A History of North American Birds, Land Birds. Volume 2. Robert Ridgway

Чтение книги онлайн.

СКАЧАТЬ plumage, those beneath lack the central black, being wholly rufous; such is the case with the type. In summer, however, they are frequently entirely black, the external rufous having entirely disappeared. As in heermanni, the rump is immaculate. The young bird differs as does the adult, though the resemblance to those of melodia and heermanni is more close than in the adult. The very narrow bill and long tail are the most characteristic features of form.

      Habits. In habits and song, Dr. Cooper can find no appreciable differences between this variety and its nearest allies. He states that its nest, which he found in a willow thicket, was composed of bark and fine twigs and grass, and lined with hair. Its eggs he describes as bluish-white, blotched and streaked with reddish-brown, and as measuring .74 by .55 of an inch.

      Dr. Coues found this species a common and permanent resident in Arizona, and he pronounces its habits, manners, and voice precisely like those of M. melodia. This species, he states, occurs throughout New Mexico, Arizona, and a part of Southern California, and is particularly abundant in the valley of the Colorado.

      Dr. Kennerly observed this species only along Pueblo Creek, in the month of January. It did not confine itself to the open valley, but was often seen among the thick bushes that margined the creek, far up into the Aztec Mountains, where the snow covered the ground. In its habits it resembled the Poospiza belli, being very restless and rapid in its motions, accompanying them with a short chirp, feeding upon the seeds of the weeds that remained uncovered by the snow. Its flight was also rapid and near the earth. The bird being very shy, Dr. Kennerly found it difficult to procure many specimens.

      According to Mr. Ridgway, the Western Song Sparrow is one of the most abundant of the resident species inhabiting the fertile portions of the Great Basin. It principally occupies the willows along the streams, but is also found in tulé sloughs of the river valleys. From a long acquaintance with the Western Song Sparrows, Mr. Ridgway is fully convinced of the propriety of recognizing this as a distinct variety from the eastern M. melodia. In all respects, as to habits, especially in its familiarity, it replaces at the West the well-known Song Sparrow of the East. When first heard, the peculiar measure and delivery of its song at once attracts attention. The precision of style and method of utterance are quite distinct and constant peculiarities. The song, though as pleasing, is not so loud as that of the eastern Song Sparrow, while the measure is very different. He noted the syllables of its song, and found them quite uniform. He expresses the song thus: Cha-cha-cha-cha-cha—wit´—tur´-r-r-r-r-r—tut. The first six syllables as to accent are exactly alike, but with a considerable interval or pause between the first and second notes. The second to the fifth follow in rapid succession, each being uttered with deliberation and distinctness. Then comes a pause between the last “cha” and the “wit,” which is pronounced in a fine metallic tone with a rising inflection, then another pause, and a liquid trill with a falling inflection, the whole terminating abruptly with a very peculiar “tut,” in an entirely different key from the other notes.

      The nests and eggs were found in the Wahsatch Mountains, June 23. The nests were generally among bushes, in willow thickets, along the streams, about a foot from the ground. One of these nests found in a clump of willows, about two feet from the ground and near a stream, is a compact, firmly built nest, in the shape of an inverted dome. It is two and a half inches in height, and about the same in diameter. Externally it is composed of a coarse framework of strips of willow bark firmly bound around. Within is a compactly woven inner nest, composed of straws, mingled and interwoven with horse-hairs. The cavity has a depth and diameter of two inches. The eggs, four in number, measure .85 by .63 of an inch. Their form is a rounded oval, distinctly pointed at one end. They have a greenish-white ground, marked and blotched with splashes of purplish and reddish brown.

Melospiza melodia, var. heermanni, BairdHEERMANN’S SONG SPARROW

      Melospiza heermanni, Baird, Birds N. Am., 1858, 478, pl. 70, f. 1.—Cooper, Orn. Cal. 1, 212.

      Sp. Char. Somewhat like melodia, but darker. The streaks on the back and under parts blacker, broader, more distinct, and scarcely margined with reddish, except in winter plumage. The median stripe on vertex indistinct. General shade of coloration olivaceous-gray rather than rusty. Length, 6.40; wing, 2.56; tail, 3. Bill and legs in size and color most like melodia.

      Hab. Southern California; eastern slope of Sierra Nevada (Carson City), and West Humboldt Mountains, Nev.; Ridgway.

      Of the various races of M. melodia, this one approaches nearest the typical style of the Atlantic region; agreeing with it in thicker bill and shorter tail, as compared with the var. fallax, which occurs between them. It differs from the var. melodia, however, in a more grayish cast to the ground-color of the upper plumage, being olivaceous-gray, rather than reddish; the black dorsal streaks are very much broader than the rusty ones, instead of about equal to them in width, and the edges to the interscapular feathers are not appreciably paler than the prevailing shade, instead of being hoary whitish, in strong contrast. In spring the “bridle” on the side of the throat and the spots on the jugulum have the black of their central portion in excess of their external rufous suffusion; but in autumn the rusty rather predominates; at this season, too, the rusty tints above overspread the whole surface, but the black streaks are left sharply defined. At all seasons, the spots on the jugulum are broader and rather more numerous than in melodia. The young can scarcely be distinguished from those of melodia, but they have the dark streaks on the crown and upper tail-coverts considerably broader.

      Habits. The California Song Sparrow has been named in honor of the late Dr. Heermann, who first obtained specimens of this bird in the Tejon Valley, and mistook them for the Zonotrichia guttata of Gambel (M. rufina), from which they were appreciably different. Whether a distinct species or only a local race, this bird takes the place and is the almost precise counterpart, in most essential respects, of the Song Sparrow of the East. The exact limits of its distribution, both in the migratory season and in that of reproduction, have hardly yet been ascertained. It has been found in California as far north as San Francisco, and to the south and southeast to San Diego and the Mohave River.

      The California Song Sparrow is the characteristic Melospiza in all that portion of the State south of San Francisco. It is found, Dr. Cooper states, in every locality where there are thickets of low bushes and tall weeds, especially in the vicinity of water, and wherever unmolested it comes about the gardens and houses with all the familiarity of the common melodia. The ground, under the shade of plants or bushes, is their usual place of resort. There they diligently search for their food throughout the day, and rarely fly more than a few yards from the place, and remain about their chosen locality from one year’s end to another, being everywhere a resident species. In the spring they are said to perch occasionally on some low bush or tree, and sing a lively and pleasant melody for an hour at a time. Each song, Dr. Cooper remarks, is a complete little stanza of a dozen notes, and is frequently varied or changed entirely for another of similar style, but quite distinct. Although no two birds of this species sing just alike, there is never any difficulty in distinguishing their songs when once heard. There is, he thinks, a similarity of tone and style in the songs of all the species of true Melospiza, which has led other observers to consider them as of only one species, when taken in connection with their other similarities in colors and habits.

      Dr. Cooper found a nest, presumed to belong to this bird, at Santa Cruz, in June. It was built in a dense blackberry-bush, about three feet from the ground, constructed with a thick periphery and base of dry grasses and thin strips of bark, and lined with finer grasses. The eggs were of a smoky white, densely speckled with a dull brown. Although this bird was abundant around Santa Cruz, he was only able, after much searching, to find two of their nests. One was in a willow, close against the tree, and three feet from the ground, containing, on the 11th of May, four eggs partially hatched. This was built of coarse dry stems and leaves, lined with finer grasses and horse-hair. It was five inches in external diameter, and four high. The cavity was two and a half inches deep and two in diameter. These СКАЧАТЬ