The Oregon Snowbird in full plumage is readily distinguishable from the eastern species by the purer white of the belly; the more sharply defined outline of the black of the head passes directly across the upper part of the breast, and is even convex in its posterior outline, without extending down the side of the breast, with its posterior outline strongly concave, as in hyemalis. The absence of black or ashy-brown under the wings, with the rufous tinge, are highly characteristic of oregonus. The head and neck are considerably blacker; the rufous of the back and wings does not exist in the other. The wings and quills are more pointed; the second quill usually longest, instead of the third, etc. The dusky of the throat reaches in J. oregonus only to the upper part of the breast; to its middle region in hyemalis.
Sometimes, in adult males, the middle and greater wing-coverts are faintly tipped with white, indicating two inconspicuous bands.
In a large series of Juncos collected at Fort Whipple, Arizona, by Dr. Coues, are several specimens so decidedly intermediate between J. oregonus and J. caniceps as to suggest the probability of their being hybrids; others, from Fort Burgwyn and Fort Bridger, are exactly like them. With the ashy head and jugulum, and black lores, as well as bright rufous back, of the latter, the sides are pinkish as in the former; while, as in this too, the posterior outline of the ash on jugulum is convex, not concave, and the rufous of the back has a tendency to tinge the wings, instead of being confined to the interscapulars. (See foot-note to synoptical table, p. 579.)
Habits. Dr. Suckley found this bird extremely abundant in Oregon and Washington Territory, where it holds about the same position that the hyemalis
does in the Eastern States. Dr. Cooper states it to be a very common bird in Washington Territory, especially in the winter, when it comes about the houses and farms with precisely the same habits as the common Atlantic species. In the summer it is seen about Puget Sound, in which neighborhood it breeds. He met with young fledglings as early as May 24. At that season they were not gregarious, and were found principally about the edges of woods.
Mr. Ridgway also regards the western Snowbird as, in all appreciable respects, an exact counterpart of the eastern hyemalis. In summer he found it inhabiting the pine woods of the mountains, but in winter descending to the lowlands, and entering the towns and gardens in the same manner with the eastern species.
Dr. Cooper states this species to be numerous in winter in nearly every part of California. In the summer it resides among the mountains down to the 32d parallel. On the coast he has not determined its residence farther south than Monterey. The coolness of that locality, and its extensive forests of pines extending to the coast, favor the residence of such birds during the summer. At San Diego he observed them until the first of April, when they retired to the neighboring mountains. A few also were found in the Colorado Valley in the winter. On the Coast Mountains south of Santa Clara he found them breeding in large numbers in May, 1864. One nest contained young, just ready to fly, as early as May 13. This was built in a cavity among the roots of a large tree on a steep bank. It was made of leaves, grasses, and fine root-fibres. On the outside it was covered with an abundant coating of green moss, raised above the surface of the ground. The old birds betrayed the presence of the nest by their extreme anxiety. On the 20th he found another nest on the very summit of the mountains, supposed to be a second laying, as it contained but three eggs. It was slightly sunk in the ground under a fern, and formed like the other, but with less moss around its edge. It was lined with cows’ and horses’ hair. The eggs were bluish-white, with blackish-brown spots of various sizes thickly sprinkled around the larger end, and measuring .74 by .60 of an inch.
The only song Dr. Cooper noticed, of this species, was a faint trill much like that of the Spizella socialis, delivered from the top of some low tree in March and April. At other times they have only a sharp call-note, by which they are distinguishable from other Sparrows. While some migrate far to the south in winter, others remain as far north as the Columbia River, frequenting, in large numbers, the vicinity of barns and houses, especially when the snow is on the ground. They raise two broods in a season.
Dr. Coues found this species a very common winter resident in Arizona, arriving at Fort Whipple about October 10, soon becoming very abundant, and continuing so until the second week in April. Stragglers were seen until May 10.
Dr. Woodhouse also observed numbers of the western Snowbird on the San Francisco Mountains, in the month of October, where they were very