578 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



TYRANNULUS ELATUS PANAMENSIS Thayer and Bangs: 

 Yellow-crowned Tyrannulet, Moscareta Coronilla Dorada 



Tyrannulus rcgidoidcs panamensis Thayer and Bangs, Bull. Mus. Comp. Zool., 

 vol. 46, January 1906, p. 218. (Savanna of Panama, near Caledonia, Panama 

 City, Panama.) 



Small ; under surface yellowish ; above olive-green ; crown dull 

 black, with partly concealed yellow central stripe. 



Description. — Adult male, crown dull black, becoming slate on 

 forehead; a broad yellow stripe in center (in some, slightly orange) ; 

 back, scapulars, and rump olive-green (grayish, olive -green in some) ; 

 upper tail coverts faintly brighter ; wings dusky ; middle and greater 

 coverts edged with white, forming two narrow bars ; secondaries 

 edged narrowly with white; inner primaries edged with dull olive- 

 green ; tail dull grayish brown, in some tipped narrowly with olive 

 to olive-yellow ; anterior lores grayish white, changing to dusky in 

 front of eye, and then continued over the eye as a superciliary line 

 to above the auricular region, changing posteriorly to grayish white ; 

 side of head grayish, with indistinct shaft lines of white ; chin and 

 upper throat grayish white, changing on foreneck to gray, tinged 

 with yellow ; breast and sides olive-yellow becoming light yellow on 

 lower breast, abdomen, flanks, and under tail coverts ; axillars and 

 under wing coverts pale yellow, the latter area dusky toward the 

 carpal edge. 



Adult female, similar, but with crown stripe narrower. 



Juvenile, crown dull black, without the crown stripe, this appear- 

 ing early as a narrow line of white and orange-yellow ; rest of upper 

 surface dull dusky-brown edged with grayish white ; wing coverts 

 dull buff, blackish to dusky centrally, tipped with dull buffy brown ; 

 breast and foreneck in early stages similar to back, but changing early 

 to adult colors ; abdomen, flanks and under tail coverts pale, dull 

 yellow. 



A male taken at Mandinga, San Bias, January 22, 1957, had the iris 

 dull Marguerite yellow ; bill black ; tarsus and toes dark neutral gray. 

 In another, at Puerto Armuelles, Chiriqui, February 8, 1966, the 

 iris was dull yellow ; bill black ; tarsus and toes dusky neutral gray ; 

 claws black. A female, at El Real, Darien, February 18, 1964, had 

 the iris light brown ; bill black ; tarsus and toes dark bluish neutral 

 gray ; claws black. 



Measurements. — Males (10 from Chiriqui, Veraguas, Los Santos, 

 Province of Panama, and Canal Zone), wing 50.5-53.7 (52.4), tail 

 38.7-45.1 (42.2), culmen from base 7.6-8.7 (8.2), "tarsus 12.3-13.8 

 (12.7) mm. 



