. Review of American birds in the Museum of the Smithsonian Instution. [microform]. Birds; Oiseaux. HTRUNDINIDiB. 969 all otiiers the bill weaker, more depressed, the commissure nearly ptraight to near the tip. The middle toe ia lengthened ; the tnrsua equal to the toe without the claw, its joint with tibia having overhanging feathers attached, wliich tixtemi on tiie inner face of tlxe tarsus a short distance, in llirutulo, Tnclniciticta, Plerochclidon, Progne. Tarsus similarly feathered, bat proportionally longerâbeing eqnal to middle toe and half the claw, in Neoclielidon, Atticora, Pyijochd
. Review of American birds in the Museum of the Smithsonian Instution. [microform]. Birds; Oiseaux. HTRUNDINIDiB. 969 all otiiers the bill weaker, more depressed, the commissure nearly ptraight to near the tip. The middle toe ia lengthened ; the tnrsua equal to the toe without the claw, its joint with tibia having overhanging feathers attached, wliich tixtemi on tiie inner face of tlxe tarsus a short distance, in llirutulo, Tnclniciticta, Plerochclidon, Progne. Tarsus similarly feathered, bat proportionally longerâbeing eqnal to middle toe and half the claw, in Neoclielidon, Atticora, Pyijochdidon, and Stelgido/iteryz. It is of the same proportion, but entirely bare of feathers in Callichelidon and Notiochelidon. In Colyle alone are there short feathers attached to the posterior face of tarsus near the lower end. Here also alone the lateral claws are very long, reaching considerably beyond the base of the middle claw. In Progne and Phmoprogne the basal joint of middle toe is adherent but littlo more than half way externally, about half way internally; almost the same on both sides. In almost all the rest it is adherent externally nearly to the end, and about half way internally, except in Tachycinela ihdiassiua, where the adhesion is complete on both sides, except at the end of the inner; in Neochelidon and Notiochelidon, where the basal and half the middle joint: and in Atticora, where the basal and the whole middle joint are adherent externally. In Stelgidopteryx the edge of the wing (outer edge of outer primary) is pro- vided with a series of stiflFrecurved hooks; in all other American genera these are entirely wanting, though said to exist in the African genus Psalidoprocne, Cab. The following synopsis may aid in determining the genera and subgenera of American Hirundinidse, although the succession is not strictly natural:â Nostrils broadly oval, or oiroola^; opening upwards and for- ward, and exposed ; without overhanging membrane. Edge of wing smooth. Tarsus
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbirds, bookyear1872
