1936-1939 32, 51, [1], 84, 12, 18, 32, 17, 150, 50, 28, 54 p., bound in two new cloth volumes (original printed covers bound in). Library stamps, else very good set. Groups treated are: Tiphiidae, Cephidae - Syntexidae, Pamphiliidae, Xyelidae, Trigonaloidae, Sirecidae, Xiphydriidae, Specidae I (Astatinae - Nyssoninae), Evaniidae, Aulacidae & Gasteruptiidae. Most are written by the editor of this series, Hans Franz paul Hedicke (1891-1949), the large part 8 (Sphecidae I. (Astatinae - Nyssoninae) is by F. Maidl.