CONTOPUS. 337 



rupted on breast), the lateral portions deep grayish brown, or brownish 

 gray, in strong contrast. (Subgenus Nuttallornis Eioaw. 1 ) 



Adult: Above brownish slate, some of the feathers usually with darker 

 shaft-streaks ; wings and tail dusky blackish, the wing-coverts tipped 

 with brownish gray and tertials edged with whitish ; a conspicuous tuft 

 of white cottony feathers on each side of rump (usually concealed by 

 wings) ; middle line of body beneath, from chin to crissum, white, the 

 lateral portions brownish gray (usually with darker shaft-streaks), this 

 sometimes extending across the chest, thus interrupting the white. 

 Young : Similar to adult, but tips to wing-coverts (narrowly) dull buffy 

 or fulvous. Length 7.10-7.90, wing 3.90-4.50, tail 2.80-3.50, exposed 

 culmen .58-.70, tarsus .55-.60. Eggs .82 X -61, creamy buff, spotted, 

 usually in more or less of a distinct ring round larger end, with deep 

 rusty brown or chestnut and purplish gray. Hob. Higher mountain 

 districts of United States, and coniferous forests of lowlands from 

 northern border (New England to Michigan, etc.) northward, and south 

 through higher mountains to Colombia. 



459. C. borealis (SWAINS.). Olive-sided Flycatcher. 



2 . Tarsus longer than middle toe, with claw ; primaries exceeding secondaries by 

 less than twice the length of the tarsus ; wing exceeding tail by less than 

 one-fourth the length of the latter ; first quill much shorter than fourth, 

 sometimes shorter than fifth ; no conspicuous white cottony tuft on side of 

 rump ; median lower parts not abruptly lighter than lateral portions. 

 (Subgenus Contopus CABANIS.) 

 b 1 . Wing more than 3.75. 



Above plain grayish brown, tinged with olive, the wings without very 

 distinct lighter markings ; beneath plain light olive grayish, the 

 chin whitish, the belly and under tail-coverts pale dull yellowish ; 

 length 7.70-8.00, wing 3.80-4.46, tail 3.60-3.90. Hob, Highlands of 

 Guatemala and Mexico, north to southern Arizona. 



460. C. pertinax CAB. Coues's Flycatcher. 

 b\ Wing less than 3.75. 



c 1 . Belly and under tail-coverts white or pale sulphur-yellowish; under 

 wing-coverts dull light olive-grayish, sometimes tinged with 

 yellowish. 



(P. Exposed culmen much less than twice the width of bill at nostrils. 

 e l . Second quill decidedly longer than third, and fourth quill much 

 longer than fifth ; wing 3.00, or more (usually more than 

 3.15). 



f l . Lores dull grayish, not distinctly or abruptly different 

 from color of forehead and ear-coverts; throat not 

 pure white. 



1 New subgenus; more properly a distinct genus, so numerous and positive are the differences from all the 

 species of Contopus proper. 



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