. Catalogue of the Birds in the British Museum. gg HIRTTNDINID^. Key to the Genera. a. Toes feathered 1- Chelidon, p. 86. b. Toes bare. a'. Nostrils -with a superior membrane, the nasal aperture longitudinal or oval. a". With no indentation or fork on the inner web of the outer tail-feathers. a'". Nostrils lateral, with a distinct lonfritudinal membrane overhang- ing the nasal aperture. «^ Hind toe small and weak, par- ticularly the claw; and not equal to outer toe and claw 2. Cotile, p. Jo. b\ Hind toe very stout and robust, far exceeding outer toe and claw in size 3- Tachycineta, p
. Catalogue of the Birds in the British Museum. gg HIRTTNDINID^. Key to the Genera. a. Toes feathered 1- Chelidon, p. 86. b. Toes bare. a'. Nostrils -with a superior membrane, the nasal aperture longitudinal or oval. a". With no indentation or fork on the inner web of the outer tail-feathers. a'". Nostrils lateral, with a distinct lonfritudinal membrane overhang- ing the nasal aperture. «^ Hind toe small and weak, par- ticularly the claw; and not equal to outer toe and claw 2. Cotile, p. Jo. b\ Hind toe very stout and robust, far exceeding outer toe and claw in size 3- Tachycineta, p. 112. b'". Nostrils oval and exposed, with very slight superior membrane . 4. Phedina, p. i^a. b". Outer feather indented on the inner web, and generally elengated to a great extent. c'". distinct superior membrane .- • 5. Hirtjnbo, p. 123. d'". Nostrils open and exposed, with scarcely any superior membrane. 6. Chebamceca, p. 1/1. b'. Nostrils without any superior membrane, rounded and exposed. c". TaU strongly forked; upper surface for the most part uniform, the rump like the back. e'". Outer toe connected with middle toe as far as the basal joint; cul- minal ridge flattened 7. Pbogne, p 1/2. f". Outer toe connected with themid- dle as well as with its basal joint; culminal ridge rather elevated and onlv slightly rounded 8. AttiCORA, p. 18J. d". Tail square or oiilyslightlyemarginate; rump differing from the back in LP- ^^'^^ coloiu- 9- Petrochelidon, 1. CHELIDON. Type. CheUdon, Bote, Ms, 1822, p. .5^0 C. urbica. _ Delichon, Moore, P. Z. 8. 1854, p. 104 C. Leg of CheNdon iirbica, to show feathered toes. Ffivge. Confined to the Old World. Breeding in the northern parts of Europe and Asia and wintering in India, the Burmese countries, and extending to Borneo. In Africa it reaches to South- eastern Africa and occasionally to West Africa. One species non- migratory, but resident in the Eastern
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