Per Birds of the World, the male white-shouldered tanager is black with white shoulders. The female has an olive-green back, yellow belly, gray head and whitish throat. 
I saw one white-shouldered tanager male while staying at Montezuma Rainforest Lodge in Colombia while hiking up the dirt road into Tatama NNP. 
|  | 
| The white shoulder patch is barely visible. | 
They are found from Honduras down to mid-South America, as far south as Ecuador and southern Brazil.
|  | 
| White-shouldered tanager range from Wikipedia. | 

 
 
That's a pretty difficult ID from the photos you have.
ReplyDelete