_Young_ (♂, 12,814, Racine, Wisconsin, July, 1859; Dr. R. P. Hoy). Upper surface continuous plain dark sepia-olive; face darker, approaching fuliginous-vandyke,—perfectly uniform; around the edge of the forehead, a few shaft-lines of white; scapulars with a concealed spot of pale ochraceous on lower web; lower feathers of wing-coverts with a few white spots; outer feather of the alula scalloped with white; primary coverts perfectly plain; five outer primaries with white spots on outer webs, these diminishing toward the end of the feathers, leaving only two or three series well defined; tail darker than the wings, with three narrow bands composed of white spots, these not touching the shaft on either web. “Eyebrows” immaculate white; lores more dusky; face and eyelids dark vandyke-brown; sides of the chin white. Throat and whole breast like the back, but the latter paler medially, becoming here more fulvous; rest of the lower parts plain fulvous-ochraceous, growing gradually paler posteriorly,—immaculate. Lining of the wing plain dull white; under surface of primaries with dusky prevailing, but this crossed by bands of large whitish spots; the three outer feathers, however, present a nearly uniformly dusky aspect, being varied only basally. Wing formula, 3, 4–2=5 6–7, 1. Wing, 5.50; tail, 2.80; culmen, .45; tarsus, .80; middle toe, .65. HAB. North America generally. Cold temperate portions in the breeding-season, migrating southward in winter. Mexico (Oaxaca, SCLATER, P. Z. S. 1858, 295); California (DR. COOPER); Cantonment Burgwyn, New Mexico (DR. ANDERSON); Washington Territory (DR. KENNERLY). [Illustration: _Nyctale acadica._ Young.] [Illustration: _Nyctale acadica._ Adult.] A specimen (15,917, ♂, Dr. C. B. Kennerly, Camp Skagitt, September 29, 1859) from Washington Territory is exactly similar to the young described above. No. 10,702 (Fort Burgwyn, New Mexico; Dr. Anderson) is much like it, but the facial circle is quite conspicuous, the feathers having medial white lines; the reddish-olive of the breast and the fulvous of the belly are paler, also, than in the type. No. 12,866, United States, (Professor Baird’s collection, from Audubon,) is perfectly similar to the last. My reasons for considering the _N. albifrons_ as the young of _N. acadica_ are the following (see American Naturalist, May, 1872):— 1st. All specimens examined (including Hoy’s type of _N. kirtlandi_) are young birds, as is unmistakably apparent from the texture of their plumage. 2d. All specimens examined of the _N. acadica_ are adults. I have seen no description of the young.