NO. 7 ll.OCKS OF NEOTROPICAL BIRDS — MOYNIHAN 39 



tanagers, 8 thick-billed euphonias, 16 streaked saltators, and n buff- 

 throated saltators in the Frijoles area during observations between 

 July 7 and August 16. 



Most of these species were probably almost equally abundant during 

 both series of observations at Frijoles. The only obvious exceptions 

 were blue tanagers and thick-billed euphonias. They were appreci- 



Table 42. — Interspecific contact fights among tanagers, honey creepers, and 

 finches observed near Gamboa and Frijoles 



(No warblers were seen to be involved in interspecific contact fights in either 

 area.) 



No. of 

 cases seen More aggressive species Less aggressive specie; 



i Plain-colored tanager Variable seedeater 



1 Palm tanager Social flycatcher 



3 Blue tanager Palm tanager 



1 do. White-lined tanager 



1 White-lined tanager Crimson-backed tanager 



1 Blue-black grassquit Crimson-backed tanager 



1 Clay-colored thrush Crimson-backed tanager 



1 Rusty-margined flycatcher Yellow-crowned euphonia 



Table 43. — Intraspecific contact fights observed on Barro Colorado Island and 



near Gamboa and Frijoles 



Only fights within species of the blue and green tanager and honeycreeper 

 alliance are shown. 



Species No. 



Plain-colored tanager 9 



Palm tanager 6 



Blue tanager 10 



Green honeycreeper 1 



Red-legged blue honeycreeper 1 



Blue dacnis 1 



Crimson-backed tanager I 



Bananaquit IS 



Buff -throated saltator 2 



ably less abundant during the earlier periods of observation, between 

 November 30 and January 19, than during the later periods. 



These estimates may be too high; but there were certainly many 

 more birds in the areas at Gamboa and Frijoles where observations 

 were made than in the clearing on Barro Colorado Island. This was 

 partly a reflection of the fact that the Gamboa and Frijoles areas 

 were much larger than the clearing on Barro Colorado. 



