FAMILY FORMICARIIDAE I9I 



slaty brown ; tail tipped narrowly with white ; wing coverts plain, 

 without white. 



A male, collected at Juan Mina, Canal Zone, January 14, 1961, 

 had the iris dull reddish brown ; bill black ; tarsus and toes neutral 

 gray ; claws dark neutral gray. In another from El Llano, Panama, 

 February 5, 1961, the iris was wood brown; bill black; tarsus and 

 toes bluish gray ; claws black. 



A female, at El Llano, February 4, had the iris light brown ; maxilla 

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

 claws dusky neutral gray. In another, in the collection of R. S. 

 Crossin, taken at Gamboa, Canal Zone, August 8, 1968, the iris was 

 recorded as dark brown ; maxilla slate ; mandible pale gray. 



Measurements. — Males (10 from Panama), wing 65.7-69.9 (66.8), 

 tail 62.^69.4 (65.6), culmen from base 18.4-20.0 (19.2), tarsus 

 23.4-24.8 (24.2) mm. 



Females (10 from Panama), wing 59.3-63.2 (61.3), tail 57.0-63.0 

 (59.6), culmen from base 18.0-18.6 (18.2), tarsus 22.0-23.6 

 (22.8) mm. 



Weight, cT 18 grams; $ 13 grams (G. V. N. Powell). 



Common in lowland forest on the Pacific side from western 

 Veraguas (west of Zapotillo, near the Rio Bubi), east commonly 

 to the lower Rio Bayano (El Llano), including the Azuero Peninsula 

 (to Punta Mala), less commonly to the lower levels of Cerro Pirre 

 (Cana), Darien ; on the Caribbean slope from western Colon (Rio 

 Indio) east through the Canal Zone (locally) to western San Bias 

 (Mandinga) ; islas del Rey, Viveros, and Canas, Archipielago de las 

 Perlas. 



These are forest birds, often with restricted and irregular range, 

 probably due in part to extensive clearing, but also elsewhere for 

 reasons that are not clear. In 1953 I found them in small number 

 in western Veraguas west of Zapotillo on a small stream tributary 

 to the lower Rio Bubi, and also on the Rio San Pablo, below Sona, 

 though Arce many years earlier did not secure specimens for Sclater 

 and Salvin in this area. In 1948 I found it near Parita (at El Bar- 

 rero) and at Punta Mala, and in 1957 at Los Asientos, the latter 

 two localities in Los Santos. It has not been reported on the western 

 side of the Azuero Peninsula. It has been recorded regularly in the 

 Canal Zone, more commonly in the lower Chagres Valley (but not 

 on Barro Colorado Island ) . Farther east we found it near Pacora 

 and Chepo, and it is known from El Llano on the lower Bayano. In 

 Darien, Bond and de Schauensee (Acad. Nat. Sci. Philadelphia, 

 Mon. 6, 1944, p. 33) recorded it at Garachine, and Griscom (Bull. 



