One specimen (8,193) from Fort Leavenworth, with a few white spots only on the scapulars, may perhaps be considered a hybrid between arcticus and erythrophthalmus.
In some specimens the interscapulars are edged externally with white. The feathers of throat and sides of head show occasional concealed spots of white about the middle. As in erythrophthalmus, the bases of the primaries are white along the outer edge, showing under the primary coverts, sometimes, but perhaps not generally, confluent with the white towards the end of the same web.
The female is of a dull ashy-brown, difficult to describe, but with only a slight tinge of the rufous seen in P. erythrophthalmus, which is most distinct on top of head and back. There is an almost inappreciable ashy superciliary stripe.
The young bird resembles in general appearance that of megalonyx, but is lighter colored, and with the dusky streaks on the jugulum much narrower. The brown above is as light as in erythrophthalmus, but without the reddish cast seen in the latter, and not blackish, as in megalonyx.
Habits. The Saskatchewan or Arctic Ground Finch was first met with by Sir John Richardson. It was observed by him only on the plains of the Saskatchewan, where he had no doubt of its breeding, as one specimen was killed late in July. It was said to arrive in that region in the end of May, and to frequent shady and moist clumps of wood. It was generally seen on the ground. Its habits, so far as they were observed, correspond with those of the Towhee Bunting, which it closely resembles in external appearance. It feeds on grubs, and is a solitary and retired, but not a distrustful bird.
Besides its occurrence in the Valley of the Saskatchewan, these birds have often been found on the high central plains of the Upper Missouri, on the Yellowstone and Platte Rivers. Audubon met with it at Fort Union. Dr. Hayden obtained it on the Yellowstone, in August; at Fort Lookout, June 22; at Bijou Hills, from May 1 to the 15th; at Bon Homme Island, May 9. Dr. Cooper obtained it at Fort Laramie in September. Mr. Allen found it in Colorado, where it was more abundant on the foothills than on the plains. He also found this species an abundant inhabitant of the thickets in the valley of the Great Salt Lake, in its habits strongly resembling the common birds of the Eastern States. Though its song is also somewhat similar, its call-note, he adds, is totally different, very nearly resembling that of the Catbird.
Dr. Woodhouse met with but few of these birds either in the Indian Territory or in New Mexico. Mr. Dresser, in November, 1863, when hunting in the Bandera Hills, noticed several of these birds near the camp, and obtained several near San Antonio during the winter. None of these birds appear to have been observed in the Arctic regions beyond the Saskatchewan Plains.
Mr. Nuttall met with this species on the western slopes of the Rocky Mountains, but as he apparently did not appreciate the difference between this form and the oregonus, we cannot determine with certainty to which his descriptions apply in all cases. He found it, in manners and habits, the counterpart of our common eastern species, frequenting forests and scratching among the dead leaves among bushes and thickets. He describes it as more shy than the common species. If the nest be invaded, the male shows more boldness, and reiterates his complaints until the cause of his alarm is removed. He speaks of its warble as quaint and monotonous, and very similar to the notes of the Towhee,—but the note of our bird, towhee, is never heard west of the mountains. In its stead this bird is said to have a note like the mew of a cat.
The egg of the arcticus is oval in shape, and measures one inch in length by .70 in breadth. It has a white ground, but is so generally and so thickly covered with fine dots of umber-brown, intermingled with paler markings of lavender and neutral tints, that the ground can hardly be distinguished.
Common Characters. Grayish-brown above, with a more or less appreciable rufous tinge on the crown. A patch covering the throat, ochraceous or white, contrasting with the surrounding portions, and encircled more or less completely, especially posteriorly, by dusky spots; lores like the chin. Crissum deep ochraceous, the lower part of abdomen tinged more or less with the same.
A. No trace of white tips to middle wing-coverts. Throat ochraceous.
a. Crown only faintly tinged with rufous.
1. Abdomen pale grayish-brown; throat and lores deep reddish-ochraceous; the deep ochraceous confined posteriorly to lower tail-coverts. Wing, 3.90; tail, 5.00. Hab. California … var. crissalis.
2. Abdomen distinctly white centrally, but surrounded by grayish laterally and anteriorly; throat and lores pale ochraceous; deep ochraceous of crissum extending forward over lower part of abdomen. Wing, 3.80; tail, 4.00. Hab. Mexico … var. fuscus.24
b. Crown very distinctly rufous.
3. The ochraceous of posterior under parts spreading over whole lower part of abdomen and flanks. Ochraceous of the throat palest anteriorly, the chin and lores being almost white; it spreads over the jugulum also, outside the series of rather scattered dusky spots. Whole breast white. Wing, 3.80; tail, 4.30. Hab. Southern Middle Province of United States … var. mesoleucus.
4. The ochraceous of under parts confined to crissum and anal region; ochraceous of the throat palest posteriorly, where it is nearly white, and confined within the encircling series of rather coalesced dusky spots. Abdomen, only, white. Wing, 3.80; tail, 4.20. Hab. Cape St. Lucas … var. albigula
B. Middle coverts distinctly, and greater obsoletely, tipped with white. Throat white crossed by an ochraceous band.
5. Crown without a trace of rufous. Dusky spots surrounding the white gular patch, coalesced posteriorly into a narrow crescent. Whole breast and abdomen white, somewhat broken anteriorly. Flanks and lower tail-coverts ochraceous. Wing, 3.30; tail, 3.70. Hab. Mexico … (var. ?) albicollis25
Pipilo fusca, Cassin, Illust. I, IV, 1853, 124, pl. xvii (the figure seems to be of the California species, the description more like mesoleucus).—Newberry, Zoöl. Cal. & Or. Route, Rep. P. R. R. VI, IV, 1857, 89. Kieneria fusca, Bonap. Comptes Rendus, XL, 1855, 356. Fringilla crissalis, Vigors, Zoöl. Blossom, 1839, 19. Oriturus wrangeli, Brandt, Bonap. Comp. Rend. 43, 1856, 413. Pipilo fuscus, Baird, Birds N. Am. 1858, 517.—Heerm. X, S, 51 (nest).—Cooper, Orn. Cal. I, 245.
Pipilo fuscus, var. crissalis.
5559 ♂
Sp. Char. Above dark olive-brown, the crown with a very slight tinge of scarcely appreciable dark rufous. Under parts with the color somewhat similar, but of a lighter shade, and washed with grayish; middle of the belly only whitish; the under tail-coverts pale rufous, shading into lighter about the vent and sides of lower belly; chin and throat well-defined pale rufous, margined all round by brown spots, a few of them scattered within the margin. Eyelids and sides of head, anterior to the eye, rufous like the throat. One or two feathers on the lower part of the breast with a concealed brown blotch. Outer primary not edged with white. Fifth quill longest; first shorter than ninth, or even than secondaries. Bill pale brown, darker above; legs light. Length, 8.50 inches; wing, 4.00; tail, 4.60.
Hab. Coast region of California.
The bill is sinuated, as in P. aberti, differing from that of P. erythrophthalmus.
This race is very similar to the original P. fuscus of Mexico, the original description of Swainson answering almost exactly. It is, however, considerably larger; the proportions of wing are similar; and there is no decided indication of whitish in the middle of the body beneath, such as is always distinctly appreciable in fuscus, and still more in mesoleucus.
A