42 PACIFIC COAST AVIFAUNA No. 10 



175. . - Nuttallornis borealis (Swainson) 



Olive-sidEd Flycatcher. 



Synonym — Co nt opus borealis. 



Status — Common in summer from the Transition zone upward, in the higher 

 mountains north of the Mogollon Plateau ; recorded as breeding on the San Fran- 

 cisco, White, and Mogollon mountains. During the migrations it is quite gen- 

 erally distributed. 



176. Myiochanes pertinax pallidiventris (Chapman). . .. 



Coues Flycatcher. 



Synonyms — Contopus pertinax; Contopus pertinax pallidiventris; Horizo- 

 pits pertinax pallidiventris. 



Status — Common summer visitant in the Transition zone of the mountains 

 of southeastern Arizona (Huachuca, Santa Rita, Santa Catalina and White 

 mountains, Mount Graham, etc.), extending northward, in diminishing numbers, 

 to the Mogollon Mountains, where it was found breeding at Raker's Butte 

 (Mearns, 1890a, p. 256); casually to Fort Whipple: 1 specimen, August 20, 

 1864 (Cones, 1866a, p. 60). 



177. Myiochanes richardsoni richardsoni (Swainson). 



Western Wood Pewee. 



Synonyms — Contopus richardsoni ; Contopus virens richardsoni ; Horizopus 

 richardsoni; Contopus velici. 



Status — Common in summer in Upper Sonoran and Transition throughout 

 the state. During the migrations it is generally distributed. 



178. Empidonax difficilis difficilis Baird. 



Western Flycatcher. 



Synonym — Empidonax flaviventris var. difficilis. 



Status — A fairly common summer visitant, mostly in Transition, occurring 

 in all the higher mountain ranges. .Abundant and of general distribution during 

 the migrations. 



179. Empidonax trailli trail) i (Audubon). 



Traill Flycatcher. 



Synonyms — Empidonax pusillus; Empidonax trailli var. pusillus. 



Status — Probably fairly common in summer along most of the wooded 

 streams in the lower valleys, though found actually breeding at but a few points : 

 Tucson, Fort Whipple, San Pedro River, Santa Cruz River. During the migra- 

 tions it is abundant and generally distributed. 



180. Empidonax hammondi (Xantus). 



PJammond Flycatcher. 

 Status — A migrant, abundant and generally distributed throughout the state. 

 It is not known to breed anvwhere in Arizona. 



