. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and lower California, with which are incorporated General ornithology, an outline of the structure and classification of birds, and Field ornithology, a manual of collecting, preparing, and preserving birds . lidon lunifrons. Aside from three extralimital species (Progne cryptoleuca, Petrochelidon fulva, and Calli-chelidon cyaneoviridis), lately ascertained to occur as stragglers in Flo
. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and lower California, with which are incorporated General ornithology, an outline of the structure and classification of birds, and Field ornithology, a manual of collecting, preparing, and preserving birds . lidon lunifrons. Aside from three extralimital species (Progne cryptoleuca, Petrochelidon fulva, and Calli-chelidon cyaneoviridis), lately ascertained to occur as stragglers in Florida, the seven estab-lished North American species, referable to six genera, may readily be determined by thefollowing Analysis 0/ Genera and deeply forficate, with linear lateral feathers ; lustrous steel-blue above, rufous below . Hirundo erythrogaster Tail simply emarginate ; lustrous green ; beneath wliite Tachycineta bicolor Tail simply emarginate ; opaque velvety green ; beneath white Tachycineta thalassina Tail nearly even ; lustrous steel-blue ; rump rufous Petrochelidon lunifrons Tarsus with tuft of feathers below ; lustreless gray ; below white Clivicola riparia Outer edge of first primary serrate ; lustreless brownish ; paler below . Stelgidopteryx serripennis Bill very stout, curved ; male entirely lustrous blue-black .... Progne subi* 352 SYSTEMATIC SYNOPSIS.—PASSERES— Fig. 207. — Generic details of Hirundo [H. erythro-gastra, uat. size). (Ad. nat. del. E. C.) HIRUNDO. (Lat. hirundo, a swallow. Fig. 207.) Barn Swallows. Tail deeplyforficate, nearly or about as long as wings; lateral feather linear-attenuate, about twice as long as middle feather. Tarsi shorter thanmiddle toe and claw, above feathered for a littledistance ; basal joint of middle toe partly adherentto both lateral toes. Bill of moderate size forthis family, of usual shape, with straight com-missure ; nostrils lateral, overarched by a mem-branous scale. Upper parts glossy
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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectbirdsnorthamerica
