FAMILY PARULIDAE 



289 



1966, pp. 206-207) found this species an "uncommon winter resident" 

 that ignored swarms of army ants when they passed by. 



OPORORNIS FORMOSUS (Wilson): Kentucky Warbler, 

 Reinita Hermosa 



Sylvia formosa Wilson, 1811, Amer. Ornith., 3, p. 85, pi. 25, fig. 3. (Kentucky.) 



Small; upper surface yellowish olive, with black markings on head; 

 undersurface bright yellow. 



Description.— Length 114-126 mm. Adult male, forecrown black, 

 with feathers often tipped gray; line from bill to eyebrow and continu- 

 ing around rear of eye to lower rim, yellow; lores, side of face, and 

 side of throat black; rest of upper surface, including tail, yellowish 

 olive; primaries dusky, with outer webs edged yellowish olive; rest of 

 wing yellowish olive; undersurface yellow, with yellowish olive some- 

 times extending from sides to flanks; bend of wing and underwing 

 coverts yellow. 



Adult female, as male, but black areas of head less extensive, often 

 replaced by dusky brown. 



Measurements. — Males (10 from Panama), wing 66.0-71.5 (68.7), 

 tail 45.3-53.3 (48.7), culmen from base 10.4-13.3 (12.0), tarsus 19.4- 

 22.7 (21.4) mm. 



Females (9 from Panama, Costa Rica, and Colombia), wing 64.0- 

 69.6 (65.9), tail 43.3-48.7 (47.2), culmen from base 11.6-13.2 (12.3), 

 tarsus 19.9-22.9 (21.8) mm. 



Migrant and winter visitor from the north. Fairly common, but in- 

 conspicuous, throughout in forest and second-growth woodland, where 

 it inhabits thickets of shrubbery, similar to its northern breeding habi- 

 tat. Although during migration it occurs in the highlands, where it has 

 been collected by W. W. Brown, Jr., as high as 2310 m, near Boquete, 

 Chiriqui, on February 22, 1901 (Bangs, Proc. New England Zool. Club, 

 vol. 3, 1902, p. 62), most wintering individuals are found in the low- 

 lands (Ridgely, 1976, p. 299). The Kentucky Warbler has been re- 

 corded in Panama from September 4 (Willis, Living Bird, 1966, p. 

 207) to April 28, (Loftin and Olson, Carib. Journ. Sci., vol. 3, no. 4, 

 1963, p. 195). 



Banding results indicate that individuals wintering in Panama are 

 highly sedentary and faithful to a site, returning in subsequent years. 

 One banded at Almirante, Bocas del Toro, on October 14, 1963, was 

 retaken there February 25, 1964, and another banded there October 12, 

 1963, was taken again October 29, 1964 (Loftin et al., Bird-Banding, 

 1966, p. 42) . In the Canal Zone, a Kentucky Warbler banded near the 



