FAMILY TYRANNIDAE 533 



very short and narrow ; above grayish olive-green, including the lesser 

 wing coverts ; crown feathers darker in center ; wings dusky, edged 

 with olive-green, the edging changing to pale yellow on the secon- 

 daries ; middle and greater wing coverts edged and tipped with dull 

 huffy white; lores dull huffy white; sides of head and of breast light 

 brownish gray ; under surface dull white becoming pale yellow on 

 flanks and under tail coverts ; chin and throat indistinctly streaked 

 with dull brownish gray, these markings extending less definitely to 

 upper breast ; tibia brownish gray ; axillars and under wing coverts 

 pale yellowish white ; inner margins of under side of wing feathers 

 edged narrowly with dull white. 



Adult female, similar, but with the four outer primaries some- 

 what larger and longer. 



Juvenile, outer primaries broader ; crown without central streak- 

 ing; forepart of body suffused with buff; throat without streaks. 



A male, collected at Nueva Gorgona, western sector of Province 

 of Panama, March 17, 1951, had the iris light yellow; base of 

 mandible dull ivory-white ; rest of bill dusky ; tarsus and toes light 

 brown ; claws dusky. 



A female taken at Gago, Code, January 20, 1963, had the iris 

 yellowish buff ; tip of bill black ; base of maxilla to nostril mouse 

 brown ; base of mandible dull white ; tarsus and toes pale mouse 

 brown ; claws dusky neutral gray. 



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

 Herrera, Province of Panama, and Canal Zone), wing 39.2-41.1 

 (40.4), tail 32.4-39.2 (36.8), culmen from base 9.^11.3 (10.7), 

 tarsus 14.8-16.2 (15.4) mm. 



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

 and Province of Panama), wing 38.2-39.7 (39.2), tail 30.1-33.6 

 (32.2), culmen from base 9.9-11.9 (10.9), tarsus 14.7-15.8 

 (15.4) mm. 



Resident. Common in thickets and open woodlands ; on the Pacific 

 slope from the lowlands of Chiriqui (Alanje, David) east through 

 southern Veraguas, the eastern side and southern end of the Azuero 

 Peninsula, southern Code, the Province of Panama (east to Panama 

 City) and the southern Canal Zone; less commonly to 900 meters 

 elevation along the foothills in Chiriqui and Veraguas, and to 300 

 meters in southern Code. 



These tiny birds are common in the thickets and open woodlands 

 in the drier areas of the Pacific slope, east to the southern Canal 

 Zone and Panama City, but do not extend to the more humid areas 



