The genus Jassus is a very large genus of leafhoppers known to occur over a very large portion of the earth. Many species have been described from India, Africa, Central and South America, the Phillipines and several other countries. A very few species, however, seem to occur in America north of Mexico. Since only one of these species is well known, two but slightly known, and two apparently new to science, the writer feels that a short paper introducing us to the small part of the genus known to occur in the United States would not be out of place. A paper on the other American species is being prepared and should be ready for publication before long.