alder Flycatcher. 



A single bird, an adult male, secured on the Chickamin River, 

 June 21. At least one other, possibly the mate of the bird shot, 

 was seen on various occasions up to June 28, but it was too wary 



