DESCRIPTION AND TECHNICAL OBSERVATIONS.

Genus Haliaëtus. Savigny, Description of Egypt, Zoology, p. 85, (1809.)

Size, large. Bill, strong, straight at the base, hooked and very sharp at the point, sides of the bill compressed, margin of upper mandible, slightly festooned. Wings rather long and pointed, formed for rapid and vigorous flight; tail moderate. Tarsi short, very strong, and with the toes, covered with scales; claws very strong, curved and sharp. About ten or twelve species known, which are scattered throughout the surface of the globe.

Haliaëtus pelagicus. (Pallas.) Aquila pelagica. Pallas, Zoographia Rosso-Asiatica, I. p. 343, (St. Petersburg, 1811, Quarto.) “Aquila marina. Steller, MSS.” Pallas ut supra. Falco Imperator. Kittlitz, Kupfertafeln zur naturg. der Vogel pt. I. p. 3, pl. 2, (Frankfurt, 1832.) Falco leucopterus. Temminck. Pl. col. I. pl. 489. Haliaëtus pelagicus. (Pallas.) Temm. & Schl. Fauna Japonica, Aves p. 10, pl. 4. Haliaëtus imperator. (Kittlitz.) Bruch in Isis XXV. p. 1102, (1832.)

Form. Very large and powerful, tail rather short, wedge shaped, the middle feathers being nearly four inches longer than the outer, which are shortest, all of the fourteen feathers somewhat pointed, but the central four lanceolate.

Bill strong, much compressed, very wide laterally or in altitude; upper mandible with a slight festoon; gape rather wide, extending so far back as to be immediately under the eye; cere large, in which at the distance of nearly an inch from the frontal feathers, the nostrils are obliquely inserted, large loral space bare, or with a few scattered bristles.

Wings rather short, third and fourth quills longest, but with the fifth little shorter; secondaries abruptly acuminated, and some of them with their shafts produced into filaments or thread-like appendages, exserted from the tips of the feathers; secondaries and greater coverts very broad and strong.

Legs and feet rather short, but strong; tarsus feathered below the joint for half its length, bare lower portion, with about five large frontal scales immediately succeeding the feathers; then to the toes in common with its entire posterior part, covered with numerous scales, which are rounded or hexagonal: the latter shape most readily observed behind; toes, with broad frontal scales; claws large.

Feathers of the head and neck, narrow and pointed, or acuminated; those on the breast and back, somewhat lanceolate, but broad, and sometimes abruptly pointed. Tail coverts, both above and below, ample—extending to half the length of the tail.

Dimensions of a skin from Behrings Straits. Total length from tip of bill to end of tail, about 3 feet 8 inches; wing, 2 feet 2 inches; tail, 1 foot 4 inches; bill, from tip of upper mandible to angle of the mouth, 3¾ inches; width of bill, laterally, at point of insertion of the nostrils, full 1¾ inches.

Colours. Female, nearly adult? Tail, white, the two external feathers having their outer webs, brownish black, mottled with white, and other feathers slightly spotted with the same brownish black. Entire other parts, above and below, very dark brownish black; lighter on the head and neck, and on which parts every feather is lighter in the middle.

Primary quills, shining black; secondaries and tertiaries, white at their bases, and brownish black at their ends; greater coverts narrowly tipped with brownish white; lesser coverts whitish on both margins, especially at their bases, terminated with brownish. Rump with the plumage white at the base.

Bill, yellow, (in skin,) feet, yellow.

Adult, as described by authors cited above. Large frontal space, commencing at the base of bill, white, which is also the colour of the greater wing coverts, the abdomen, and the tail. All other parts of the plumage blackish brown; bill, cere, legs and feet, yellow.

Hab. Russian possessions in Asia and America. Spec. in Mus. Acad. Philada.

Obs. The largest of all known Eagles, and nearly related to H. Washingtonii (Aud.). It differs from the latter, as described by Audubon, in being larger generally, but has the wing shorter and the tail wedge shaped, and containing fourteen feathers. We suppose H. Washingtonii to be the young of a closely allied species, and that both are strictly congeneric with H. leucocephalus, H. albicilla, H. vocifer, and others known as Fishing Eagles.

Plate 7
The Ground Wren
Chamaea fasciata (Gambel)

CHAMÆA FASCIATA.—(Gambel.)
The Ground Wren.
PLATE VII.—Adult Male.

This little bird was discovered in California, by William Gambel, M. D., an enthusiastic and highly talented young naturalist, who, during an overland journey across the North American Continent, made many discoveries, and added much valuable information to several departments of Natural History, and we regret to say, whose recent death, during a second expedition of the same character, occurring, as it did, so early, and thus terminating so prematurely a life of such promise, is to be deplored as a loss to science and to his country.

Dr. Gambel’s account of this bird in the Proceedings of the Academy of Natural Sciences of Philadelphia, II. p. 265, and in the Journal of the same society, quarto, I. p. 34, which is the first and, as yet, the most satisfactory, is as follows: “For several months before discovering the bird, I was attracted in the fields of dead mustard stalks, the weedy margins of streams, low thickets and bushy places, by a continued loud, crepitant, grating scold, which I took for that of a species of Wren, but at last found it to proceed from this Wren-tit, if it may be so called. It was difficult to be seen, and kept in such places as I have described, close to the ground; eluding pursuit by diving into the thickest bunches of weeds and tall grass, or tangled bushes, and uttering its grating Wren-like notes whenever approached. But if quietly, watched, it may be seen, when searching for insects, mounting the twigs and dried stalks of grass sideways, jerking its long tail, and holding it erect like a Wren, which, with its short wings in such a position, it much resembles.

“Sometimes it utters a slow, monotonous, singing chicadee note, like pee, pee, pee, pee, peep; at other times its notes are varied, and a slow whistling continued pwit, pwit, pwit, pwit, is heard. Again, in pleasant weather, towards spring, I have heard individuals answering each other, singing in a less solemn strain not unlike sparrows, a lively pit, pit, pit, tr, r, r, r, r, r, but, if disturbed, they at once resumed their usual scold.”

Mr. Bell, whose collection contained numerous specimens of this bird, found it abundant in the neighbourhood of San Francisco, and has kindly allowed us to use his memoranda: “I observed this bird in bushes and briers every where along the roads, and in brush heaps on lands which had been recently cleared, though it appeared rather to prefer damp places. It was very pert, and not easily frightened, and as it moved about with its tail erect, uttered several rather peevish notes, unlike those of any other bird with which I am acquainted.

“The white iris of this bird, when in its native haunts, is quite readily observed, and with its manners and the localities which it frequents, reminded me, in some measure, of the white-eyed Vireo, (V. noveboracensis.) Its skin is unusually strong for such a small bird, and it has a remarkable development of the muscles of the thighs, and, in fact, unusual strength and firmness of the muscular system generally.”