536 Field Museum of Natural History — Zoology, Vol. IX. 



The Western Wood Pewee differs from M. virens in being darker 

 and less olivaceous above, and having the wings and tail averaging 

 longer. While generally recognized as distinct, the differences 

 between this and the preceding species are very slight. 



Wing, 3.20 to 3.50; tail, 2.55 to 2.95. 



This species, if it occurs at all, can only be considered as an acci- 

 dental straggler within our limits. It has apparently not been ob- 

 served in Iowa or Illinois, although it is known to occur in western 

 Nebraska and western Kansas. 



It is included by Kumlien and Hollister who state: "Several 

 typical western wood pewees have been taken at Lake Koshkonong. 

 One pair with nest and eggs were identified by Dr. Coues as unques- 

 tionably of this species. Not reported by other observers at any 

 point in the state and we can add nothing to the above bare facts.' 

 (Birds of Wisconsin, 1903, p. 82.) 



Genus EMPIDONAX Cabanis. 



212. Empidonax flaviventris Baird. 

 Yellow-bellied Flycatcher. 



Yellow-bellied Flycatcher. 



