FAMILY FORMICARIIDAE 1 53 



Characters. — Darker above than saturatus; crown more rufous 

 than back ; under surface averaging darker, with foreneck and upper 

 breast dull ochraceous-buff. 



In both sexes, the iris is auburn ; cutting edge of maxilla and 

 mandible light neutral gray ; rest of maxilla fuscous-black ; tarsus and 

 toes dull light green to greenish neutral gray ; claws neutral gray. 



Measurements. — Males (10 from Province of Panama and 

 Darien), wing 66.5-69.2 (67.6), tail 47.2-53.7 (51.4), culmen from 

 base 19.3-21.0 (20.1, average of 9), tarsus 20.0-21.2 (20.2) mm. 



Females (10 from Veraguas, Canal Zone, Province of Panama, 

 and Darien), wing 63.6-69.3 (65.8), tail 48.4-52.5 (50.3), culmen 

 from base 18.5-21.6 (20.5), tarsus 20.0-21.2 (20.3) mm. 



Resident. Found locally in small number in the Tropical and lower 

 Subtropical zones ; on the Pacific slope recorded at Santa Fe, Calobre, 

 Veraguas ; Cerro Campana, Cerro Azul, and Cerro Chucanti, 

 Province of Panama; and on Cerro Pirre and Cerro Tacarcuna, 

 Darien ; on the Caribbean side, on the Rio Calovevora, Veraguas ; 

 the Canal Zone ; the Chagres Valley, eastern Province of Panama ; 

 and eastern San Bias. 



In the U.S. National Museum there is a specimen received from 

 Salvin collected by Arce at Calobre, and in the American Museum 

 of Natural History a pair taken by Benson at Santa Fe, Veraguas, 

 and others from Rio Calovevora on the Caribbean side. 



On the southern face of Cerro Campana, at 850 meters elevation, 

 I shot a female March 13, 1951, from a tall tree top in heavy forest, 

 when it was in company with a little group of tanagers and warblers. 

 E. A. Goldman secured a female on the Rio Indio near Gatun, Canal 

 Zone, February 10, and a male March 23 at 300 meters in Cerro 

 Azul, Panama, both in 1911. In March 1950, we collected two pairs 

 along the base of Cerro Chucanti, where they ranged to above 500 

 meters. Here also they were in company with traveling flocks of other 

 small birds. On the Rio Pequeni near the Candelaria Hydrographic 

 Station on March 6, 1961, I found a group of half a dozen of this 

 species in tangled vines in a small, thick-leaved tree beside a quebrada 

 in heavy forest. Here one would move quickly and then pause mo- 

 tionless, so that they were seen at rest only with difficulty. They were 

 in company with a few other small forest birds that were somewhat 

 more active. I secured one also near Armila, in eastern San Bias, 

 and Wedel also collected a pair from this area near Perme. The race 

 was described from a pair taken by Goldman near Cana on Cerro 

 Pirre in June 1912. Benson collected others here in 1928, and Bar- 

 bour and Brooks secured a pair on Cerro Sapo, Darien, April 20 and 



