As has been already stated, the Stonechat may be found in a few scattered pairs throughout the country all the year round. At the beginning of April, however, a considerable accession to its numbers is observed to take place, owing to a migration from the south and south-east. It takes up its residence on moors and heaths, and many a lonely walk over such ground is enlivened by the sprightly actions and sharp “_chook-chook_” of this little bird. The male in his wedding dress, with jet black head, white collar, and ferruginous breast, is extremely handsome; and the artist who is fond of depicting bird-life would scarcely find a prettier subject than a male Stonechat in this plumage upon a spray of furze in full bloom. In Ireland the Stonechat is considered to be a resident species, and this is attributed by Mr. Thompson to the mild winters of that island. In Scotland, on the contrary, Sir Wm. Jardine has observed that the Stonechat is not nearly so abundant as either the Whinchat or the Wheatear, and frequents localities of a more wild and secluded character. It ranges, however, to the extreme north of the mainland of Scotland, and is included by Dr. Dewar in his list of birds which he found nesting in the Hebrides. It is said not to breed in either Orkney or Shetland.[4] The geographical range of the Stonechat is rather more extensive than that of the Whinchat, for besides being found throughout the greater part of Europe to the Mediterranean, it goes by way of Senegal to South Africa, and extends eastward through Asia Minor, Palestine, and Persia, to India and Japan. In Europe, however, its distribution is somewhat remarkable, inasmuch as it is confined chiefly to the central and southern portions of the continent, and in Norway and Sweden is unknown. The Whinchat, on the other hand, breeds in these countries, and has been met with as far north as Archangel. In winter the male Stonechat loses the black head, and the colours in both sexes are much less vivid than in summer. Here again, as with the Wheatear, the change of plumage seems to be effected by a change of colour in the same feathers, and not by a moult. _Apropos_ of this subject, the reader may be referred to an article contributed by me to the Natural History columns of “The Field,” 16th September, 1871, on variation of colour in birds. [Illustration: WOOD WARBLER] THE WOOD WARBLER. (_Phylloscopus sibilatrix._) Although often taken to comprehend every species of warbler, Professor Newton has recently shown[5] that the genus _Sylvia_ of Latham should be restricted to the group of fruit-eating warblers next to be described, and that the generic term which has priority for the willow wren group is _Phylloscopus_ of Boie.