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L. 0. Howard. Revision of the Aphelininae of North America. Tech [[strikethrough]] nical [[/strikethrough]] Ser [[strikethrough]] ies [[/strikethrough]] No. 1, Div [[strikethrough]] ision of [[/strikethrough]] Ent [[strikethrough]] omology [[/strikethrough]] ,U. S. Dept. Agric [[strikethrough]] ulture [[/strikethrough]] pp. 1-44, 14 Figs. A complete monograph of the North American species of one subfamily of the Chalcid parasitic flies. Introductory chapters [[strikethrough]] ; [[/strikethrough]] treat on the economic importance of this group and their host relations, and a list is also given of the described European species. Analytical tables to the genera and species are presented [[strikethrough]] 10 [[/strikethrough]] Ten genera and 29 species are recognized in our fauna, of which 2 genera and 7 species are here described as new. [[strikethrough]] 14 excellent woodcuts, some original and some reproduced from "Insect Life", illustrate the principal types. 14 figs. [[/strikethrough]] L. 0. Howard. The Grass and Grain Joint-worm flies and their allies: a consideration of some North American Phytophagic Eurytominae. Tech [[strikethrough]] nical [[/strikethrough]] Ser [[strikethrough]] ies [[/strikethrough]] No. 2, Div [[strikethrough]] ision of [[/strikethrough]] Ent [[strikethrough]] omology [[/strikethrough]] , U. S. Dept. Agric [[strikethrough]] ulture [[/strikethrough]], pp. 1-24, 10 Figs. Treats on the species of Phytophagic Eurytominae that have been reared and whose life history is known. There are 5 genera and 20 species, of which 14 species are described as new. [[strikethrough]] 10 excellent woodcuts, all original, illustrate the principal forms. [[strikethrough]] 10 Figs. [[/strikethrough]]