534 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



208. Sayornis saya (BONAP.). 

 SAY'S PHCEBE FLYCATCHER. 



Distr.: Western United States, from Dakota and Nebraska to the 

 Pacific, and from Arctic Alaska south to southern California and Mex- 

 ico; accidental in Illinois, Wisconsin, Iowa, and Massachusetts. 



Adult: Upper parts, grayish olive brown; the head, darker, the 

 feathers on the crown with dark centers; throat and breast, olive 

 gray, shading into cinnamon brown on the belly; wings, brownish 

 black, edged with whitish on the coverts and inner feathers; under 

 wing coverts, buffy white; tail, entirely black; bill, black. 



Length, about 7; wing, 3.75 to 4.30; bill, .55. 



An accidental straggler in Illinois and Wisconsin. Mr. E. W. 

 Nelson records two specimens in the Northwestern University at 

 Evanston from West Northfield, 111., (Birds N. E. Illinois, 1876, p. 

 112); and Dr. T. M. Brewer states (Baird, Brewer, and Ridgway, N. 

 A. Birds, Vol. II, 1874, p. 349): "This species has been observed as 

 far to the east as Racine, Wisconsin, where it was taken by Dr. P. 

 R. Hoy. This specimen was sent to Mr. Cassin and its identity fully 

 established." 



Genus NUTTALLORNIS Ridgw. 



209. Nuttallornis borealis (SWAINS.). 

 OLIVE-SIDED FLYCATCHER. 



Contopus borealis (Swains.), A. O. U. Check List, 1895, p. 185. 



Distr. : Distributed throughout North America, breeding from 

 the mountainous regions of the United States to British Columbia, 

 and accidental to Alaska and Greenland; in winter south to Central 

 and South America as far as Peru. 



Adult: Wing, longer than tail; upper parts, brownish olive; 

 throat and middle of belly, whitish, usually faintly tinged with yellow; 

 greater portion of breast and sides of body, brownish olive, the breast 

 faintly streaked; primaries, dark brown; the secondaries and tertials, 

 narrow, tipped or edged with whitish; tail, brownish black; upper 

 mandible, brownish black; under mandible, mostly dull yellowish; 

 a tuft of fluffy whitish feathers on the flanks, the last being a good 

 character by which this species may be distinguished. 



Length, about 7 ; wing, 3.85 to 4.30; tail, 3; bill .70. 



The Olive-sided Flycatcher occurs as a rather uncommon migrant 

 in Illinois and southern Wisconsin; and a casual summer resident in 

 northern Wisconsin, where it breeds in the coniferous forests. 



