FAMILY PARULIDAE 



277 



outer secondaries with yellowish white on edge of outer web, and in- 

 nermost secondaries with white on edge of outer web; three outer pairs 

 of rectrices white, tipped black, next pair black with white patch on in- 

 ner web, remaining pairs black; lores, superciliary, side of neck, throat, 

 and upper breast light orange, becoming bright orange in February; 

 side of face and line through eye black; lower breast and rest of under- 

 surface fading to pale orange-yellow; black stripes on side of breast 

 and on sides. 



Adult female, upper surface grayish olive, streaked black, with small 

 yellowish white patch in center of crown, often obscured; wings black, 

 with middle and greater coverts tipped white, forming two bars; re- 

 miges with outer web edged grayish olive; rectrices black with white 

 patch on inner web of outer three pairs; lores and superciliary buff- 

 yellow; side of face grayish olive; throat and upper breast from buff- 

 yellow to light orange; rest of undersurface white, tinged buff, with a 

 few black streaks on sides of breast and sides; underwing coverts 

 white. 



Immature, like female, but paler. 



Measurements. — Males (10 from the breeding range, taken in 

 May), wing 64.0-69.0 (67.4), tail 44.6-48.2 (46.4), oilmen from base 

 10.2-11.6 (11.1), tarsus 15.9-18.3 (17.4) mm. 



Females (10 from the breeding range, taken in May), wing 62.0- 

 65.2 (63.8), tail 43.5-47.6 (45.7), oilmen from base 10.7-12.2 (11.3), 

 tarsus 16.4-18.3 (17.2) mm. 



Migrant and winter visitor from the north. Fairly common transient 

 throughout on migration; a few winter in the highland forest of Chiri- 

 qui. In some years it is more common as a winter resident in Chiriqui, 

 equaling Black-throated Green Warblers in numbers. As a migrant the 

 Blackburnian Warbler has been recorded in fall from early September 

 until November 17 (Eisenmann, Smiths. Misc. Coll., vol. 117, no. 5, 

 1952, p. 51 and in spring from March 5, at Garachine, Darien, in 1927 

 (Griscom, Amer. Mus. Nov. no. 282, 1927, p. 10) to April 28, at Mt. 

 Sapo, Darien, in 1941 (Bond and de Schauensee, Acad. Nat. Sci. Phila- 

 delphia, Mon. no. 6, 1944, p. 42). I have also found this species at El 

 Volcan and Santa Clara in Chiriqui during February. It has been re- 

 corded as well from San Jose, Saboga, and Viveros in the Perlas 

 Archipelago and at sea 96 km south of the Pearl Islands (specimen in 

 the British Museum, taken October 24, 1924, by H. J. Kelsall). Some 

 individuals may winter in the Darien highlands. D. fusca is usually 

 seen in middle and high tree levels where it is often a part of mixed 

 flocks of migrant warblers. 



