+----+-----------+-----------+---------+---------+-----------+----------+ |Sex.| Wing. | Tail. | Culmen. | Tarsus. |Middle Toe.|Specimens.| +----+-----------+-----------+---------+---------+-----------+----------+ | ♂ | 6.50–8.00| 4.50–5.70| .50–.00|1.25–1.55| .95–0.00| 117 | +----+-----------+-----------+---------+---------+-----------+----------+ | ♀ | 6.80–8.40| 4.90–5.80| .55–.55|1.40–1.45| .90–1.00| 95 | +----+-----------+-----------+---------+---------+-----------+----------+ Var. isabellinus, SWAINSON. _Falco isabellinus_, SWAINSON, An. Menag. p. 281, 1838. _Tinnunculus sparverius_, var. _isabellinus_, RIDGWAY, P. A. N. S. Phil. Dec. 1870, p. 149. _Tinnunculus dominicensis_ (not of GMEL.!), STRICKL. Orn. Syn. 1, 100, 1855 (in part only). SP. CHAR. _Adult male_ (3,841, Prairie Mer Rouge, La., June, 1853; “J. F.”). Much like var. _sparverius_, but considerably darker in colors; plumbeous, crown dark with no rufous on vertex, nor darker shaft-lines. Rufous above more purplish-castaneous; cinereous of wings much darker; neck, jugulum, breast, and sides deep soft ochraceous, spots very few, and restricted to the sides. Wing, 7.00; tail, 4.70; tarsus, 1.25; middle toe, .90; culmen, .50. Wing-formula, 2, 3–4, 1. _Adult female_ (58,339, Jacksonville, Fla., June 10, 1869; C. J. Maynard). Differing from the female of var. _sparverius_ in much darker colors, the rufous inclining to castaneous; bars broader, more sharply defined, pure black. Head above pure dark plumbeous, conspicuously different from the fine light ash of var. _sparverius_; vertex with touches only of rufous; markings beneath narrower, and nearly pure black, upon a deeper ochraceous ground. Wing, 7.20; tail, 4.50; tarsus, 1.20; middle toe, .83; culmen, .42. Primaries, 2, 3–1, 4. HAB. North Atlantic and Caribbean coasts of South America, from Demerara northward, along the Gulf coast of Mexico and United States, through Texas and Louisiana to Florida. This form, though quite different in its extreme condition from true _sparverius_, gradually grades into it. Few, if any, other specimens possess in so exaggerated a degree all the distinctive characters of those described, though all from the regions indicated agree in having darker colors and less rufous on the crown than specimens from the interior of North and Middle America.