1992-2000 Six volumes. xvii, 122, xv, 160, xvii, 171, xviii, 206, xvi, 314, viii, 163 p., 1517 figures, 174 coloured plates (photographs of specimens), paperbound. Library stamps and removed sticker mark, else good set. These volumes include a wealth of new species and taxonomic changes and a great iconography. Unfortunately the first volumes are becoming very scarce.