BIRDS OF NORTH AND MIDDLE AMERICA. 



509 



Adult female. ^AhoYG plain yellowish olive-g-reen (usually darker 

 than in adult male), the pileum concolor with the back, or at least not 

 distinctly more yellowish; wings and tail as in adult male, but tips of 

 middle wing-coverts and broad edgings of greater coverts and second- 

 aries less purely yellow, usually yellowish olive-green; under parts 

 paler and duller yellow than in adult male, usually without streaks, 

 but sometimes with a few, usually indistinct, chestnut streaks on chest 

 and sides; length (skins), 103-11) (lOS.T); wing, 57-68 (59.6); tail, 

 39-45 (42.2); exposed culmen, 10-11 (10); tarsus, 17-20 (18.6); middle 

 toe, 10-12 (10.8).^ 



Young male in first aHtumn.—Yery similar in coloration to adult 



females. 



Young female hi first autum7>. Shmhiv to duller colored adult 

 females, but duller olive-green above and with under parts dull olive- 

 whitish, slightly tinged with yellow, the under tail-coverts pale yellow. 



Young {nesth'ng).~Ahove brownish gray or pale grayish brown; 

 wings dusky, the middle and greater coverts broadly tipped with pale 

 yellowish, forming two distinct bands, the greater and primary coverts 

 edged with light olive, the remiges more narrowly and sharply edged 

 with yellowish white; orbital ring, chin, throat, chest, and anterior 

 portion of sides pale buffy grayish, the remaining under parts white, 

 tinged on flanks with pale bufl". 



North America in general, except Alaska and north Pacific coast from 

 Vancouver Island northward, and southwestern United States (western 

 Texas to Arizona) ; migrating southward in winter through eastern Mex- 

 ico and Central America to Colombia (Turbo, Santa Marta, Ocana, 

 Bogota, etc.), Ecuador (Esmeraldas, La Concepcion, Valle del Chota, 

 etc.). Venezuela (Carupano, Lake of Valencia, etc.), northern Brazil 



1 Seventeen specimens. 



I am not able to make out satisfactorily a western form {D. .r. viorcomi Coale). 

 Western specimens seem, as a rule, to have shorter wings and longer tail than eastern 

 examples, and adult males are often much less heavily streaked beneath; but the 

 differences appear nmch too inconstant to justify recognition of a western subspecies. 

 Average measurements are as follows: 



Locality. 



Nine adult males from Atlantic States 



Seven adult males from Mississippi Valley 



Eight adult males from Rocky Mountain district. 

 Eight adult males from California 



Eight adult females from .\tlantic States 



Three adult females from Mississippi Valley 



Four adult females from Rocky Mountain district. 

 Two adult females from California 



Wing. Tail. 



63 



63.2 

 62.8 

 61.1 



58.7 

 62.3 

 59.7 

 59 



45.4 

 44.2 

 46.4 

 46 



41.2 

 42 



44.2 

 43 



Ex- 

 posed 

 culmen. 



10.2 

 10.2 

 10 

 10.1 



10 

 10 



10.2 

 10 



18.6 



18.7 

 18.8 

 18 



18.5 

 18 



19.6 

 19 



Middle 

 toe. 



11.1 

 11 

 11 

 10.8 



10.8 

 10.6 

 11 

 10.5 



