  In this note we identify and characterize the ultraviolet-infrared
color-magnitude relation of star-forming galaxies. The ultraviolet to
mid-infrared flux ratios of star-forming galaxies span over two orders of
magnitude and show a clear dependence on absolute magnitude from M_W3 ~ -13 to
M_W3 ~ -25, which may present problems for models of galaxy spectral energy
distributions that have been largely verified on ~L* galaxies. The
color-magnitude relation of star-forming galaxies illustrates the broadband
spectral diversity of star-forming galaxies that results from established
correlations between the physical properties and mass, including the
mass-metallicity relation.
