FAMILY TYRANNIDAE 461 



Measurements. — Males (10 from Los Santos, Code, Canal Zone, 

 Bocas del Toro, eastern Colon, and eastern Province of Panama), 

 wing 67.5-74.0 (70.7), tail 55.0-62.5 (59.7), culmen from base 14.2- 

 16.5 (15.4), tarsus 12.5-13.8 (13.3) mm. 



Females (10 from Los Santos, Bocas del Toro, Canal Zone, and 

 eastern Province of Panama), wing 66.1-72.2 (69.6), tail 53.1-60.6 

 (57.9), culmen from base 13.8-15.3 (14.5). tarsus 12.7-13.6 

 (13.2) mm. 



Stone (Proc. Acad. Nat. Sci. Philadelphia, vol. 70, 1918, p. 267) 

 quotes notes from Jewel that describe the iris as brown, maxilla black, 

 mandible yellow, and feet black. 



Resident. Common locally on the Pacific slope from western 

 Chiriqui east to western Darien, including the Azuero Peninsula, ex- 

 cept in the treeless savanna areas ; on the Caribbean side from western 

 Bocas del Toro to eastern Colon and the lower Chagres Valley ; Isla 

 Cebaco in Golfo de Montijo; ranging to 750 meters in hill country. 



March 27, 1957, I found several in the border of the mangrove 

 swamps below Tonosi, Los Santos, on the lower end of the Azuero 

 Peninsula. One was taken near Chiman, eastern Province of Panama, 

 February 20. 1950. Salvadori and Festa (Bol. Mus. Zool. Anat. 

 Comp. R. Univ. Torino, vol. 14, 1899, p. 5) record one from Punta de 

 Sabana, on the lower Rio Tuira in August 1895. Bond and de 

 Schauensee (Acad. Nat. Sci., Philadelphia, Mon. 6, 1944, p. 38) 

 report one from Garachine, Darien, the most eastern record. 



This small resident pewee is found in areas of thickets and scattered 

 trees where usually it rests on rather low perches. It seldom enters 

 tall heavy stands of forest except at the borders. Its smaller size and 

 slender, less robust form may attract attention, but in life it is difficult 

 to distinguish from the larger species of the north that visit Panama 

 in their migrations. When seen clearly near at hand, the small 

 grayish white loral area is distinctive in occasional individuals. In 

 the hand, the species is easily identified by examination of the outer 

 primaries, where the tenth (outermost) is shorter than the sixth. 

 In the other wood pewees this outer primary is distinctly longer 

 than the feather mentioned. 



The only call that I have heard them utter is a low sivees sii, being 

 suggestive in tone of the calls of some species of Ernpidondx. Skutch 

 (Pac. Coast Avif. 34, 1960, 322-327) in Costa Rica at dawn heard 

 them giving a song composed of a steady repetition of a single note, 

 weet weet zveet, varied by a lower call wc-yc that at times was con- 

 tinued briefly as a warbling sound. 



