VIREO. 473 



oHve-gveen and yellow; loni^lh 5.00-fl.OO, wing 

 2.90-3.00 (2.94)/tiiil 2.10-2.20 (2.19), bill from 

 nostril .28-.30 (.29), tarsua .70-.73 (.71). Nest in 

 ■woods, iu undergrowth or lower branches of small 

 trees. Eggs .79 X -57. Hub. Eastern North 

 America, north to Fort Simpson and Hudson's 

 Bay, breeding chiefly north of United States; 

 south, in winter, through eastern Mexico to 

 Guatemala. 

 629. V. solitarius (Wils.). Blue-headed Vireo. 

 g*. Back, etc., more grayish olive-green, less abriijitly 

 (if at all) contrasted with the duller ash-gray 

 of head and neck; gray of cheeks less abruptly 

 contrasted with white of throat; sides and flanks 

 less strongly tinged with olive-green and yellow. 

 (Young in first winter much browner than cor- 

 responding stage of V. solitarius.) Length 5.00- 

 5.60, wing 2.85-3.00 (2.90), tail 2.10-2.30 (2.16), 

 bill from nostril .28-.31 (.30), tarsus .70-.78 (.74). 

 Eggs .79 X -55. Hab. Western United States, 

 east to Eocky Mountains, but chiefly (if not ex- 

 clusively) Pacific coast in summer; in winter, 



south through western Mexico 629<7. V. soli- 



l*""') tarius cassinii (Xantus). Cassia's Vireo. 



p. Larger (wing decidedly more than 3.00, tail not loss thau 

 2.20). 



Similar in plumage to V. solitarius, but upper parts 

 much darker (" nearly uniform blackish plum- 

 beous, with only a ftiint tinge of greenish on the 

 back, which is essentially coneolor with the 

 crown") ; wing 3.03-3.30, tail 2.21-2.31, bill from 

 nostril .30-.36, tarsus .72-75. Hab. Higher 

 southern Alleghanies (western North Carolina, 



etc.) 629c. V. solitarius alticola Brewst. 



Mountain Solitary Vireo.' 



e'. Sides and flanks tinged with plumbeous-gray, but with little 



if any olivaceous or yellowish tinge ; back, rump, and 



upper tail-coverts plumbeous-graj', verj- slightly, if at all, 



tinged with olive-green. 



Above plumbeous, or plumbeousgraj-, with the usual 

 white markings on wings and sides of head ; lower 

 parts white, the sides and flanks strongly tinged with 

 plumbeous-gray; length 5.75-6.15, wing 3.05-3.30 



I Vireo aolilariut nllicola Brrivst., Auk, iii. Jan. 1SG6, 111. 



eo 



