SUMMARY: A new species of Debaryomyces has been isolated from the air. It is characterized by a four-spored ascus, the production of a pellicle, lack of pseudo- mycelium, and the ability to assimilate glucose, sucrose, maltose and galactose but not lactose.* It has been named Debaryomyces marama. In the course of a survey of aerial yeasts, made with a Manning slit sampler, fifteen strains of a hitherto undescribed species of Debaryomyces were isolated. It is proposed to name this species D. marama, from the Maori adjective ' marama ' meaning ' light, not dark '.