U. flavlcornis, Fab

Sirex flavicomisj Fab. — Entomologia Systematica. Vol. 11, p. 126,

20 Lb Naturaliste Canadien.

Sirex Bizonatus, Steph. —British Entomology. Vol. VII, p. 114. — Kyrby, Fauna Boreali- Americana. Vol. IV, p. 256.

2. U. albicornis Fab. — Entomolc^ia Systematica. Vol. II, p. 127. — Harris, Injurious inscets p. 538.