Char. Adult (9,147, Camp 118, New Mexico, February 10, 1854; Kennerly and Möllhausen). Above cinereous, the ashy appearance being caused by a minute transverse mottling of blackish and pale ashy, on a deeper ash ground; each feather with a distinct medial stripe of black, these broadest on the forehead; outer webs of only a few scapulars white, these not bordered with black; outer webs of two or three lower middle and secondary coverts white. Secondaries with about seven transverse, mottled pale bands; primaries with about eight transverse series of white spots; tail with about eight narrow pale bands.
Ear-coverts, cheeks, throat, neck, and jugulum finely and uniformly barred transversely with dusky and grayish-white; the facial circle interrupted across the throat, where in its place is a series of longitudinal black dashes.
Lower parts grayish-white, with numerous, very narrow transverse bars of dusky, rather more distant from each other than those of the neck, etc.; each feather with a medial narrow stripe of black, those on the breast forming conspicuous spots; tibiæ and tarsi dull soiled white, with numerous spots of dark brown; lower tail-coverts immaculate. Wing-formula, 3=4–2, 5, 6, 7, 8–1–9. Wing, 6.50; tail, 3.30; culmen, .55; tarsus, 1.15; middle toe, .70; ear-tufts, .85.
(A specimen from California (Stockton, E. S. Holden), kindly sent by Mr. Lawrence for examination, differs from the preceding in rather more brown ground-color above; the black shaft-streaks more obscure. In other respects as regards plumage it is the same, and is typical maccalli. The size is less, it measuring, wing, 6.20; tail, 3.10.)
Young (first full, but incomplete plumage; 16,932, Cape St. Lucas, Lower California). Secondaries, primaries, and tail as in the gray adult. Rest of the plumage transversely barred with grayish-white and dusky, the latter predominating on the upper parts; eyebrows and lores white; rings finely transversely mottled with white, this forming spots on the lower feathers; tibiæ and tarsi with numerous transverse dusky bars. Wing, 5.40; tail, 2.65; tarsi, 1.00; middle toe, .63. No. 16,933 (same locality, etc.) is similar, but smaller, measuring, 5.00, 2.00, 1.00, and .60.
Hab. Southern Middle Province of United States; Lower and Southern California.
Localities. (?) Oaxaca (Scl. 1858, 296); (?) Guatemala (Scl. Ibis, I, 220); (?) Texas (Dresser, Ibis, 1856, 330).
While the Scops maccalli is without doubt to be distinguished from S. asio, its being specifically distinct is not a matter of so much certainty; with a simple statement of the differences between the two, I shall leave the value of these differences to the appreciation of each one, according to his own fancy. The species is represented in the collection by but four specimens, two adult and two young. I have not seen the red plumage as described by Cassin.
The characters of this race, as given in the diagnosis, appear to be really constant; and there is not a specimen in the series of those from the west which may not readily be referred to one or the other.
The gray adult maccalli differs from that of asio in the much finer mottling of the general plumage; the medial black stripes of the feathers above being more sharply defined, and more distinct from the transverse zigzags. Below, the transverse dark bars are much finer, and nearer together. The face, neck, and jugulum more finely and uniformly barred. The white scapular spots have not the black border seen in asio. The size is smaller.