176 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



tarsus, toes, and claws bluish neutral gray ; top of the tongue and 

 fauces orange. 



An immature male, in which only a slight amount of black had 

 appeared on the throat, taken at the same point on February 21, had 

 the iris dark brown ; bill black with a narrow line of dull white on 

 posterior half of cutting edge ; gape faintly honey yellow ; tarsus, 

 toes, and claws dark neutral gray ; tip of tongue and inside of mouth 

 orange. 



An adult female, collected at El Volcan, Chiriqui, March 15, 1965, 

 had the iris dark brown. 



Measurements. — Males (10 from Panama), wing 55.5-58.3 (57.1), 

 tail 34.2-39 A (36.1), culmen from base 13.6-15.1 (14.2), tarsus 

 16.1-16.9 (16.4) mm. 



Females (10 from Panama), wing 52.4-56.3 (54.4), tail 33.3- 

 36.7, (35.0), culmen from base 13.0-14.5 (13.9), tarsus 16.1-16.8 

 (16.4) mm. 



Alden Miller (Univ. Cal. Publ. Zool., vol. 66, 1963, p. 25) re- 

 corded weights of M. s. schisticolor at San Antonio, Valle, Colombia, 

 in three males as 10.0 to 10.8 grams, and in one female as 9.8 grams. 



Resident. Locally common on the Pacific slope in areas of forest, 

 from western Chiriqui, mainly in the upper Tropical and Subtropical 

 zones, less frequently in the lowlands ; less common in the Azuero 

 Peninsula ; not recorded between Cerro Campana and Cerro Azul. 

 Recorded at the Rio Calovevora, Caribbean slope of Veraguas. 



This is the most common ant-wren of the western half of the 

 Pacific slope in the Republic, east to and including Cerro Campana. 

 After a brief break in the range through the lowlands where the Canal 

 crosses the Isthmus, it appears again on Cerro Azul. Beyond, they 

 are at present recorded on Cerro Pirre and on the slopes of Cerro 

 Tacarcuna. While they are most common in the mountain forest, 

 where they range to 1750 meters in western Chiriqui, they are found 

 also at lower elevations in this western area. Bangs (Auk, 1901, 

 p. 365) recorded four taken at Divala, Chiriqui, by W. W. Brown, 

 Jr., in 1900, and Salvin (Proc. Zool. Soc. London, 1870, p. 195) 

 received specimens collected by Arce at Bugaba, Chiriqui, and (idem, 

 1867, p. 144) at Santiago, Veraguas. There are two, male and female, 

 in the American Museum of Natural History from Calovevora, 

 northern Veraguas, on the Caribbean side, collected by Benson and 

 GalTney August 12 and 25, 1926. 



On March 17, 1957, in a small tract of virgin forest, about 5 miles 

 southwest of Pedasi, Los Santos, in the southern end of the Azuero 

 Peninsula, I secured a single female, the only one seen. As further 



