Oceanodroma leucorrhoa leucorrhoa
Mathew rather surprisingly described it as a not very rare visitor in stormy weather. He gives no definite records, and only one has been recorded in the fifty years, picked up at Pembroke Dock, 12 Nov 1931, and sent to the National Museum of Wales.
R.M.Lockley, G.C.S.Ingram, H.M.Salmon, 1949, The Birds of Pembrokeshire, The West Wales Field Society