Color−magnitude diagram of the early-type galaxies in the central region of the Virgo cluster (Smith Castelli et al. 2013), showing the location of the dSph galaxies presented in this work (asterisks and open star) assuming they are at the distances of NGC 3193 and/or HCG 44. We also include the galaxies reported by Makarov et al. (2015; filled stars), Müller et al. (2015; filled triangles), and Ludwig et al. (2012; big open circles). The symbols code for Virgo galaxies is the same as in Fig. 4. The big vertical error bar represents the mean error in (g′−r′) (0.05 mag) for all galaxies included in the plot, excepting the LSB galaxies reported in this work.