FAMILY TYRANNIDAE 5II 



Rhynchocyclus marginatus Lawrence, Proc. Acad. Nat. Sci. Philadelphia, 

 December 1868 (April 1869), p. 429. (Lion Hill, Canal Zone, Panama.) 



Rather small ; similar to the Yellow-olive Flycatcher, T. s. flavo- 

 olivaceus, but dorsal color darker, especially on the head, and tail 

 slightly shorter. 



Description. — Crown and hindneck dark mouse gray ; slightly paler 

 on forehead ; back, scapulars, lesser wing coverts, rump and upper 

 tail coverts plain olive-green ; wings dull black ; middle wing coverts 

 tipped, and greater coverts and inner secondaries edged broadly, with 

 yellow ; primaries and outer secondaries edged narrowly with olive- 

 yellow ; a narrow supraloral white line extending back from the base 

 of the nasal feathering ; a narrow white line around the eyelids, inter- 

 rupted by a dusky spot at the anterior angle of the eye; tail grayish 

 brown, edged with olive-green ; chin, f oreneck, upper breast, and 

 sides pale gray, with a faint tinge of yellow ; rest of under surface 

 light yellow ; a dusky spot on the under primary wing coverts ; rest 

 of under wing coverts, axillars, and inner edge of wings yellowish 

 white. 



A male collected at Caiiita, on the lower Rio Bayano, eastern 

 Province of Panama, February 8, 1962, had the iris pale mouse 

 brown ; maxilla black ; mandible brownish white ; tarsus and toes dark 

 neutral gray; claws black. A female, at Pucro, Darien, January 31, 

 1964, had the iris mouse brown, maxilla black, mandible dull white, 

 shaded with dull brown for the anterior half on the sides; tarsus and 

 toes bluish neutral gray ; claws black. 



Measurements. — Males (10 from Code, Province of Panama, 

 Canal Zone, and San Bias), wing 63.5-66.8 (64.2), tail 48.3-52.5 

 (50.6), culmen from base 12.^14.2 (13.8), tarsus 15.7-16.9 (16.3) 

 mm. 



Females (10 from Chiriqui, Canal Zone, and Darien), wing 58.6- 

 63.2 (60.4), tail 44.7-48.5 (47.1), culmen from base 13.3-14.2 (13.8), 

 tarsus 15.7-16.8 (16.3) mm. 



Resident. Found locally in the Tropical Zone in humid forests ; on 

 the Pacific slope from the Canal Zone east through Darien, with single 

 records farther west for western Chiriqui and Cerro Campana. On 

 the Caribbean side in Bocas del Toro, near Almirante, northern 

 Veraguas, and from the Rio Indio, eastern Colon, and the Canal 

 Zone to the Colombian boundary in San Bias. 



The only present record for Chiriqui is one specimen taken by Dr. 

 Frank Hartman, March 12, 1951, on Cerro Pando, beyond El Volcan. 

 On March 8 of this same year I secured a male in heavy forest at 

 850 meters on Cerro Campana. On the Caribbean side at Almirante, 



