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We report on the hybridization of mouse chromosomal paints to Apodemus sylvaticus, the long-tailed field mouse. The mouse paints detected 38 conserved segments in the Apodemus karyotype. Together with the species reported here there are now six species of rodents mapped with Mus musculus painting probes. A parsimony analysis indicated that the syntenies of nine M. musculus chromosomes were most likely already formed in the muroid ancestor: 3, 4, 7, 9, 14, 18, 19, X and Y. The widespread occurrence of syntenic segment associations of mouse chromosomes 1/17, 2/13, 7/19, 10/17, 11/16, 12/17 and 13/15 suggests that these associations were ancestral syntenies for muroid rodents. The muroid ancestral karyotype probably had a diploid number of about 2n = 54. It would be desirable to have a richer phylogenetic array of species before any final conclusions are drawn about the Muridae ancestral karyotype. The ancestral karyotype presented here should be considered as a working hypothesis.

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di Pisa. ' . VERRIL A. E., 1882 -Notice of the remarkable farina occupying the outer banks 08 the southern coast of New England, N o 7, and of some additions to the fazina of Vineyard Soiimd. Amer. Journ. Sci., ser. 3, 23: 360-371. ostricoli. Thalassia, 2 (1): 1-24. citeriore osservati vivi negli anai 1822-1830. Tomi I-V, Napoli. Natur. Fr. Berlin (N.F.), 5: 129-135. faunistically related regions. Stud. Fauna Curagao, 26: 1-133.