W. Meise prepared for the Eighth International Ornithological Congress at Oxford, 1934, a list of the new genera and species described between 1920 and 1934 (Proc. Eighth Int. Orn. Congr., Oxford: 90-189, 1938). He followed this four years later at the Ninth Congress at Rouen with a supplementary list of new species described since 1934. These lists have proven so useful that a similar list for the four-year period, 1938-1941, appears justifiable, even thought here is no International Congress to be held this year. J. T. Zimmer is responsible for the discussion of the New World species and E. Mayr for the Old World forms.