Head, and all the upper parts of the body, olive-green: streak above the eye, and under parts, bright yellow: tail moderate.
M. flava, Ray, Syn. Av. p. 75. Yellow Wagtail, Mont. Orn. Diet, and Supp. Selb. Must. vol. i. p. 255. pl. 49. f. 3. Bew. Brit. Birds, vol. I. p. 229.
Entire length six inches eight lines: length of the bill (from the forehead) five lines and a half, (from the gape) eight lines; of the tarsus eleven lines; of the hind toe, claw included, eight lines and a half; of the tail two inches eleven lines; from the carpus to the end of the wing three inches: breadth, wings extended, nine inches nine lines.
(Male). Crown of the head, nape, and ear-coverts, pale olive-green; back, rump, and scapulars, of the same colour but darker: over the eyes a bright yellow streak: all the under parts bright yellow: quills and coverts blackish brown, edged and tipped with yellowish white: tail dusky; the two middle feathers edged with pale olive; the two outer ones with the whole of their external, and a large part of their inner webs white: bill and feet black. (Female). Upper plumage inclining more to cinereous: throat yellowish white; the rest of the under parts yellow, but not so bright as in the male. (Young of the year). Resembling the female, but still paler: upper parts dull cinereous, very faintly tinged with olivaceous: all the under parts yellowish white: greater and lesser coverts broadly tipped with white, forming two bars across the wings: tail as in the adult. (Egg). White, mottled nearly all over with yellow and ash-brown: long. diam. eight lines and a half; trans, diam. six lines and a half.
A migratory species, visiting this country about the end of March, or beginning of April. Frequents downs, and arable lands, and is rather less attached to water than either of the foregoing species. Nest placed on the ground; composed of dried stalks and fibres, and lined with hair. Eggs four or five in number.