FAMILY THRAUPIDAE 



477 



McLeannan collected the type, Barro Colorado Island (Eisenmann, 

 Smiths. Misc. Coll., vol. 117, no. 5, 1952, p. 56), Cerro Santa Rita, 

 and in the upper Chagres Valley, where I secured a female on the Rio 

 Boqueron, and in San Bias at Puerto Obaldia (Griscom, Bull. Mus. 

 Comp. Zool., vol. 72, 1932, p. 371). There is one report from the 

 Pacific slope of Veraguas — a bird seen June 14-16, 1977, by J. Wall 

 and D. Wilcove above Santa Fe (Ridgely, in litt.). Elsewhere on the 

 Pacific slope, I collected a male in the forest of Bajo Grande on the 

 upper course of the Rio Pacora, in the Cerro Azul, on March 23, 1949. 

 It also occurs in the lowlands of the Bayano Valley, where on Decem- 

 ber 29, 1974, Ridgely {in litt.) saw a pair at Maje; they were carrying 

 nesting material to a high, epiphyte-covered branch 20 m over the 

 ground. 



The bird taken on the Boqueron was found in second growth at the 

 edge of the heavy forest, in company with a group of Chlorothraupis 

 olivacea. Ridgely has seen this species in flocks with Caryothraustes 

 and Tachyphonus delattrii. 



HETEROSPINGUS XANTHOPYGIUS XANTHOPYGIUS (Lawrence) 



Tachyphonus xanthopygius P. L. Sclater, 1855, Proc. Zool. Soc. London, 22 

 (1854), p. 158, pi. 69. (Bogota collections.) 



Characters.-— Male plumage as described above, entirely different 

 from male rubrifrons; female differs from both sexes of rubrifrons by 

 its larger size and less yellow on undertail coverts. 



A female collected at Pucro, Darien, on February 8, 1964, had the 

 iris dark red; thickened eyelid fuscous-black; bill fuscous-black; tarsus 

 and toes dark neutral gray; claws dusky neutral gray. 



Measurements. — Males (10 from Darien and Colombia), wing 88.1- 

 92.0 (90.0), tail 63.9-69.2 (66.9), culmen from base 17.1-20.7 (19.5), 

 tarsus 18.1-21.2 (20.2) mm. 



Females (7 from Darien and Colombia), wing 83.3-90.2 (86.0), tail 

 60.3-68.8 (64.4), culmen from base 17.4-20.2 (18.7), tarsus 18.6-20.7 

 (19.8) mm. 



Resident. Probably not uncommon, but difficult to see or collect in 

 eastern Darien, where it has been taken at Cana (550 m) by E. A. Gold- 

 man, at El Real on the Rio Tuira by W. B. Richardson, and by me at 

 Pucro and the mouth of the Rio Imamado on the Rio Jaque. Barbour 

 took a bird in nestling plumage on the Rio San Antonio on the slopes of 

 Cerro Sapo on April 25, 1922 (Bangs and Barbour, Bull. Mus. Comp. 



