BIRDS OF NORTH AND MIDDLE AMERICA. 505 



partly concealing nostrils ; malar apex with distinct antrorse and semi- 

 erect setse. Wing very long and pointed, the longest primaries exceed- 

 ing distal secondaries by much more than one third the total length 

 of wing; ninth primary longest, eighth and tenth (outermost) a 

 little shorter and about equal. Tail about one-third as long as wing, 

 rather deeply emarginate, non-divaricate, the rectrices rather narrow. 

 Tarsus shorter than middle toe with claw, less than one-seventh as 

 long as wing, its scutellation essentially exaspidean but with outer 

 edge of acrotarsium not bending around posterior margin of tarsus, 

 there being a rather indistinct row of longitudinal scutella along upper 

 posterior portion of o\iter side of tarsus and a narrow space occupied 

 by small, irregularly hexagonal scutella along the posterior margin; 

 basal phalanx of middle toe united to outer toe for nearly its entire 

 length, to inner toe for about half its length; outer toe, without claw, 

 reaching to about middle of subterminal phalanx of middle toe, the 

 inner toe slightly shorter; hallux slightly shorter than inner toe, 

 slightly stouter, its claw shorter than the digit; all the claws rather 

 strongly curved, sharp, compressed. 



Coloration. — Above plain olive, darker on pileum, the wings dusky 

 with paler edgings ; beneath white or yellowish white medially, light 

 grayish olive, with darker shaft-streaks, laterally; on each side of 

 rump a conspicuous tuft of soft, silky, white feathers. 



Nidljication.— -'Nest on horizontal branch (usually of a coniferous 

 tree), shallow cup-shaped, composed of small twigs, grass stems, 

 bark strips, etc., lined with moss, soft grasses, etc. Eggs creamy 

 white or pale cream color, spotted round larger end with deep reddish 

 brown, lavender, etc. 



Range. — More northern portions of North America and coniferous 

 forests of higher mountain ranges southward to North Carolina and 

 Guatemala; in winter south to Peru. (j\lonotypic.) 



NUTTALLORNIS BOREALIS iSwainson). 

 OLIVE-SIDED FLYCATCHER. 



Adults {sexes alike). — Above plam slaty ohve or dark smoke gray, 

 the feathers (especially on pileum) more or less distinctly darker 

 centrally or mesially; tail dusky, the outer webs of rectrices edged 

 with grayish olive; wings sooty blackish, the middle coverts mar- 

 gined terminally with grayish olive, the greater coverts narrowly 

 edged with the same (passing mto whitish terminally), the secondaries 

 edged (except basally) with grayish white, more broadly on inner 

 secondaries (tertials); sides of head (including malar region) and 

 neck plain slaty olive, like upper parts; chest (except median line), 

 sides of breast, sides, and flanks brownish gray, more or less tinged 



