FAMILY TYRANNIDAE 571 



Medium size ; gray, darker above, paler on breast ; abdomen light 

 yellow ; three light wing bars ; bill black. 



Description. — Length 135-150 mm. Bill relatively broader com- 

 pared to other species in the elaenia group of flycatchers. Adult 

 (sexes alike), upper surface, including scapulars, grayish brown, 

 varying from faintly olive-brown when newly grown to definitely 

 gray through fading as the feathers age ; crown with darker shaft 

 lines ; rump often with a faintly paler wash, verging toward cinna- 

 mon ; wings dusky ; lesser, middle, and greater coverts tipped with 

 white to light grayish brown, forming three wing bars ; inner pri- 

 maries and secondaries edged with white to light grayish brown ; tail 

 dusky, with edging of outer rectrices and tips pale grayish white to 

 brownish white ; forehead, a faint supraloral line, and eyelids grayish 

 white; a dusky loral spot in front of eye; side of head back of eye 

 like hindneck, with faint shaft lines of grayish white ; chin and upper 

 throat pale gray to grayish white, changing to pale gray on foreneck, 

 breast, and adjacent sides ; lower breast, abdomen, flanks, and under 

 tail coverts light yellow ; axillars and under wing coverts very pale 

 yellow ; inner margins of wing feathers dull white. 



Juvenile, above dark, somewhat grayish brown, with the feathers 

 tipped narrowly with dull white ; foreneck and upper breast light gray, 

 with indistinct narrow grayish brown tips ; wings and tail as in adult. 



A female, taken on Isla Afuerita, off Bahia Honda, Veraguas, 

 March 22, 1962, had the iris wood brown ; mandibular rami brownish 

 black ; rest of bill fuscous-black ; tarsus, toes, and claws black ; edges 

 of gape dull honey yellow ; inside of mouth honey yellow. Another 

 female, at Puerto Armuelles. Chiriqui, February 19, 1966, had the 

 iris mouse brown ; bill fuscous, darker at tip, paler at base of mandible ; 

 tarsus and toes fuscous-black ; claws black. 



Measurements. — Males (10 from Chiriqui, Veraguas, Herrera, Los 

 Santos, Code, and Canal Zone), wing 69.3-75.2 (71.8), tail 64.7-70.2 

 (66.4), culmen from base 11.4-13.0 (12.2), tarsus 18.0-19.4 

 (18.8) mm. 



Females (10 from Chiriqui, Veraguas, Herrera, Los Santos, 

 eastern Province of Panama, and Isla Taboguilla), wing 67.0-71.1 

 (68.9), tail 63.3-66.7 (65.6), culmen from base 11.4-13.3 (12.2), 

 tarsus 18.0-18.6 (18.2) mm. 



Resident. Found locally in the lowlands of the Tropical Zone on 

 the Pacific slope from western Chiriqui east through Veraguas (in- 

 land to Sona), the eastern side of the Azuero Peninsula, Code, 

 Province of Panama, and the southern Canal Zone, east to the lower 

 Rio Bayano (Chepo) ; recorded eastward along the coast at Maje, 



