_a._ ♂. Head above, and wings, fine bluish-ash; usually one tail-feather only (the outer) variegated. 1. Vertex with a conspicuous patch of rufous. ♂. Black zone of the tail 1.00 in width; breast strongly tinged with ochraceous; spots of black on the breast or sides circular. ♀. Above fulvous-rufous, the whole breast and sides with longitudinal dashes of a lighter tint of the same. _Hab._ Continent of North America north of Panama (except Caribbean and Gulf coast) … var. _sparverius_. 2. Vertex with only a trace of rufous, or none at all. ♂. Black zone of tail only .60 in width; breast nearly pure white; spots of black usually only on the sides, elliptical. ♀. Above vinaceous-rufous; longitudinal markings beneath deeper brown. _Hab._ Continent of South America (except North Atlantic and Caribbean coast) … var. _australis_.[64] _b._ ♂. Head above, and wings, dark bluish-plumbeous; several outer tail-feathers variegated. 3. Vertex without any rufous. ♂. Anterior portions beneath deep ochraceous, without spots. Tail without indication of bars anterior to the subterminal one; black bars above confined to larger scapulars. ♀. Above ferruginous, with the black bars broader and blacker than in either of the preceding. _Hab._ Gulf, Caribbean, and Atlantic coasts of tropical continental America (Florida to Cayenne) … var. _isabellinus_. 4. Vertex with a patch of rufous. ♂. Black spots beneath numerous, large and circular. Tail with more or less complete black bars anterior to the subterminal band, sometimes regularly barred to the base; black bars above covering entire rufous surface. ♀. Similar to that of _isabellinus_, but markings beneath more numerous, and pure black instead of brown. _Hab._ Lesser Antilles, north to St. Thomas … var. _dominicensis_.[65] =B.= Tail tipped with deep rufous; outer tail-feather unvariegated. 5. Head above dark slaty-plumbeous, without any rufous. ♂. Tail continuous rufous to the extreme tip, the subterminal black band narrower than the terminal rufous one, and not continuous; the outer feather entirely rufous, without any black. In other respects much like var. _australis_. (♀ not seen.) _Hab._ Chile and Western Brazil … var. _cinnamominus_.[66] Falco (Tinnunculus) sparverius, LINN. Var. =sparverius=, LINNÆUS. AMERICAN SPARROW HAWK; AMERICAN KESTREL.