Four new dimeric naphthopyrones, fonsecinones A (7), B(8), C(9), and D(10), and two known ones, aurosperones A (6) and B(11), were isolated from Aspergillus fonsecaeus (N.R.R.L. 67, 0 16-1). Naphthopyrones have been isolated from a variety of fungi, e.g. rubrofusarin (1) from Fusarium culmorum, 1-3 Fusarium gramineum1-3 and Aspergillus niger,4 flavasperone (3) from A. niger,4-6 Aspergillus awamori6 and Aspergillus fonsecaeus (N.R.R.L., N^0 67), 5 and the dimeric aurosperones A (6) and B (11) from A, niger and A, awamori, 4,6,7 The presence of naphthopyrones in the extractives of fruits infected by A. niger was also established by Ghosal et al. Because of their toxicity, such materials may provide high toxin risk in mon.4 Raper and Fennell9 described an ultraviolet mutant (O 16-1) of Aspergillus fonsecaeus (N.R.R.L. 67), a fungus closely related to A. niger, which was characterized by a rich deposit of yellow pigment. A previous investigation established the occurrence of fonsecin (4), fonsecin B (5) and rubrofusarin B (2) in this material. 10, 11 This report deals with the isolation and characterization of six further pigments from the some source. Extensive TLC over Si gel of the EtOAc extracts of dried mycelium of Aspergillus fonsecaeus (N.R.R.L. 67, O 16-1) afforded the new dimeric naphthopyrones, named as fonsecinones A (7), B (8), C (9) and D (10), in addition to two known ones, viz. aurosperones A (6) and B (11). Their structure was evident fram inspection of their spectroscopic parameters, particularly PMR characteristics (Table 2). Comparison with standard spectra (Table I) and use of a pair of solvents facilitated proton shift assignments.