Corvidæ.--Rooks, Ravens, Crows, Hooded Crows, Jackdaws, Choughs (or "Red-legged Crows").--_In Spring._--Hooded Crows and Ravens occasionally seen at N. Unst--resident? Also Raven occasionally seen there in March, April, September, October, and November, always one, two, three, or four, and therefore probably birds breeding, or reared on N. Unst main-island. In the same way Ravens occasionally seen at N. Ronaldshay, Pentland Skerries, etc., can only be looked upon as "on predatory quest intent." "Black Crows" at N. Unst are probably Rooks, usually "flying south" (if they come from E. turning south no doubt at Unst). We would like to feel sure if these Black Crows are Carrion Crows or Rooks; but "Rooks" by name are never mentioned at N. Unst. Indeed, "Rooks" by name are only mentioned by reporters from Pentland Skerries and Fidra, but "Black Crows" and "Crows" seem to have general application even at Isle of May. We would like Rooks distinguished from Carrion Crows _or_ Corbie Crows. The terms "Crows" and "Black Crows" might mean either the Carrion Crow or the Rook. [Those who have Johns' book will easily see the difference.--J. A. H.-B.] Considerable movements all through the year, extending from N. Unst southwards, of Hooded Crows and "Black Crows" and Rooks. Jackdaws visited Isle of May in a fog in April, and stayed all night of the 11th; and two had previously been seen on March 19th. Noticed also occasionally at Fidra. Heaviest appearances of _Corvidæ_ in October when migration was almost continuously heavy; lightest, however, at N. Unst; heaviest at Pentland Skerries 5th to 11th October. Continuous but much lighter returns from N. Unst, N. Ronaldshay, Pentland Skerries, and Fidra, in September, and curiously, none from Isle of May. Light returns again from N. Unst and Fidra in November, and only two from Pentland Skerries in December. The uniformity of time in rushes of almost all species is singular this season, October being the favoured month. Cypselidæ.--Swifts.--["Swallow Swift" of Isle of May returns.]--In spring or summer three "Swallow Swifts" at Isle of May, light, W., clear. No other records, except one on 3d May at same station. _In Autumn._--Two Swifts at Pentland Skerries catching insects round the tower; light, S.W. Cuculidæ.--Cuckoo.--Only one notice at Isle of May on 18th May.