go SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
While the Coiba series is listed under the subspecific name xantho- 
tera this allotment for the present is tentative. For several years I 
have obtained specimens of this warbler wherever practicable. On 
the Pacific coast of Panama birds that represent D. p. aequatorialis 
are available from the mouth of Rio Majé, near the western boundary 
of Darién, west to the swamps of the Rio Chame below Bejuco, at 
the western border of the Province of Panama. Beyond this point, 
to the west, there is a different population. Specimens from the east- 
ern side of the Azuero Peninsula, from the mouth of the Rio Vidal, 
near the eastern boundary of Chiriqui, and from Isla Coiba, are 
intermediate between aequatorialis and xanthotera. Males resemble 
the latter in the darker brown of the head cap and the ventral streak- 
ing, and the former in the heavier streaking of the breast and sides, 
and the greater extension of the brown on the foreneck. They differ 
thus from santhotera in the decidedly greater extent of the brown 
streaks and brown foreneck. It may be desirable to separate this 
intermediate population by name, but judgment on this is held until 
it has been possible to secure specimens from farther west, along 
the coasts of Chiriqui. 
DENDROICA PETECHIA AESTIVA (Gmelin): Yellow Warbler, 
Canario de Paso 
Motacilla aestiva GMELIN, Systema naturae, vol. 1, pt. 2, 1789, p. 996. (City 
of Quebec, Canada. ) 
While the yellow warblers of the United States and Canada are 
placed currently in the same species as the golden warblers of the 
American Tropics it is convenient to list them separately, and to 
recognize them as “yellow warblers” in the Republic of Panama, 
where they are common during the period of northern winter, in 
order to distinguish them from the quite different resident canarios 
mangleteros. They were found in small numbers during my stay on 
Coiba, mainly in low growth back of the beaches, and bordering 
mangrove swamps, and also in abandoned fields grown to brush. The 
English name expresses the yellow color that marks them from others 
of like size as they appear momentarily among the leaves. When 
encountered in the swamps they may usually be distinguished from 
the golden warbler by smaller size and more active movements. 
The seven taken include two geographic races, which ranged to- 
gether. Specimens of the present subspecies were taken January 8, 
II, 21, and 26. 
