Petrochelidon lunifrons. Descriptions of First Plumage of Certain North Am. Bbs. Wm. Brewster. 45. Petrochelidon lunifrons. First plumage: male. Top of head, back, and scapulars dark brown ; collar around nape, dull ashy, tinged anteriorly with rusty. Rump as in adult, but paler; forehead sprinkled with white, and with a few chestnut feathers. Secondaries broadly tipped with ferruginous. Throat white, a few feathers spotted centrally with dusky. Breast and sides ashy, with a rusty suffusion, most pronounced on the latter parts. A very small area of pale chestnut on the cheeks. From a specimen in my collection taken at Upton, Me., July 27, 1874. Bull. N. O. C. 3. April, 1878. p. 63.