♀ (2,362, Professor Baird’s collection, Carlisle, Penn.). Wing formula, 2, 3–4–1. Wing, 12.00; tail, 6.00; culmen, .65; tarsus, 1.25; middle toe, 1.15. _Young_ (49,568, Sacramento, Cal., June 21, 1867; Clarence King, Robert Ridgway). Wings and tail as in the adult; other portions transversely banded with blackish-brown and grayish-white, the latter prevailing anteriorly; eyebrows and loral bristles entirely black; legs white. HAB. Whole of temperate North America? Tobago? (JARDINE). Localities: Tobago (JARDINE, Ann. Mag. 18, 116); Arizona (COUES, P. A. N. S. 1866, 50). The American Long-eared Owl is quite different in coloration from the _Otus vulgaris_ of Europe. In the latter, ochraceous prevails over the whole surface, even above, where the transverse dusky mottling does not approach the uniformity that it does in the American bird; in the European bird, each feather above has a conspicuous medial longitudinal stripe of dark brownish: these markings are found everywhere except on the rump and upper tail-coverts, where the ochraceous is deepest, and transversely clouded with dusky mottling; in the American bird, no longitudinal stripes are visible on the upper surface. The ochraceous of the lower surface is, in the _vulgaris_, varied only (to any considerable degree) by the sharply defined medial longitudinal stripes to the feathers, the transverse bars being few and inconspicuous; in _wilsonianus_, white overlies the ochraceous below, and the longitudinal are less conspicuous than the transverse markings; the former on the breast are broader than in _vulgaris_, in which, also, the ochraceous at the bases of the primaries occupies a greater extent. Comparing these very appreciable differences with the close resemblance of other representative styles of the two continents (differences founded on shade or depth of tints alone), we were almost inclined to recognize in the American Long-eared Owl a specific value to these discrepancies. [Illustration: _Otus vulgaris._] The _Otus stygius_, Wagl., of South America and Mexico, is entirely distinct, as will be seen from the foregoing synoptical table.