338 NORTH AMERICAN BIRDS. 



g 1 . Lighter and more olivaceous above, the median lower 

 parts more distinctly whitish, or less extensively- 

 interrupted with olive-grayish on breast; wings 

 and tail shorter; length 5.90-6.50, wing 3.00-3.45 

 (3.27), tail 2.50-2.90 (2.71), exposed culmen .43- 

 .52 (.48), width of bill at base .24-.30 (.28), tarsus 

 .48-53 (.51). Nest a very beautiful saucer-shaped 

 structure covered exteriorly with green and gray 

 lichens, built usually upon a thick horizontal 

 branch. Eggs .71 X -53, pale creamy buff or 

 creamy white, spotted, usually in ring round 

 larger end, with rich madder-brown and lilac-gray. 

 Sab. Eastern North America, north to Canada, 

 etc., west to edge of Great Plains; south, in winter, 

 to eastern Mexico and Guatemala. 



461. C. virens (Linn.). Wood Pewee. 

 g 2 . Darker and less olivaceous above, the median lower 

 parts less distinctly whitish, or more extensively 

 interrupted with olive-grayish across breast; wings 

 and tail longer; length 6.20-6.75, wing 3.15-3.55, 

 (3.34), tail 2.50-2.95 (2.74), exposed culmen .44- 

 .51 (.48), width of bill at base ,27-.32 (.29), tarsus 

 .49-.56 (.52). West composed chiefly of plant- 

 fibres (sometimes, though rarely, ornamented with 

 lichens), often built in forks of branches. Eggs 

 .69 X -54, colored like those of C. virens. Ilab. 

 "Western North America, east to Great Plains, 

 north to British Columbia and interior of British 

 America, south, in winter, through Mexico and 

 Central America to Costa Pica.. 462. C. richard- 

 sonii (Swains.). Western Wood Pewee. 

 f 1 . Lores whitish, in strong contrast with color of forehead 

 and ear-coverts ; throat pure white ; otherwise very 

 similar in color to C. virens, but bill much longer, 

 broader, and more flattened ; length (skin) 5.60, wing 

 3.20, tail 2.60, exposed culmen .55, width of bill at 

 base .35, tarsus .50. Sab. Yucatan. 



C. albicollis Lawk. White-throated Wood Pewee. 1 

 e 1 . Second quill not conspicuously (if any) longer than third, and 

 fourth not conspicuously longer than fifth ; wing not more 

 than 3.05 (usually less than 3.00). 



Above dull olive, decidedly darker on top of head, lighter 

 on rump ; wings and tail dusky, the former varied by 



1 Contopua albiaollia Lawk., Ann. Lye. N. Y. Ac. Soi. iii. No. 5, Jan. 5, 18S5, 156. 



