Abstract
During the course of genetic studies of Aphiochaeta sp. the author has obtained twenty some mutants. Some occured naturally and others as the result of X-ray irradiation. The mode of inheritance is more or less irregular in most cases. Some of those mutated genes have been definitely located on the chromosomes, for instance, short arista (sa°) and Delta on the third chromosome, anb bar and truncate (main gene) on the second.
