Eight pericentric inversions on chromosome 3 of Anopheles albimanus were isolated and characterized. Two of these inversions are viable in homozygous condition and should prove useful in genetic crosses as crossover suppressors. An analysis of the inversion breakpoints, for the present inversions and others studied previously, showed that the regions near the free ends of chromosome 3 were more subject to breakage. A brief discussion is presented on the potential usefulness of inversions for the genetic control of An. albimanus.