164 



KEY AND DESCRIPTION 



11. Western Wood Pewee (462. Contdpus ricJiardsdnii). — 

 This is a bird similar to tlie last, but darker and less olive- 

 tinted on the back, with more of olive-gray across the breast, 

 and less of yellovrish on the belly. 



Length, 6' ; wing, .S| (3|-3|) ; tail, 2^ ; tarsus, I ; culmen, i. Western 

 United States from the Plains to the Pacific, north to British Columbia, 

 and south in winter to northern South America. 



12. Yellow-bellied Flycatcher (463. Empidbnax flavivintris). 

 — A small, dark olive-green-backed, yellow-bellied flycatcher, 



with the yellow breast, sides, and 

 throat washed with much olive-green. 

 The wings and tail are blackish, and 

 the two wing bars whitish. This has 

 more sulphur-yellow on the lower 

 parts than any other of our fly- 

 catchers. No other eastern species 

 has yellow of any shade on the 

 throat. It is practically only a mi- 

 grant in the United States, and dur- 

 ing migrations is almost voiceless. 

 In its summer home in the northern 

 evergreen forests its rather plain- 

 tive call as well as its harsh, abrupt 

 "pse-ek" can be heard. 



Yellow-tellied Flycatcher 



Length, 5| ; wing, 2| (2|-2|) ; tail, 2^ ; 



tarsus, I ; culmen, J. North America from the Plains eastward; breed- 

 ing from the northern border of the United States to Labrador, and 

 wintering from eastern Mexico to the Isthmus. The Western Flycatcher 

 (464. Empidbnax diffinlin) of the western United States from the Plains 

 to the Pacific is very much like the last, but less yellow below, and with 

 buffy wing bars. The tail averages 2 1. 



13. Green-crested Flycatcher (465. Empidbnax viriscens).- — A 

 slightly crested, dull-greenish-olive flycatcher, with the lower 

 parts yellowish-white, and the distinct wing bars also yellowish- 

 white. The breast has a slight tinge of green, the throat is 

 white, and the wings and tail are blackish. The upper mandible 



