Sir Michael Costa was the conductor 1846-1854, and from his acceptance of that high pitch the fork became known as Costa's, and its inception was attributed to him, though on insufficient grounds.
Negotiations were soon opened which quickly led to the resignation of Costa, and the return of the insurgents to their homes.
In 1462 de Sintra returned with another Portuguese captain, Sueiro da Costa, and penetrated as far as Cape Palmas and the Cavalla river.
Southern examples from Costa Rica and Veragua have the tail-coverts much narrower, and have been considered to form a distinct species, P. costaricensis.
In this position the outer margin of the wing is the costa, the inner the dorsum, and the hind-margin the termen.