SP. CHAR. (6,327 ♂, Los Nogales, Northern Sonora, June, C. B. Kennerly.) Similar to _P. æstivalis_, but paler; wings and tail longer. Above light chestnut, all the feathers margined and tipped with bluish-gray, but the reddish prevailing. Interscapular and crown feathers with a narrow streak of black, those on crown indistinct. Beneath dull white, tinged with ashy-ochraceous across the breast and along the sides; crissum pale ochraceous. An obsolete light superciliary, and narrow dusky maxillary stripe. Bend of wing yellow; lesser coverts tinged with greenish-yellow. Length, 6 inches; wing, 2.65; tail, 3.00; bill, .32 from nostril, .25 deep at base; tarsus, .80; middle toe, .63. HAB. Los Nogales, Sonora, and Southern Arizona. This race has a considerable resemblance to _P. æstivalis_, but differs in some appreciable points. The brown of the upper parts is paler, and the ashy edging to the feathers appears rather less extensive. The dark brown blotches on the back are of greater extent, the black streaks on the back confined to a mere streak along the shaft. There is less of an olive tinge across the breast. The proportions of the present race differ more from those of _æstivalis_ than do the colors, the bill being more slender, and the wings and tail considerably longer. The resemblance to _P. botterii_ (= _æstivalis_, var. _botterii_) of Sclater, from Middle Mexico (Orizaba, Colima, etc.), is very close; the difference being greater in the proportions than in the colors, the latter having a shorter wing and tail, with thicker bill, as in var. _æstivalis_. In _botterii_ there is rather a predominance of the black over the rufous in the streaks above. HABITS. This, in its general habits, nesting, eggs, etc., probably resembles the variety _æstivalis_. Peucæa cassini, BAIRD. CASSIN’S SPARROW. _Zonotrichia cassini_, WOODHOUSE, Pr. A. N. Sc. Ph. VI, April, 1852, 60 (San Antonio). _Passerculus cassini_, WOODHOUSE, Sitgreaves’s Rep. Zuñi and Colorado, 1853, 85; Birds, pl. iv. _Peucæa cassini_, BAIRD, Birds N. Am. 1858, 485, pl. iv, f. 2.—HEERMANN, X, c, p. 12, pl. iv, f. 2.—COOPER, Orn. Cal. 1, 219 (not from Cal.).