Sylvia discolor, Bonap. Syn. p. 83. Prairie Warbler, Sylvia discolor, Nutt. Man. v. i. p. 294. Prairie Warbler, Sylvia discolor, Aud. Orn. Biog. v. i. p. 76. 98. 23. Sylvicola montana, Wils. Blue-Mountain Warbler. Plate CCCCXXXIV. Fig. 3. Male. No bristles at the base of the bill; wings rather short, the third and fourth quills longest; tail much rounded. Upper parts light greenish-olive; a band across the forehead, one over the eye, the cheeks, throat, fore part and sides of neck bright yellow; the rest of the lower parts yellowish-white, the sides marked with narrow longitudinal dusky streaks; wings dusky brown, all the feathers edged with yellowish-white, the secondary quills more broadly, the first row of small coverts and the secondary coverts tipped with white, forming two conspicuous bands; tail brownish-black, the feathers edged with yellowish-green, the two outer on each side white in their terminal half. _Male_, 4-1/12, wing 2-6/12. Blue Mountains. Only one individual seen. Blue-Mountain Warbler, Sylvia montana, Wils. Amer. Orn. v. v. p. 113. Sylvia tigrina, Bonap. Syn. p. 83; but not of Gmelin or Latham, as the figure of Edwards, to which reference is made, has the tail not rounded, but emarginate. 99. 24. Sylvicola agilis, Wils. Connecticut Wood Warbler.--Connecticut Warbler. Plate CXXXVIII. Male and Female. Wings long, with the first quill longest, and exceeding the first secondary by eleven-twelfths of an inch; middle toe and claw longer than the tarsus; tail of moderate length, nearly even, with acuminate feathers. Male olive-green above; a ring of yellowish-white round the eye; the head, neck all round, and part of the breast ash-grey, the sides greyish-green; the rest of the lower parts bright yellow. Female olive-green above, yellow beneath, the sides of the neck and a band across the breast tinged with brown. _Male_, 5-3/4, 8. New Jersey, Pennsylvania, and Connecticut. Very rare. Migratory. Connecticut Warbler, Sylvia agilis, Wils. Amer. Orn. v. v. p. 64. Sylvia agilis, Bonap. Syn. p. 84. Connecticut Warbler, Sylvia agilis, Nutt. Man. v. i. p. 399. This species forms a connecting link between _Sylvicola_ and _Trichas_, having the long pointed wings of the former, and the general appearance of the latter, which it resembles, especially in its tail, which is neither emarginate, nor marked with the white spots seen on that of almost all the other Sylvicolæ, but which do not exist in the genus Trichas. Some of the Sylvicolæ are, in like manner, assimilated to Myiodoctes, and others to Vermivora. Of the former may be mentioned, _Sylvicola Auduboni_ and _S. coronata_; of the latter, _S. Blackburniæ_. GENUS III. TRICHAS, Swains. GROUND-WARBLER.