FAMILY TYRANNIDAE 517 



female in gallery forest near the base of the hills toward Las Pefiitas, 

 above the lower course of the Rio Imamado. This was at the northern 

 end of the trail leading across the hills toward Colombia. It was the 

 only one seen. The related species, R. o. bardus, was common through 

 the slightly lower adjacent forests at the mouth of the Imamado, and 

 along the Rio Jaque in this area. 



In view of this, it has been interesting to consider the thesis of 

 Haffer (Auk, 1967, pp. 354-362) concerning allopatric species pairs 

 of birds in adjacent Colombia, as related to R. brevirostris and R. 

 olivaceus. (To his data on the lowland occurrence of brevirostris the 

 preceding accounts give additional localities in Veraguas, and those 

 above in eastern Darien.) In further comment, the record by Cassin 

 (Proc. Acad. Nat. Sci. Philadelphia, vol. 12, 1860, p. 144) where he 

 listed "Cydorhynchus brevirostris," is based on three specimens of 

 Rhynchocyclus olivaceus mints in the U.S. National Museum, taken 

 by A. Schott, attributed only to the "Survey of the Atrato R. New 

 Granada. Lt. R. Michler, U.S.A." These ancient skins are flattened, 

 somewhat faded so that the buff edgings of the wings are paler, but 

 with the upper tail coverts distinctly olive-brown, and the tail with 

 browner edges, so that they are identified without hesitation as the 

 subspecies mirus. There is no indication in them of hybridization 

 between the two species under discussion. 



TODIROSTRUM NIGRICEPS Sclater: Black-headed Tody- 

 flycatcher, Moscareta Enana Cabecinegra 



Todirostrum nigriceps P. L. Sclater, Proc. Zool. Soc. London, pt. 23, May 16, 

 1855, p. 66, pi. 84, fig. 1. (Santa Marta, Magdalena, Colombia.) 



Very small ; crown, hindneck, and side of head black ; breast yellow. 



Description. — Length 75-83 mm. Adult (sexes alike), crown and 

 hindneck black ; upper back and scapulars yellowish olive-green ; 

 lower back and rump grayish olive-green ; upper tail coverts the 

 same, or in some partly white ; wings black ; middle and greater 

 coverts tipped and edged with yellow ; inner primaries also edged 

 with yellow, this becoming nearly white on inner secondaries ; tail 

 fuscous, margined narrowly with olive-green ; side of head black (like 

 pileum) with lower auricular area lined lightly with white; throat 

 and upper f oreneck white ; tibia black, tipped with dull yellow ; rest 

 of under surface including edge of wing yellow, paler on under tail 

 coverts ; under wing coverts paler yellow ; under surface of primaries 

 edged with dull white. 



A male, collected near Pacora, Panama, March 23, 1961, had the 



