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We identify a population of Luminous Compact Blue Galaxies (LCBGs) in twogalaxy clusters: MS0451.6-0305 (z=0.54) and Cl1604+4304 (z=0.9). LCBGs areidentified via photometric characteristics and photometric redshifts derivedfrom broad and narrow band images taken with the WIYN telescope and the HubbleSpace Telescope. We analyze their surface densities and clustering propertiesto find they compose a statistically significant portion (42% and 53%) of theButcher-Oemler galaxies in both clusters, and their spatial distributions arebest characterized by a shell model. The enhancement of the projectedspace-density of LCBGs with M_B<-18.5 in the clusters relative to the field is3-10 times higher than the BO population as a whole, but 2 times lower than thered population, except in the core where LCBGs are absent. Assuming somefading, a natural descendant would be small, low-luminosity galaxies foundpreferentially in today's clusters, such as dEs.Comment: 10 Pages, 3 figures, accepted for publication in ApJ Letter

Luminous Compact Blue Galaxies in Intermediate-Redshift Galaxy Clusters: A Significant but Extreme Butcher-Oemler Population