580 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



the Province of Bocas del Toro. Nor has this species been reported 

 in Costa Rica, though it seems probable that it will be found there in 

 the lowlands of the Pacific slope, as I saw it west of Puerto Armuelles 

 only a short distance from the international boundary. 



Two eggs are reported to constitute a set. Hellebrekers (Zool. 

 Med. Ryksm. Nat. Hist. Leiden, vol. 24, 1942, p. 259) records those 

 of the nominate race, taken in Surinam, as broadly oval, glossless, 

 cream colored, and unmarked "with measurements of 16.4x12.1 

 and 15.1x11.9 mm." 



The species ranges widely from Panama through northern South 

 America to the Guianas and northern Brazil. While Zimmer (Amer. 

 Mus. Nov., no. 1126, 1941, pp. 2-3) in examination of a large series 

 was unable to distinguish subspecies, from other studies it appears 

 that two races may be recognized. 



Tyrannulus elafus elatus (Latham). 



Sylvia data Latham, Ind. Orn., vol. 2, 1790, p. 549. (Cayenne.) 



Back darker, more olive ; breast and sides averaging darker ; abdo- 

 men somewhat duller yellow. 



From southeastern Colombia and southern and eastern Venezuela 

 to the Guianas and Brazil. 



Tyrannulus elatus panamensis Thayer and Bangs. 

 See reference above. 



Back lighter, more greenish olive ; breast and sides averaging paler ; 

 abdomen somewhat brighter yellow. 



Panama, through Colombia, except the southeast, to western 

 Ecuador. 



ACROCHORDOPUS ZELEDONI ZELEDONI (Lawrence): White- 

 fronted Tyrannulet, Moscareta Frentiblanca 



Pogonotriccus ? zeledoni Lawrence, Ann. Lye. Nat. Hist. New York, vol. 9, 

 March 1869, p. 144. (Dota, Costa Rica.) 



Small ; crown gray ; back dull olive-green ; front line of forehead 

 prominently white ; lower half of bill light colored. 



Description. — Length 107-115 mm; lower end of tarsus distinctly 

 roughened. Adult (sexes alike), crown and hindneck slate color ; back, 

 scapulars, rump, and upper tail coverts light olive-green ; wings dull 

 black ; middle and greater coverts tipped and edged with dull olive- 

 yellow ; secondaries and inner primaries edged with pale yellowish 

 white; tail hair brown, tipped lightly, and the outer feathers edged 



