Sialia sialis, Baird.
EASTERN BLUEBIBD.
Motacilla sialis, Linn. S. N. 1758, 187 (based on Catesby, I, pl. xlvii). Sialia sialis, Baird, Birds N. Am. 1858, 222; Rev. 62.—Boardman, Pr. Bost. Soc. 1862, 124 (Calais, Me.; very rare).—Dresser, Ibis, 1865, 465 (Texas, winter).—Samuels, B. N. Eng., 175. Sialia wilsoni, Swainson, Zoöl. Jour. III, 1827, 173.—Cab. Jour. 1858, 120.—Gundlach, Cab. Jour. 1861, 324; Repertorio, 1865, 230.—Jones,
Nat. Bermuda, 1859, 28, 66 (resident in Bermuda). Sylvia sialis, Lath.; Ampelis sialis, Nutt.; Erythraca wilsoni, Sw.
Figures: Vieillot, Ois. Am. Sept. II, pl. ci, cii, ciii.—Wils. I, pl. iii.—Aud. Orn. Biog. II, pl. cxiii.—Ib. B. A. II, pl. cxxxiv.—Doughty, Cab. I, pl. xii.
Sp. Char. Entire upper parts, including wings and tail, continuous and uniform azure-blue; the cheeks of a duller tint of the same. Beneath reddish-brown; the abdomen, anal region, and under tail-coverts white. Bill and feet black. Shafts of the quills and tail-feathers black. Female with the blue lighter, and tinged with brown on the head and back. Length, 6.75; wing, 4.00; tail, 2.90.
Young. Males of the year dull brown on head and back; and lesser coverts streaked, except on head, with white. Throat and fore part of breast streaked with white. Tertials edged with brown. Rest of coloration somewhat like adult.
Hab. Eastern United States; west to Fort Laramie, Milk River; north to Lake Winnipeg; resident in Bermuda; Cuba (rare), Gundlach.
A specimen from Guatemala (50,411 ♂, Van Patten) referrible to the var. azurea is undistinguishable in color from North American examples; the wings and tail are longer, however, measuring respectively 4.20 and 3.00.
