BIRDS OF NORTH AND MIDDLE AMERICA. 



61 



tail-coverts plain yellowish olive, the rump and upper tail-coverts 

 more or less tinged with gray; under parts (except throat) lighter, 

 much more j^ellowish, olive, more or less glossed with purplish ])]ue 

 anteriorh" and laterall}^; lesser wing-coverts olive-bluish; middle and 

 greater coverts yellowish olive, the former with slightly hluish tips; 

 alula, primary coverts, and remiges black, the first* two edged with 

 bluish olive or olive-bluish, the last (except outermost and one to three 

 innermo.^t primaries) extensively and abruptl}' clear light yellow (sul- 

 phur or light canary) basally, that on secondaries mostly concealed 

 by greater coverts; under wing-coverts pale yellow, with a broad 

 exterior border of bluish olive or olive-bluish; tail blackish, with dark 

 olive edgings, broader basallj^; bill black, the mandible gra3dsh 

 basall}^; legs and feet dusky (grayish in life?); length (skins), 157.5- 

 175.3 (168.1); wing, 94-102.4 (97.8); tail, 64-73.4 (68.3); exposed cul- 

 men, 11.2-12.7(11.9); depth of bill at base, 7.6-8.1 (7.9); tarsus, 20.8- 

 22.6 (21.8); middle toe, 14.7-17.3 (16).^ 



Adult female. — Similar to adult male, but blue of head and neek 

 slightly duller, especially on throat, under parts less strongl}' twinged 

 with blue, and black of wings and tail rather duller; length (skins), 

 163.8-167.6 (166.4); wing, 93.5-96.5 (95.3); tail, 65-68.8 (66.8); 

 exposed culmen, 12.2-13 (12.4); depth of bill at base, 7.9-8.1 (8.1); 

 tarsus, 20.8-22.4 (21.8); middle toe, 15.2-16 (15..5).' 



Young {first plumage).- — No blue on head or neck; upper parts, 

 except wings and tail, plain grayish olive, darker on back; under parts 

 nmch paler olive, tinged with yellow posteriorly; wings and tail as in 

 adults, but remiges, etc., and rectrices duller black, or dusky, the sec- 

 ondaries with the basal yellow less pure and less sharply defined. 



Southern Mexico, in states of Tamaulipas (Alta Mira), Vera Cruz 

 (Jalapa; Cordova; Orizaba), Mexico (valley of Mexico), Oaxaca, etc., 



' Ten specimens. 



^ Four specimens. 



Specimens from different localities average as follows: 



I am unable to discover any color difference between specimens from extreme 

 points of the range of the sjiecies. 



