Icterus, Brisson, R. A. 1760.—Gray, Genera.
Xanthornus, Cuvier, Leç. Anat. Comp. 1800.—Gray, Genera.
Pendulinus, Vieillot, Analyse, 1816.
Yphantes, Vieillot, Analyse, 1816.—Gray, Genera.
Gen. Char. Bill slender, elongated, as long as the head, generally a little decurved, and very acute. Tarsi not longer than the middle toe, nor than the head; claws short, much curved; outer lateral toe a little longer than the inner, reaching a little beyond base of middle toe. Feet adapted for perching. Tail rounded or graduated. Prevailing colors yellow or orange, and black.
The species of this subfamily are all as strikingly characterized by
diversity and brilliancy of plumage as the others are (with few exceptions) for their uniform sombre black, scarcely relieved by other colors. Of the four genera of this subfamily, recognized by Gray, all but Cacicus are well represented in the United States. This differs from all the rest in having the culmen widened and much depressed towards the base, where it advances in a crescent on the forehead, separating the frontal plumes. In the other genera the culmen advances somewhat on the forehead, but it is in a narrow acute point, and not dilated.
Icterus bullocki.
6721
In studying the North American Orioles we have found it exceedingly difficult to arrange them in any sharply defined sections, as whatever characters be taken as the basis of classification, the other features will not correspond. Thus, species with the bill of the same proportions and amount of curvature differ in the shape and graduation of the tail, while tails of the same form are accompanied by entirely dissimilar bills and wings. The bill is sometimes much attenuated and decurved, as in I. cucullatus, while in melanocephalus and baltimore it is stouter and straighter. The tail is usually much graduated; in I. baltimore and bullocki it is only moderately rounded. These last-mentioned species constitute the genus Hyphantes. Many of the species have a naked space round the eye, very evident in I. vulgaris, less so in melanocephalus. I. vulgaris is peculiar in having the feathers of the throat pointed and lanceolate, as in the ravens.