SP. CHAR. Size and general appearance probably that of _R. satrapa_. A black band on the forehead passing back, through and behind the eye, separated by a grayish band from another black band on the crown, which embraces in the centre of the crown an orange patch. Length, 4.25 inches; extent of wings, 6. HAB. “Banks of Schuylkill River, Penn. June, 1812.” AUD. This species continues to be unknown, except from the description of Mr. Audubon, as quoted above. It appears to differ mainly from _R. satrapa_ in having two black bands (not one) on the crown anteriorly, separated by a whitish one; the extreme forehead being black instead of white, as in _satrapa_. The specimen was killed in June, 1812, on the banks of the Schuylkill River, in Pennsylvania. Regulus calendula, LICHT. RUBY-CROWNED KINGLET. _Motacilla calendula_, LINN. Syst. Nat. I, 1766, 337. _Regulus calendula_, LICHT. Verz. 1823, no. 408.—BAIRD, Birds N. Am. 1858, 226; Rev. 66.—SCLATER, P. Z. S. 1857, 202.—IB. 1858, 300 (mountains of Oaxaca).—IB. 1859, 362 (Xalapa).—IB. 1864, 172 (City of Mex.).—SAMUELS, 178.—DALL & BANNISTER (Alaska).—COOPER, Birds Cal. 1, 33.—IB. Ibis, I, 1859, 8 (Guatemala).—COOPER & SUCKLEY, P. R. R. XII, II, 1859, 174.—REINHARDT, Ibis, 1861, 5 (Greenland).—DRESSER, Ibis, 1865, 475 (Texas, winter). _Corthylio calendula_, CAB. Jour. Orn. I, 1853, 83 (type of genus). _Regulus rubineus_, VIEILL. Ois. Am. Sept. II, 1807, 49, pl. civ, cv. Other figures: WILS. Am. Orn. I, 1808, pl. v, fig. 3.—DOUGHTY, Cab. II, pl. vi.—AUD. Orn. Biog. II, pl. cxcv.—IB. Birds Am. II, pl. cxxxiii. SP. CHAR. Above dark greenish-olive, passing into bright olive-green on the rump and outer edges of the wings and tail. The under parts are grayish-white tinged with pale olive-yellow, especially behind. A ring round the eye, two bands on the wing-coverts, and the exterior of the inner tertials white. _Male._ Crown with a large concealed patch of scarlet feathers, which are white at the base. Female and young without the red on the crown. Length, 4.50; wing, 2.33; tail, 1.85. HAB. Greenland; whole of North America, and south to Guatemala. Oaxaca (high region, November), SCLATER. Xalapa and Guatemala, SCLATER. This species of _Regulus_ appears to lack the small feather which, in _satrapa_, overlies and conceals the nostrils, which was probably the reason with Cabanis and Blyth for placing it in a different genus. There is no other very apparent difference of form, however, although this furnishes a good character for distinguishing between young specimens of the two species.