State Geological and Natural History Survey.
(State of Connecticut. Public Document No. 47.) Vol. v., Bulletin 22. Guide to the Insects of Connecticut. Part iii. The Hymenoptera or Wasp-like Insects of Connecticut. By H. L. Viereck., with the collaboration of A. D, MacGillivray, C. T. Brues, W. M. Wheeler, and S. A. Rohmer. Pp. 824 + plates x. (Hartford: Printed for the State Geological and Natural History Survey, 1916.)