BIRDS OF NORTH AND MIDDLE AMERICA. 



113 



RAMPHOCELUS ICTERONOTUS Bonaparte. 

 YELLOW-RUMPED TANAGER. 



Adult m'ale. — Intense glossy ])lack; whole lower back, rump, and 

 upper tail-coverts rich pure lemon yellow, the yellow feathers with 

 basal half pure white; bill pale l)lue (darker, more plumbeous in dried 

 skins) with black tip; iris red;' legs and feet gra^nsh dusky (bluish in 

 life); length (skins), 147.3-190.5 (169.9); wing, 78.7-8S.6 (84.1); tail, 

 69.6-78.7 (73.9); exposed culmen, 11.7-16.8 (15.2); depth of bill at base, 

 8.1-9.4 (8.9); tarsus, 22.9-24.9 (23.9); middle toe, 15.5-17.3 (16.5).' 



Adult female. — Pileum, hindneck, back, and scapulars dusky olive, 

 the scapulars and interscapulars, in fresh plumage, margined with 

 yellowish olive; lower back, rump, and upper cail-coverts clear 3^ellow 

 (lemon or canary), the feathers with basal portion grayish; wings and 

 tail dusky, the wing-coverts and tertials margined with light olive or 

 yellowish olive; underparts yellow (canary or sulphur), deeper (lemon 

 or deep canary) on chest, paler (sometimes dull whitish) on chin; bill, 

 iris, legs, and feet as in adult male; length (skins), 152.4-174 (160.3); 

 wing, 75.7-82.8 (79.2); tail, 69.3-79 (72.4); exposed culmen, 13-15.5 

 (14.7); depth of bill at base, 7.9-8.6 (8.1); tarsus, 22.1-24.4 (23.4); 

 middle toe, 15.5-17 (16).=^ 



Yoioig male in first year. — Exactly like the adult female in colora- 

 tion. 



Immature male. — Variously intermediate, according to age, between 

 the adult male and female. 



Veragua (Santiago) through western and central Colombia to west- 



1 According to Sclater, Proc. Zool. See. Lond., 1859, 139. 



^ Ten specimens. 



•' Five specimens. 



Specimens from western Ecuador average larger than those from the Isthmus of 

 Panama, but the difference is \>y no means constant, and I am not able to detect any 

 constant difference in coloration, though some adult males from Guayaquil have the 

 rump paler yellow (canary yellow) than any examined from the isthmus. Average 

 measurements are as follows: 



Locality. 



MALES. 



Six adult inales from Isthmu.s of Panama 



Four adult males from western Ecuador (Guaya 

 quil) 



FEMALES. 



Four adult females from Isthmus of Panama 



One adult female from western Ecuador (Guaya 



quil) 



Wing. 



82.8 

 86.4 



78. .5 

 82.0 



72. (i 

 7(1. 2 



70.6 

 79.0 



Ex- 

 posed 

 culmen. 



l.-i.O 

 15.7 



14.. "S 

 1,5. 2 



Depth 

 of bill 

 at base. 



8.6 

 8.9 



8.1 

 8.1 



Tarsus. 



Middle 

 toe. 



23.4 : 16.3 



i 



24. 6 1 7. 



23. 1 16. 



23.9 ! 15.7 



3654— VOL 2—01- 



