6lO BIRDS OF THE REPUBLIC OF PANAMA PART 4 



wing 76.0-81.0 (78.6), tail 68.1-75.0 (72.0), oilmen from base 13.9- 

 14.9 (14.3), tarsus 25.6-27.1 (26.3) mm. 



Females (10 from Volcan de Chiriqui and Costa Rica), wing 70.8- 

 77.6 (74.7), tail 64.9-71.8 (68.3), culmen from base 13.8-15.7 (14.6), 

 tarsus 25.2-27.8 (26.9) mm. 



Figure 47. — Volcano Junco, Junco del Volcan, J unco vulcani. 



Resident. Found only on Volcan de Chiriqui, Chiriqui, and on the 

 high peaks of Costa Rica. On Volcan de Chiriqui, it is common at and 

 above timberline; I collected some at 2685 and 2700 m, but it is usually 

 not encountered below 3000 m. The Volcano Junco is generally found 

 singly or in pairs accompanied by young birds. It inhabits openings 

 with tangles of bushes and scrub, and sometimes rises into trees when 

 they are present. It forages on the ground, where it hops and runs. 

 Slud (Bull. Amer. Mus. Nat. Hist., vol. 128, 1964, p. 389) describes 

 the song as "a somewhat involved set of about 10 notes followed by a 

 variable, strongly undulant trill or warble." It also has various chirp- 

 ing and twittering notes. In the series that W. W. Brown, Jr., (Bangs, 

 Proc. New England Zool. Club, vol. 3, 1992, p. 70) collected on Volcan 

 de Chiriqui in May and June 1901 were young in nestling plumage. 



F. G. Stiles found a nest with two eggs in Costa Rica that is now in 

 the collection of the Western Foundation of Vertebrate Zoology. The 

 nest was a cup of grass lined with animal hair and thistle floss. It was 

 set in a niche in a rocky embankment overgrown with moss, the moss 

 overhanging and forming a roof for the nest. The outside was some- 



