178 BIRDS OF THE REPUBLIC OF PANAMA PART 3 



HERPSILOCHMUS RUFOMARGINATUS EXIGUUS Nelson: 

 Rufous-winged Ant-wren, Hormiguerito Alirufo 



Hcrpsilochimis rufoinarginatus cxiguus Nelson, Smithsonian Misc. Coll., vol. 60, 

 no. 3, September 24 (27), 1912, p. 11. (Cana, Cerro Pirre, 1050 meters 

 elevation, Darien, Panama.) 



Small, slender ; wing prominently rtifous, with shoulder black. 



Description. — Length 100-110 mm. Adult male, crown, hindneck, 

 broad line down back and rump black, the back and rump bordered by 

 dark gray, which continues on upper tail coverts ; outer scapulars 

 edged with white ; wing coverts black, the middle and greater series 

 tipped with white to form two prominent wing bars ; tertials and 

 inner primaries edged with white, primaries and secondaries bordered 

 widely with rufous on outer margins forming a prominent band ; 

 rectrices black, the central ones tipped with white, the two outer 

 feathers edged and tipped broadly with white ; a prominent white 

 superciliary streak ; broad line from the lores through eye, black ; 

 side of head and most of upper foreneck white ; lower foreneck, 

 breast and abdomen light yellow ; under tail coverts white ; under 

 wing coverts, edge of wing, and inner margins of wing feathers white. 



Adult female, crown and hindneck dull rufous ; back and rump 

 dull brownish gray, paler posteriorly on the upper tail coverts ; 

 streak through eye duller rufous than crown ; otherwise as in male. 



Measurements. — Males (5 from Darien and northwestern Co- 

 lombia), wing 48.2-51.7 (49.6), tail 36.0-38.3 (37.1), culmen from 

 base 15.5-16.5 (16.0), tarsus 18.0-19.0 (18.6) mm. 



Female (1 from Darien), wing 48.4, tail 36.8, culmen from base 

 16.1, tarsus 18.1 mm. 



Resident. Rare in forested areas in Darien ; recorded from Cerro 

 Sapo. Cerro Pirre, and the lower Tuira-Chucunaque Valley. 



This interesting race was named from two specimens collected in 

 1912 by E. A. Goldman, a male (the type) on Cerro Pirre, above 

 Cana, June 6, and a female at Boca de Cupe on the lower Rio Tuira, 

 June 18. Griscom secured one and saw another at Garachine in 

 February 1927, and the George Vanderbilt Expedition collected five 

 at Garachine and Cerro Sapo (at 900 meters) in April and May 1941. 



Near the mouth of the Rio Tuquesa on the Rio Chucunaque, on 

 March 29, 1959, I found a male with a mixed group of small forest 

 birds that searched the crown of a fairly high tree in open forest. In 

 its movements this bird resembled its companion Myrmotherulas 

 fluttering from one btinch of leaves to another, and then, on alight- 

 ing, remaining motionless for a minute or two under cover before 



