On three occasions only has the Aquatic Warbler been recognised in England. One taken at Hove, near Brighton, in October, 1853, is in the collection of Mr. Borrer;[23] a second, in my possession, was killed near Loughborough, in the summer of 1864;[24] and a third, believed to have been obtained near Dover, is in the Dover Museum.[25] This bird resembles the Sedge Warbler in size and general appearance, but, in addition to the light stripe over each eye, it differs in having a light stripe down the centre of the forehead; this, being very distinct, furnishes a good means of identifying it readily. The species has been figured by Dr. Bree in his “Birds of Europe,” to which work the reader may be referred for further information and a more detailed description. I may supplement his remarks, however, by saying that Lord Lilford found it common in Corfu in May, and at Nice in August and September;[26] and that Mr. T. Drake met with it in March in Tangier and Eastern Morocco.[27] Now that its occasional presence in this country has been detected, ornithologists should look out for it between April and September, and scrutinize every Sedge-bird they see, on the chance of meeting with the rarer species. THE MARSH WARBLER. (_Salicaria palustris._) In appearance this bird resembles the common Reed Warbler, just as the Aquatic Warbler resembles the Sedge-bird. It is one of the plain-backed species, and similarity in appearance as well as in habits causes it doubtless to be overlooked or mistaken for the commoner bird. From its general resemblance to the Reed Warbler, _Salicaria strepera_[28] (Vieillot), it has no doubt been overlooked; but when its distinguishing characters have been duly noted it will in all probability be found to be a regular summer migrant to this country. Dr. Bree, when treating of this species in his “Birds of Europe,” says (vol. ii. p. 74): “I think it very probable that this bird is an inhabitant of Great Britain, though hitherto confounded with the Reed Warbler. I think I have myself taken the nest; and Mr. Sweet’s bird, mentioned by Mr. Yarrell, was probably this species.” In the “Zoologist” for 1861, p. 7755, the occurrence of the Marsh Warbler in Great Britain was recorded by Mr. Saville, who procured a single specimen, subsequently identified by Mr. Gould, and saw others in Wicken Fen, Cambridgeshire. He says: “My attention was first attracted to this species some time since, during a visit to our fens, by the marked difference in the song of a bird somewhat similar in appearance to the true _S. arundinacea_ (i. e., _strepera_); it was louder, clearer, and sweeter-toned than that of the last-named. Its mode of flight, too, was more undulated and quicker. It was more shy and timid, continually retreating to the thickest covert. Never, so far as my experience goes, does it emit notes similar to the syllables ‘chee-chee-chee’ so common to _S. arundinacea_.”