E. hystrix, a new sp. for the U. S., has been known to occur on timothy in New Jersey since 1938, and is now spread over the entire state. Little is known of its life history and habits. The most promising control measure for the mite is pulverized Ca cyanamid and sulfur dust. Cyanamid acts as a contact poison to the mite and also as a fertilizer for the crop. Sulfur destroys a large % of the mites but does not increase the crop as does cyanamid. Rotenone dust did not prove effective against the mite. Oil emulsions and 2 dinitro compounds in dust form cause severe reductions in yield. Burning over the timothy fields before growth begins in the spring has proven unsatisfactory.