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 Felt at the New York State Museum, and T. H. Frison at the Illinois State Laboratory of Natural History.

Mr. L. H. Weld, of East Falls Church, Virginia, who has contributed some data from his own and the National Museum collections.

The following who have made outstanding contributions of insects and galls: the late F. A. Leach of Piedmont, California; Dr. J. T. Patterson of the University of Texas; Dr. Ralph Voris of the Southwestern Missouri Teachers College; Miss Pauline Schulthess and Miss Dorothy Hildebrand of Kelseyville, California; Mrs. W. E. Smith of Picayune, Mississippi; Miss O. Buchanan of Eddyville, Illinois; B. and H. J. Pack of Salt Lake City, Utah; Dr. Charles Sajo of Oerszentmiklos, Hungary; Dr. Ed. Baudys of Brno, Czecho-Slovakia; W. E. Noury of Bois Guilbert par Buchy, France; E. B. Hoffmeyer of Havdrup, Denmark; and possibly a hundred other collectors, many of them collectors of important material, each item of which is duly credited with the distribution and other data in the systematic portion of this paper.

Several who have borne the burden of the technical work involved in the preparation of the insects, drawings, and manuscript for this study: W. H. Vance, Mrs. I. T. Wilson, Miss F. D. Flemion, Miss E. Arnold, Miss L. F. Ritterskamp, Miss Z. E. Gross, Mrs. R. Voris, Mrs. H. P. Wright, C. J. Quick, and Miss E. E. Wilkinson; especially Miss L. F. Ritterskamp who has been directly in charge of the technical work during the past three years.

The Zoölogy Faculty at the Ohio State University, who allowed me the use of their library facilities.

The John Crerar Library, at Chicago, which has given me free access to their superb collection of scientific volumes.

The Indianapolis Engraving Company, who are responsible for the photographs of galls reproduced herewith.