. On the natural history and classification of birds . erfectly smooth. Wings verylong, equal to the tail, which is slightly forked. NorthAmerica. C. Americanus. N. Zool. ii. Wilson, 40. f. 1, , Sw. General structure of Caprimulgus ; but the outer lateral toe is shorter than the , Rictus strongly bristled. Tail lengthened,graduated, or rounded. S. climacterus. West. Af. ii. Vieil. Gal. , Sw. Rictus strongly bristled. Wingslong, equal to the tail, and with a lengthened remi-form feather in each. Tail even. Africarms. Sw. West. At ii. Shaw,
. On the natural history and classification of birds . erfectly smooth. Wings verylong, equal to the tail, which is slightly forked. NorthAmerica. C. Americanus. N. Zool. ii. Wilson, 40. f. 1, , Sw. General structure of Caprimulgus ; but the outer lateral toe is shorter than the , Rictus strongly bristled. Tail lengthened,graduated, or rounded. S. climacterus. West. Af. ii. Vieil. Gal. , Sw. Rictus strongly bristled. Wingslong, equal to the tail, and with a lengthened remi-form feather in each. Tail even. Africarms. Sw. West. At ii. Shaw, N. Miss. pi. , Sw. Rictus almost smooth. Wings verylong, equal to the tail, which is short and very naked. America. P. diurnis. Pi. Col. 182. Family HIRUNDINIDiE. compact, glossy. Bill very small and trian-gular. Cypselus, Aristotle. Margins of the bill inflected andslightly gaping. Gonys ascending. Wings excessive-ly long, curved. Feet small, weak. Tarsus very shortz 2 340 ON THE CLASSIFICATION OF BIRDS. 292. Cypselus. {fig. 292. a) Tarsus thickly feathered. All the four toes directed forwards; the two middle equal. The hallux, or inner toe, shorter than the exterior. Tail forked or even. C. apus. Selby, pi. 42. f. , Sw. (fig. 2Q2. c) Tarsus remarkably short, naked. Anterior toes long; the outer scarcely shorter than the middle ; the inner shortest; hinder toe very short. Tail long, forked. India. M. longipennis. Zool. 111. ii. mystaceus. Less. V. 47. comatus. Chcetura, Stevens, ( b) Feet as in the last, but the tarsus longer than the middle toe. Tail short, even; the shafts prolonged into acute macroptera. Zool. 111. ii. pi. , Linn. Bill flattened its whole length ; the margins not inflected. Rictus smooth. Feet insessorial. Lateral toes equal; middle toe longer than the tarsus, (fig. 29S.) H. rustica. Selby, pi. 42. f. 1.
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