38 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



June), wing 105.2-111.4 (108.6), tail 47.0-50.6 (48.6), culmen from 

 base 9.8-10.6 (10.2), tarsus 10.3-11.7 (11.2) mm. 



Females (10, taken in the breeding range, April to July 2) , wing 99.7- 

 104.3 (102.0), tail 45.3-49.5 (47.0), culmen from base 9.3-10.6 (10.2), 

 tarsus 10.3-11.8 (11.2) mm. 



Winter migrant from the north, found locally along the lower chan- 

 nels of the larger rivers. This is the breeding form of the eastern 

 United States, southern Ontario, and southwestern Quebec. In Pan- 

 ama, in the season of migration and the northern winter it is found 

 regularly in small flocks along the larger stream channels in the low- 

 lands. Museum specimens examined include 5 males and 12 females, 

 collected from December 14 to March 8, in Bocas del Toro ( Almirante, 

 Changuinola), western Colon (Rio Indio), and northern Canal Zone 

 (Juan Mina, above Gamboa, and Gatun). 



[I entertain doubts about separating the subspecies fulvipennis and 

 psammochroa from serripennis but A. R. Phillips recognizes all three 

 and has identified specimens of each from Panama. Many of those 

 identified as psammochroa by Wetmore were considered to belong to 

 serripennis by Phillips. We have not located an account or synonymy 

 for the race fulvipennis among Wetmore's manuscript material and it 

 is not clear whether its omission was an oversight. In his card file is a 

 hand- written entry (dated July 1958) indicating that he considered a 

 specimen from Calovevora, Veraguas, in the British Museum to be re- 

 ferable to fulvipennis, but in the Smithsonian collections the only speci- 

 mens so labeled by Wetmore are a few very old ones from Costa Rica. 

 An adult female specimen taken by Wetmore on June 10, 1953, at 

 Llano del Jardino, 15 miles east of Sona, Veraguas, he originally identi- 

 fied as uropygialis and then as a hybrid between uropygialis and fulvi- 

 pennis. Wetmore was doubtless influenced by the mid-summer date, 

 however. As the specimen shows no trace of any of the characters of 

 uropygialis, it would have to be assigned to serripennis in the broad 

 sense. It may represent a bird that simply failed to migrate north in 

 the spring. S. L. O.] 



STELGIDOPTERYX RUFICOLLIS PSAMMOCHROA Griscom 



Stelgidopteryx ruficollis psammochrous Griscom, Proc. New England Zool. Club, 

 vol. 11, December 14, 1929, p. 72. (Oposura, Sonora.) 



Characters. — Like Stelgidopteryx ruficollis serripennis, but averag- 

 ing slightly paler on upper surface. Scapulars, upper wing coverts, and 

 outer web of secondaries and inner primaries edged pale reddish brown. 



