272 BIRDS OF THE REPUBLIC OF PANAMA PART 4 



Description. — Length 113-131 mm. Adult male, crown and back 

 dark gray, with central crown feathers yellow near base, more or less 

 exposed, and black streaks on back; rump pale lemon yellow; upper 

 tail coverts black, edged gray; lesser wing coverts black tipped gray; 

 middle and greater coverts black tipped white, forming two bars; 

 remiges dusky blackish with outer webs thinly edged gray; rectrices 

 blackish with white spots on inner webs of outer three pairs; lores and 

 ring around eye white, sometimes obscured; side of face gray; under- 

 surface white, with fine black streaks on breast and flanks, and pale 

 lemon yellow patch on upper flank; underwing linings white. 



Adult female, like male, but gray of head and back replaced by gray- 

 ish brown. 



Measurements.- — Males (10 from Panama and Mexico), wing 69.8- 

 75.1 (72.2), tail 52.1-60.5 (56.0), oilmen from base 9.4-12.3 (11.1), 

 tarsus 17.0-18.6 (18.0) mm. 



Females (10 from Panama), wing 66.0-71.8 (68.6), tail 48.1-56.5 

 (53.4), oilmen from base 9.2-11.7 ( 10.4) , tarsus 17.3-18.3 (17.9) mm. 



Winter visitor from the north. Fairly common, at times locally 

 abundant in the western half of the Republic in the Tropical and lower 

 Subtropical Zones; much less common eastward. In Panama the Yel- 

 low-rumped Warbler, while found in more open woodlands and in 

 shrubbery about houses, also feeds regularly on the ground in pastures, 

 cultivated fields, and along the borders of lagoons. In the Chiriqui high- 

 lands and about Almirante and Changuinola in Bocas del Toro, I have 

 found them spread over lawns, attracted by swarms of leaf-hoppers, 

 and elsewhere have noted them in flooded areas or about other bodies of 

 water where gnats were abundant. Charles Handley relates that he has 

 seen these birds hawking insects in the surf at the shore of Isla Basti- 

 mentos, Bocas del Toro; the warblers were catching something at the 

 edge of the water; then darting up just out of reach of the surf, not 

 alighting at any time except on branches of nearby bushes. 



This species has been recorded from November 7, in 1927, at Coco- 

 plum, Bocas del Toro (Chapman, Auk, 1931, p. 121) to March 20, 

 when in 1958 I saw 1 at the La Jagua Gun Club, east of Pacora in the 

 Province of Panama. I have collected many at Santa Clara and El 

 Volcan, Chiriqui, Almirante and Changuinola, Bocas del Toro, and 

 Cerro Campana, Panama. Loftin and Olson (Carib. Journ. Sci., vol. 3, 

 no. 4, 1963, p. 195) mention 1 seen at Tonosi, Los Santos, on March 8, 

 1963, and W.W. Brown, Jr., collected a female on San Miguel in the 

 Pearl Islands on February 23, 1904 (Thayer and Bangs, Bull. Mus. 



