104 BIRDS OF THE REPUBLIC OF PANAMA PART 4 



sides being dark like intermedins but with the central undersurface 

 nearly clear white as in inquietus. The wrens, not common in this area, 

 should be examined from within a kilometer or so of the boundary, as 

 they may prove to be the subspecies intermedins. Griscom ascribed 

 birds from extreme northwestern Panama in Bocas del Toro (Almi- 

 rante, Chiriquito) to intermedins, but they are here included in 

 inquietus. 



Birds weighed by Burton (Bull. Brit. Orn. Club, 1975, p. 85) and 

 Strauch (Bull. Brit. Orn. Club, 1977, p. 64) weighed from 14.0 to 

 15.7 g. 



Nests with eggs or young have been reported in Panama in every 

 month from January through October, according to Eisenmann, but 

 egg laying may occasionally occur in the other two months. On Feb- 

 ruary 5, 1960, he saw a stub-tailed fledgling accompanying its parent. 



The bubbling, presumably territorial, song strongly resembles that 

 of T. a. aedon of eastern United States, but there is another musical 

 vocalization commonly given even during the months November to 

 February, when the bubbling song is infrequently heard. Eisenmann 

 has never heard nominate aedon give a call resembling it. The vocaliza- 

 tion is a loud, clear, rapidly repeated chwee-chwee-chwee and so on, all 

 on one pitch, sometimes more like chew-chew-chew. Occasionally, the 

 same bird will shift from this vocalization to the irregular, much more 

 varied bubbling song. Eisenmann has also heard in Panama scolding 

 and chattering like churkat and churr-cheechee. 



On Barro Colorado Island this species, when present, comes to pick 

 off window screens or the pavements insects that were killed when at- 

 tracted to lights. Eisenmann has seen House Wrens walking, as well as 

 hopping, on the ground without any clumsiness. 



Although recorded from Bocas del Toro, it is, or was, apparently 

 rather rare there, for on three trips to the Almirante Bay area (the last 

 in 1965) Eisenmann failed to observe it. 



TROGLODYTES AEDON CARYCHROUS Wetmore 



Troglodytes aedon carychrous Wetmore, Smiths. Misc. Coll., vol. 134, no. 9, July 

 8, 1957, p. 76. (Isla Coiba, Panama.) 



Characters. — Similar to T. a. inquietus but much brighter brown 

 throughout; upper surface definitely deeper brown; underneath with 

 sides and flanks darker brown, this color in some covering the entire 

 surface. Others are whiter on throat and center of breast. 



In its definitely brighter coloration this bird of Coiba is distinct from 



