3. Length, 11.75; wing, 4.85 to 5.60; tail, 4.60 to 5.50, its graduation, .90; culmen, 1.38 to 1.66. Dark purple of neck sharply defined against the dull blackish olive-green of the body. Wings and tail greenish-blue; tail-coverts violet-blue. _Female._ Wing, 4.65 to 4.90; tail, 3.80 to 4.60. _Hab._ South Florida; resident var. _agelaius_. B. HOLOQUISCALUS. (CASSIN.) Tail shorter than wings; sexes similar. Color glossy black, but without varying shades of gloss; nearly uniform in each species. Tail moderately graduated. _Hab._ West India Islands, almost exclusively; Mexico and South America. Q. baritus. Black, with a soft bluish-violet gloss, changing on wings and tail into bluish-green. _Culmen decidedly curved; base of mandibles on sides, smooth._ 1. Bill robust, commissure sinuated; depth of bill, at base, .54; culmen, 1.33; wing, 6.15; tail, 5.50, its graduation, 1.30. _Female._ Wing, 5.20; tail, 4.70; other measurements in proportion. _Hab._ Jamaica var. _baritus_.[43] 2. Bill slender, commissure scarcely sinuated; depth of bill, .43; culmen, 1.35; wing, 5.40; tail, 5.10, its graduation, 1.20. _Female._ Wing, 4.60; tail, 4.20. _Hab._ Porto Rico var. _brachypterus_.[44] _Culmen almost straight; base of mandibles on sides corrugated._ 3. Depth of bill, .51; culmen, 1.44; wing, 6.00; tail, 5.50, its graduation, 1.50. _Female._ Wing, 5.15; tail, 4.80. _Hab._ Cuba var. _gundlachi_.[45] 4. Depth of bill, .40; culmen, 1.35; wing, 5.00; tail, 4.50, its graduation, .85. _Hab._ Hayti var. _niger_.[46] C. MEGAQUISCALUS. (CASSIN.) Tail longer than wings. Sexes very unlike. Female much smaller, and very different in color, being olivaceous-brown, lightest beneath. Male without varying shades of color; lateral tail-feather about .60 the middle, or less. Q. major. Culmen strongly decurved terminally; bill robust. _Female_ with back, nape, and crown like the wings; abdomen much darker than throat. _Lustre of the plumage green, passing into violet anteriorly on head and neck._ 1. Length, 15.00; wing, 7.50; tail, 7.70, its graduation, 2.50; culmen, 1.60. _Female._ Wing, 5.10. _Hab._ South Atlantic and Gulf coast of United States var. _major_. _Lustre, violet passing into green posteriorly._ 2. Length, 14.00; wing, 6.75; tail, 7.20, its graduation, 2.40; culmen, 1.57. _Female._ Wing, 5.30; tail, 5.00. _Hab._ Western Mexico. (Mazatlan, Colima, etc.) var. _palustris_.[47]