FAMILY FORMICARIIDAE I59 



wings olive-brown, the feathers edged with bufify brown ; a narrow 

 white line around edge of eyeHds ; side of head gray to brownish gray, 

 lined and spotted with black and buff ; central under surface white 

 to bufif with f oreneck and breast streaked narrowly with black ; 

 sides grayish to grayish brown ; under wing coverts and inner edg- 

 ing of wing feathers pale buff to cinnamon-buff. 



A male, collected March 3, 1963, at Armila, San Bias, had the iris 

 light gray ; maxilla black ; mandible neutral gray ; tarsus, toes, and 

 claws neutral gray. 



Measurements. — Males (8 from Bocas del Toro, Darien, and San 

 Bias), wing 55.6-60.7 (58.6), tail 33.8^0.0 (36.2, average of 7), 

 culmen from base 16.0-19.7 (18.0, average of 6), tarsus 19.6-20.6 

 (20.0, average of 7) mm. 



Females (8 from Bocas del Toro, Code, and Darien), wing 54.3- 

 59.2 (57.0), tail 33.4-36.0 (34.5), culmen from base 16.5-18.9 (17.7, 

 average of 7), tarsus 19.0-20.6 (19.7) mm. 



Resident. Found locally in areas of humid forest in the Tropical 

 Zone ; on the Pacific slope, in Darien, from the base of Cerro Sapo to 

 Jaque ; on the Caribbean side from Bocas del Toro east through the 

 northern Canal Zone to eastern San Bias ; to 600 to 725 meters 

 elevation in Bocas del Toro. 



In the summer of 1926 (Griscom, Amer. Mus. Nov., no. 280, 

 1927, p. 2) R. R. Benson, with Dale V. Gaffney, crossed from 

 Santa Fe to the Rio Calovevora, where they found this bird common 

 and collected a series. Peters (Bull. Mus. Comp. Zool., vol. 71, 1931, 

 p. 320) recorded it at Almirante, Bocas del Toro, and at 600 meters 

 on the trail from Chiriqui Grande to Boquete. 



Male and female were taken by R. Hinds at 725 meters on the 

 upper Rio Changuena, in September 1961. In 1952, I collected fe- 

 males on the Rio Indio at El Uracillo, northern Code, March 4, and 

 at Chilar, western Colon, March 8. 



In Darien, Bangs and Barbour (Bull. Mus. Comp. Zool., vol. 65, 

 1922, p. 206) recorded it on the base of Cerro Sapo. Griscom (idem, 

 vol. 72, 1932, p. 344) noted male and female from Cituro and the 

 Rio Cupe, taken by Richardson. In 1946, I secured one at Jaque on 

 the coast near the Colombian border, and in 1947 another inland 

 on the Rio Jaque. In eastern San Bias it is known from Armila and 

 Puerto Obaldia. 



It is fairly common on Barro Colorado Island, Canal Zone, where 

 several nests have been recorded. A. O. Gross (Smithsonian Ann. 

 Rep. for 1926, 1927, pp. 338-339, pi. 8) found one July 6, 1925, 



