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

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      Comparing this race with arcticus, we do not find much difference in the white of the scapular region, except that the white marks here, as elsewhere on the wing, are rounded, the extreme end of the outer web of the feather being black instead of running out acutely white to the very tip of the outer webs of the feathers. This gives rather less extension to the white. In fact, most of the white marks are edged externally with black, converting them into spots. There is no white whatever at the exposed base of the outer web of the second to fifth primaries, and there is only a trace of white near the end, instead of having a conspicuous white edging from base to near the tip.

      The outer web of the outer tail-feather, instead of being entirely white for the exposed portion, is only very slightly edged with white; usually entirely black. The white at the end of the feathers is much more restricted, and extends only over the three outer feathers; usually not reaching to the shaft. The relations to var. megalonyx have been given under the latter head.

      Habits. The Oregon Ground Robin, so far as known, has a restricted residence, the western portion of Oregon and Washington Territory during the summer, and in the more northern portions of California. Its occurrence in the latter State seems to have escaped the notice of Dr. Cooper, though he gives it conjecturally, having seen birds which he supposed to be of this species in the higher Sierra Nevada. In its habits and notes Dr. Cooper could observe no difference between this species and P. megalonyx, both having the complaining mew, from which they have obtained the name of Catbird on that coast.

      Mr. J. K. Lord found a nest containing six eggs, which he supposed to belong to a bird of this species, at Fort Colville. It was built on the top of a stump, round which young shoots had grown like a fringe, completely hiding it from the sharpest eye. Mr. Hepburn met with it at Victoria.

      Dr. Cooper, in his Report on the Birds of Washington Territory, states that the song of this species in spring, as it sits on a low bush enjoying the sunshine, is like the final trill of the Redwing, or the lisping faint notes of the Cowbird. It is a constant resident of the Territory, but only frequents the edge of the coast in winter. He also mentions finding it about thirty miles south of San Francisco in autumn. Dr. Suckley met with it west of the Cascade Mountains.

      In very many respects, in the opinion of Mr. Ridgway, the Oregon Ground Robin very closely resembles the common and familiar eastern “Chewink.” There is noticeable in this western representative a peculiar manner of flight, and a predilection for bushy places, closely corresponding with those of the eastern bird. It differs, in the most marked manner, however, in its extreme shyness, and in the total absence of the agreeable and striking notes of the Towhee. The notes of this bird are, he states, of the rudest description, and instead of being familiar and unsuspicious, it is one of the shyest and most difficult to approach of any of the western birds.

      He found it quite plentiful about Sacramento, where it inhabits the thickets in company with the western Chat. After crossing the Sierra Nevada it was found more abundant still in the chaparrals of the sheltered ravines on the eastern base of those mountains, as well as in the shrubbery of the river valleys. During the winter it forsakes the former for the latter localities. Eastward this species was found as far as the West Humboldt Mountains, where typical examples were obtained.

      At Carson City, early in March, his attention was attracted by the peculiar notes of this Pipilo; the bird was sitting on a high rock above the thick chaparral of the hillside, and sharply defined against the sky. It was readily distinguishable by the black of its head and breast, in sharp contrast with the pure white of its lower parts. Every few moments it would raise its head to utter, in a short trill, its rude song. When approached, it would jerk its expanded white-tipped tail, and disappear among the bushes. It was abundant in the chaparrals, on the hillsides, and among the thickets and buffalo-berry bushes along the rivers. The males were in full song, perching, as they sang, on a prominent rock or bush.

      Mr. Nuttall met with a nest of this species on the 14th of June. It was built in the shelter of a low undershrub, in a depression scratched out for its reception. It was made of a rather copious lining of clean wiry grass, with some dead leaves beneath, as a foundation. The eggs were four, nearly hatched, very closely resembling those of the Towhee, thickly spotted over, but more so at the larger end, with very small round and very numerous reddish-chocolate spots. The pair showed great solicitude about their nest, the male, in particular, approaching boldly to scold and lament at the dangerous intrusion.

      The Oregon Ground Robin Mr. Lord considered a quaint and restless bird. He found it very abundant from the coast to the summit of the Rocky Mountains, and also very common on Vancouver Island. It arrives the last of April and first of May, and frequents dark woods and thick tangled underbrush. He describes it as stealthy and shy, with a habit of hiding, but its cry usually betrays its place of concealment. This cry he states to be like the squall of the Catbird.

      Mr. Townsend found it abundant on the Columbia, where, as he observed, it lived mostly on the ground, or on bushes near the ground, rarely ascending trees. Mr. Audubon gives the measurement of its egg as 1.12 inches in length and .87 in breadth.

      The egg of this species is more rounded than are those of this genus generally, and there is but little difference between the two ends. The ground-color is white, with a greenish tinge, and is very generally and profusely spotted with fine markings of reddish and purplish-brown. They measure .95 by .80 of an inch.