21. D. virens. Olive-green above, the crown and back without streaks; beneath white, the breast and anal region tinged with black. _Hab._ Eastern Province of North America, from Greenland to Panama; Cuba; Oaxaca; Heligoland, Europe! _Black of throat confined anteriorly to the jugulum; no yellow spot on forehead._ 22. D. townsendi. Above olive-green, the crown and back with conspicuous black streaks; beneath yellow anteriorly, and white posteriorly. ♀, black of throat mixed with yellow; _juv._, no black on throat, and streaks on back obsolete. _Hab._ North and Middle Province of United States, south, in winter, into Guatemala. B. Sides not streaked; black of throat with its posterior outline convex. 23. D. occidentalis. Above ash tinged with olive; beneath white. Head nearly all yellow. ♂. Top of head yellow with a few small black spots; nape black; back streaked with black; sides pure white. (♀ not seen.) _Juv._ Yellow of crown overlaid by olive; above greenish-plumbeous, without any black on nape or back; throat yellowish-whitish; sides tinged with ashy. _Hab._ Western and Middle Province of United States, south to Guatemala. Group C. A. Above ash; no supra-loral stripe; eyelids not yellow. 24. D. kirtlandi. Above, including side of head and neck, bluish-ash; crown and back streaked with black; beneath (except crissum) pale yellow; breast speckled, and sides streaked with black; lores and orbital region, black; eyelids white. _Hab._ Eastern Province of United States (Cleveland, Ohio), and Bahamas. 25. D. pityophila.[50] Above, including side of head and neck, dull ash; the forehead and crown olive-green; crown and back not streaked; beneath white; the throat and jugulum yellow; sides ashy; no specks on breast, nor streaks on sides, but a few along side of neck, between the ash and yellow. _Hab._ Cuba. B. Olive-green or brown above; a supra-loral stripe of yellow; eyelids yellow. _a._ Above olive-green, without streaks; crissum white; sides of breast with obsolete grayish streaks. 26. D. pinus. Forehead and ear-coverts olive; abdomen white; yellow supra-loral stripe not continued behind the eye. ♀ more grayish; _juv._ above umber, beneath light grayish-brown, tinged with yellow. _Hab._ Eastern Province of United States; Bahamas. ? 27. D. montana. Forehead and ear-coverts yellow; abdomen yellow; yellow supra-loral stripe continued past the eye into the yellow of the auriculars. (♀ and other stages unknown.) _Hab._ “Blue Mountains of Virginia.” _b._ Above olive-green, the back streaked with chestnut; crissum yellow; streaks of black on sides.