FAMILY TYRANNIDAE 389 



rump and upper tail coverts similar, but edged with rusty or cin- 

 namon ; tail sooty to blackish brown, the feathers edged lightly with 

 pale to dull cinnamon ; wings brownish black, with coverts, secon- 

 daries, and inner primaries edged with dull white ; side of head dusky 

 black ; malar region and throat white, with a narrow dusky line sepa- 

 rating them ; lower foreneck. breast, sides, flanks, and under tail 

 coverts white to pale yellow, streaked with dark gray ; central abdo- 

 men white to pale yellow ; axillars and under wing coverts pale 

 yellow ; inner webs of primaries and secondaries cinnamon. 



Juvenile, grayish brown above, without central crown patch ; super- 

 ciliary, edgings of wing coverts and of tail cinnamon-rufous ; under 

 surface pale yellow, with few or no streaks. 



The species has a wide distribution from southern Mexico through 

 Central America and South America to northern Argentina and 

 Brazil. From Costa Rica northward it is migratory. Its status in 

 Panama as a resident from available data is not wholly clear. 



Two races currently are recognized based on difference in size, 

 the smaller nominate form being found from Nicaragua southward. 

 The larger L. I. variegatus, the breeding form from southern Mexico 

 to Guatemala, is migrant after the nesting season to South America. 

 The two are reported to intergrade through Honduras (Monroe, 

 Birds of Honduras, 1968, p. 255). 



LEGATUS LEUCOPHAIUS LEUCOPHAIUS (Vieillot) 



Platyrhynchos leiicophaius Vieillot, Nouv. Diet. Hist. Nat., nouv. ed., vol. 27, 

 December 1818, p. 11. (Cayenne.) 



Characters. — Smaller, more slender in form. 



A male, taken at La Jagua, Panama, March 23, 1961, had the iris 

 dark mouse brown ; bill black ; tarsus and toes fuscous-black ; claws 

 black. Another male, at Puerto Armuelles, Chiriqui, March 9, 1966, 

 was similar, with the inside of the mouth orange. In a female from 

 El Potrero, Code, March 8, 1962, the iris was dark brown ; bill, 

 tarsus, and toes black. 



Measurements. — Males (20, Chiriqui to Darien), wing 79.6-84.2 

 (81.1), tail 54.4-60.0 (56.4), culmen from base 12.7-14.5 (13.4), 

 tarsus 14.6-16.7 (15.5) mm. 



Females (17, Chiriqui to Darien), wing 75.2-81.8 (78.6), 

 tail 52.7-57.8 (55.7), culmen from base 12.4-14.1 (13.3), tarsus 

 14.8-16.3 (15.5) mm. 



Recorded from January to late October throughout the lowlands ; 

 from 1280 to 1580 metefs in western Chiriqui; 600 meters above El 



