A new mutation [image] (misty) has been found in M. musculus. Misty is a dark-eyed coat diluting character not allelomorphic to other known dark-eyed dilutions, the albino alleles c e and c ch, leaden lnln or blue dilution dd mmbbaa and mmBBaa mice are more uniform and more intense in color than lnlnbbaa, lnlnBBaa, or ddbbaa and ddBBaa mice. Microscopic examination of the hairs shows mm individuals to have much more cortical pigment than dd or lnln mice on both bbaa and BBaa backgrounds.