Euphonias (Tanagra) are small, brightly colored tanagers with short bills and tails. The males are usually a dark, steel-blue above with bright yellow coloration on the forehead, forecrown and under parts. The extent of the yellow varies in the different species, of which four are recorded in the Canal Zone. The Thick-billed Euphonia (T. Zuniirostris) has a heavier bill than the others and differs further in having entirely yellow under parts, including the throat. The female is a yellowish olive green above and a clearer yellow below. This species is known to range through much of tropical South America north to Costa Rica. In Panama, it is often found at the edge of jungle. The natives call it “pica-gordo,” which, means “thick-bill.” The birds which are frequently captured and caged apparently survive on fruits, although wild euphonias are believed to feed chiefly on various species of tropical mistletoe. Apparently the only published data on the actual breeding of the Thick-billed Euphonia are contained in a brief note by Carriker from Santa Marta, Colombia (Todd and Carriker, Ann. Carnegie Mus., 14, 1922:497) ; he describes the appearance of eggs and nest, which he indicates are usually placed in a crevice on the side of an overgrown earth bank. Wyatt (Ibis, 13, 187 1: 324)) also in Colombia, reports seeing on March 7 a pair of these euphonias apparently looking for a nest site in the thatch of a shed. This species has been found breeding regularly in the small town of Pedro Miguel, which is situated beside the Pacific locks of that name, on the eastern bank of the Panama Canal. The continental divide is only two and a half miles distant at Gold Hill, which overlooks historic Culebra or Gaillard Cut. Many low hills, some grass-covered and some jungle-clad, bring various forms of wildlife to the very edge of the landscaped areas about the residences. A narrow river and small lake, on the south and east, provides additional favored habitat, but it was not until we had moved from the lakeside to a cottage near the foot of Cerro Luisa that we saw our first pair of wild euphonias. They were in a small tree near our garage.