NEPIONEMA, A NEMATINE SAWFLY GENUS NEW TO NORTH-AMERICA, AND AN UNUSUAL NEW SPECIES OF NEMATUS (HYMENOPTERA, TENTHREDINIDAE)

Nepionema is reported in North America for the first time, and the second species in the genus, N. appalachiana, n. sp., is described from specimens discovered in West Virginia. The genus was previously known by only a single species from the European Alps. Nematus radialis, n. sp., is described from Virginia and West Virginia. It represents the first species of Nematus to possess a radial crossvein in the forewing. This crossvein is present in the female but absent in the male.