268 



BIRDS OF THE REPUBLIC OF PANAMA PART 4 



ern coasts of the Azuero Peninsula. Considering that, with the possible 

 exception of birds from Isla Bolanos, mentioned earlier, none of the 

 island populations of Yellow Warblers in Panama have differentiated 

 from those of the mainland, it is rather surprising to find that those of 

 Isla Iguana are so distinct. Even in the field their more greenish colora- 

 tion is noticeable. 



The fauna of Isla Iguana is dominated by a great nesting colony of 

 Magnificent Frigatebrids (Fregata magnificats) interspersed with 

 Brown Pelicans (Pelecanus occidentalism . During my visit in February 

 1957, the Yellow Warbler was the only abundant small bird on the is- 

 land, where it ranged everywhere, from the tall bunch grass above the 

 rocky shore to the scrub forest inland. I saw them hopping about on 

 bare rocks above the high-tide mark in early morning, and 15 or 20 

 ranged about the outdoor kitchen near the house, where they came out 

 familiarly on low perches, as well as higher among the leaves of the 

 trees. In the forest I found them often examining tufts of leaves almost 

 among the frigatebirds perched in the branches. Many were in pairs, 

 and males sang occasionally, though they were not breeding. 



DENDROICA PETECHIA ERITHACHORIDES Baird 



Dendroica erihtachorides [sic] Baird, 1858, in Baird, Cassin, and Lawrence, Rept. 

 Expl. Surv. R.R. Pacific, 9, p. 283. (Cartagena, Colombia.) 



Characters.- — Males with rufous rather than hazel on head and throat, 

 where it is less extensive than in other races; streaks on chest wider. 

 Measurements. — Males (8 from Bocas del Toro), wing 63.0-69.5 



(66.5) , tail 48.7-56.1 (51.5), culmen from base 11.5-14.7 (13.2), tar- 

 sus 19.2-20.7 (19.3) mm. 



Females (6 from Bocas del Toro and Province of Panama), wing 

 60.0-65.7 (63.6), tail 44.3-52.9 (49.1), culmen from base 12.0-13.7 



(12.6) , tarsus 18.6-21.4 (19.8) mm. 



Resident. Common on the entire Caribbean coast of Panama from 

 Almirante, Bocas del Toro, west beyond the border to Magdalena, Co- 

 lombia. On Isla Escudo de Veraguas, I found Yellow Warblers scat- 

 tered through the taller trees, where they were fairly common, though 

 each of the 4 I took on a visit in March 1958 appeared to be alone. On 

 Escudo this species was not restricted to the limited growths of man- 

 groves found near the sea, as is the case on the mainland, but ranged 

 throughout the forest growth, as appears to be its regular habit when 

 found on small islands. 



This series from Escudo and Almirante Bay agree fully with type 



