AbstractGenetic similarity between species of rodents of theAkodongenus (A. dolores, A. molinae, andA. azarae) has been estimated by analysis of electrophoretic zymograms corresponding to 23 loci. Nei's coefficient betweenA. doloresandA. molinaewas within the range usually found in conspecific populations. This evidence plus the successful production of “hybrids” (Merani et al., J. Exp. Zool.,206:343–346, '78) suggests thatA. doloresandA. molinaemay represent geographic races of the same sp