Until recently only one species of this genus was recognized in North America–Menopsimus caducus Dyar. In a paper of 1919, Synonymical Notes Relating to Menopsimus caducus Dyar (Proc. Ent. Soc. Wash., Vol. 51, No. 2, p. 74), Mr. J. G. Franclemont estabiished that caducus and fractilinea Sm. represent two distinct species, congeneric with the European one known as Tholomyges turfosalis Wocke, and showed that both Tholomyges Lederer and Menopsimus Dyar fall to Hypenodes Doubleday. Since that time, three more unnamed species have been found, bringing the total for North America to five. All of these, as far as is known, are restricted to the north-eastern region.