262 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



The migrant races of the Yellow Warbler are very common in the 

 lowlands of both slopes and on the islands off the Pacific Coast, as well 

 as inland. They are found in a variety of habitats from forest border 

 to mangrove to gardens and grassy areas at the edge of taller vegetation. 

 They often deliver chip or tsip notes, but I have never heard a migrant 

 or wintering Yellow Warbler sing in Panama; Skutch (A Naturalist 

 in Costa Rica, 1971, p. 104), however, has found individuals maintain- 

 ing a winter territory from which they may sing while driving away in- 

 truders. A male of one of the migrant races collected by E. A. Gold- 

 man at Cana, Darien on March 19, 1912, contained 1 Leptostylus sp. 

 25%, 2 small cerambycids 2%, 1 elatrid 2%, 3 minute calandrids 4%, 

 another beetle 2%, bits of a membracid 2%, caterpillar remains 25%, 

 an arachnid and 1 egg 3%, 12 ants 30%, 2 other Hymenoptera 5%. 



In the Canal Zone, Eisenmann considers the migratory Yellow War- 

 bler, during the months of the northern winter, the fourth most com- 

 mon parulid, exceeded in numbers only by the Bay-breasted, Chestnut- 

 sided, and Tennessee Warblers. 



H. von Wedel (Peters, Bull. Mus. Comp. Zool., vol. 71, 1931, p. 333) 

 collected a migrant female at Almirante, Bocas del Toro, on August 13, 

 1928, and L. L. Jewel (Auk, 1913, p. 428) recorded it at Gatun, Canal 

 Zone, on May 12, 1912. Most migrants do not arrive before late Au- 

 gust, and depart by late April. A Yellow Warbler banded at Almirante 

 on November 11, 1962, was recaptured there 9 weeks later, on January 

 9, 1963 (Loftin, Bird-Banding, 1963, p. 220). 



Mr. M. Ralph Browning has very kindly identified the migrant Yel- 

 low Warblers from Panama now in the Smithsonian collections. 



DENDROICA PETECHIA AMNICOLA Batchelder 



Dendroica aestiva amnicola Batchelder, 1918, Proc. New England Zool. Club, 6, 

 p. 82. (Curslet, Newfoundland.) 



Characters. — "Similar to D. a. aestiva, but stated to differ in the male 

 sex by darker green, less yellowish — between warbler green and sul- 

 phine yellow — back; more restricted and duller yellow of the forehead; 

 narrower as well as duller, citron yellow rather than strontian yellow, 

 edges to the remiges; and on average less richly colored underparts 

 with darker chestnut streaks; female duskier, less yellowish above. . . . 

 distinguished [from rubiginosa] by the yellow forehead contrasting 

 with the green of the back." (Hellmayr, Field Mus. Nat. Hist. Zool. 

 Ser,vol. 13, pt. 8, 1935, p. 365.) 



The race amnicola breeds from north-central Alaska to central Labra- 



