A History of North American Birds, Land Birds. Volume 2. Robert Ridgway. Читать онлайн. Newlib. NEWLIB.NET

Автор: Robert Ridgway
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Like the Cañon Finch, this species is said to live almost constantly on the ground, but appears rather more gregarious, especially in winter.

      About the first of April Dr. Cooper met with many of their nests. They were generally built in thorny shrubs, and were composed of a flooring of coarse twigs, or of green herbs, and strongly interwoven with strips of bark, grass, and leaves. One bird had taken advantage of the recent introduction of horses into the valley to obtain a lining of horse-hair for its nest. The eggs were in all cases only three, bluish-white, with brown spots and streaks in a ring near the large end, quite variable in number, and measuring one inch by .70. One of the nests was in a low mesquite-tree, another in a dense cluster of dead twigs hanging from a cottonwood. The time required for hatching was twelve or thirteen days, and in a fortnight more the young left the nest. Dr. Cooper found nests with eggs as late as May 25, and had no doubt that they raise two or more broods in a season. He adds that the song of the male, throughout April and May, is precisely like that of P. fuscus, and also reminded him of the notes of P. oregonus and of the eastern Black-throated Bunting (Euspiza americana).

      Dr. Coues has kindly supplied me with the following interesting sketch of this species, as observed by him in Arizona:—

      “This species appears to have a remarkably restricted geographical distribution. I never saw it at Fort Whipple, but on the Colorado bottom in the same latitude, and thence along the river to Fort Yuma, I found it to be one of the most abundant and characteristic birds of all. At the time I observed it, in September, it was generally in small flocks, and proved rather difficult to capture, partly because the dense underbrush it inhabited was almost impenetrable, and partly on account of its natural timidity. Everything along the river-bottom is scorched with the heat, and the dry dead twigs constantly snap at a touch, with such noise that it is almost impossible to force a passage through the underbrush without alarming all its inmates. The bird occurs everywhere along the river-side, but is particularly numerous on the patches of mesquite, and the extensive areas grown up to young willows and cottonwoods, and the arrowwood (Tessaria borealis). Its ordinary cry of alarm, if not its call-note, is a loud, clear chirp, very different from the mewing sound made under similar circumstances by its congener, the P. megalonyx. The latter, as is well known, is almost exactly like that of a Catbird. I never heard the song of this bird, which appears to sing only during the breeding-season, but Dr. Cooper says it resembles that of the western Black Pipilos, and I can indorse his observation, that this is curiously like the monotonous notes of the Black-throated Bunting,—Chip, chip, chee-chee-chee; the first two syllables deliberately pronounced, the others more rapidly enunciated, with greater emphasis. The associates of this species seem to be few, if indeed they be not confined to the P. mesoleucus, a very near ally. The moult seems to me unusually protracted, as many September specimens were still in poor plumage.

      “Excepting my experience with this bird on the Colorado, I only met with it on the Hassayampa, a small stream a few miles from Fort Whipple, yet in a somewhat different region, across a slight mountain-ridge, lower and warmer. Two specimens were secured, adult and young, the first week in August.”

      Dr. Coues, on his way from Arizona to the Pacific (Ibis, 1866, p. 261), mentions that he was often startled by the loud, clear, sharp chirp of this bird, which, though fringilline in character, is more than usually powerful, and is its alarm-note. Everywhere in the Colorado Valley this was one of the most characteristic birds. Fort Yuma seemed to be its head-quarters. It is, like all its congeners, a retiring species, and keeps perseveringly in the almost impenetrable undergrowth. It is said to be more decidedly gregarious than most of the genus, often collecting in flocks of a dozen or more, wandering restlessly, yet in a cautious manner, through the thickets.

      A nest with eggs, procured at Fort Mohave by Dr. Cooper, is in the Smithsonian Collection (No. 7,276). The egg measures .93 by .70 of an inch, is obovate in shape, being much rounded at the smaller end. Its ground-color is a dull white, without any perceptible tinge of blue,—though possibly bluish when fresh,—with heavy dots and occasional delicate, hair-like, zigzag markings of black. These markings are wholly confined to the larger end. One of the eggs has these markings much finer, consisting of minute dots, more dense, and upon the apex of the larger end. The nest is loosely built and very bulky. Its external diameter is about six inches, and its depth three. The cavity is three inches wide and two deep. It is constructed almost entirely of strips of inner bark, the coarser, ribbon-like pieces being used on the outer portion, and the finer shreds composing the lining. Externally are also a few sticks about one quarter of an inch in diameter.

SECTION IVCrown rufous; body above, olive-green Pipilo chlorurus, BairdGREEN-TAILED BUNTING; BLANDING’S FINCH

      Fringilla chlorura, (Townsend,) Aud. Orn. Biog. V, 1839, 336 (Young). Zonotrichia chlorura, Gambel, J. A. N. Sc. Ph. 2d Series, I, 1847, 51. Embernagra chlorura, Bonap. Conspectus, 1850, 483. Fringilla blandingiana, Gambel, Pr. A. N. Sc. Ph. I, April, 1843, 260. Embernagra blandingiana, Cassin, Illus. I, III, 1853, 70, pl. xii. Pipilo rufipileus, Lafresnaye, Rev. Zoöl. XI, June, 1848, 176.—Bp. Conspectus, 1850, 487. Kieneria rufipileus, Bon. Comptes Rendus, XL, 1855, 356. Pipilo chlorura, Baird, Birds N. Am., 1858, 519.—Heerm. X, c, 15.—Cooper, Orn. Cal. 1, 248.

      Sp. Char. Above dull grayish olive-green. Crown uniform chestnut. Forehead with superciliary stripe, and sides of the head and neck, the upper part of the breast and sides of the body, bluish-ash. Chin and upper part of throat abruptly defined white, the former margined by dusky, above which is a short white maxillary stripe. Under tail-coverts and sides of body behind brownish-yellow. Tail-feathers generally, and exterior of wings, bright olive-green, the edge and under surface of the wings bright greenish-yellow; edge of first primary white. First quill longer than eighth, fourth longest. Length, about 7 inches; wing, 3.20; tail, 3.65.

      Hab. Whole of the Middle Province, including the Rocky Mountains and eastern slope of the Sierra Nevada; north to beyond the 40th parallel; south to Mexico.

      In this species the wing is considerably rounded, the tertials considerably shorter than the primaries, and not exceeding the secondaries; the fourth quill longest, the first shorter than the sixth, the second and fifth quills considerably longer than the rest. The tail is long and considerably graduated, the outer feather half an inch shortest; the feathers broad and obtusely pointed, the corners rounded.

Illustration: Pipilo chlorurus

      Pipilo chlorurus.

      38493

      The extent of the chestnut of the crown varies somewhat; more extended probably in the males. The region on the side of the head, adjoining the nostrils, is whitish; the small feathers under the eye are spotted with the same. The posterior outline of the ash of the breast is much less sharply defined than the anterior.

      Specimens vary in the brightness of the olive above, which is never as pure as that of the wings and tail. The olive of the tail, too, is darker than that of the wings.

Illustration: Pipilo chlorurus

      Pipilo chlorurus.

      A very young bird (1,896) has the whole under parts dull white, streaked and spotted on the sides of the throat and on the breast with dark brown. The crown and back are also thickly spotted. In 5,734 the ash of the breast has made its appearance; the middle of the belly is white, spotted; the chin white, encircled by spots. The spots above are restricted to near the head, and there is a small central patch of chestnut on the crown.

      No. 1,896 is the original “Green-tailed Sparrow” killed July 12, 1834, by Townsend, and described in an extract of a letter to Mr. Audubon, published page 336 of Vol. V. of the Ornithological Biography.

      Habits. Dr. Kennerly, who procured a specimen of this bird at San Elizario, Tex., December 16, states that it was obtained with some difficulty. For several successive days it was found in the same place, occupying a small clump of very thick weeds. When aroused, which was only accomplished with some effort, its flight was short, rapid, and decidedly irregular. Its motions on the ground were very awkward. This species was found by Mr. Ridgway very generally distributed throughout