PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM issued l(S&?t\y\„ QfMi iy (he SMITHSONIAN INSTITUTION U. S. NATIONAL MUSEUM Vol. 84 Washington: 1937 No. 3017 REVISION OF THE NORTH AMERICAN SPECIES OF ICHNEUMON-FLIES OF THE GENUS EXETASTES GRAV-ENHORST By R. A, CusHMAN Bureau of Entomology and Plant Quarantine, United States Department of Agriculture This paper is a revision of the known species of Exetastes of North America north of Mexico. Tliirty-five names of North American species have been used in combination with Exetastes or represent species belonging to the genus. One of these is a nomen nudum. Elimination of those erroneously referred to the genus and the nomen nudum and the synonymizing of others leave 21 properly referable to Exetastes. Of these I find two names preoccupied, for which I pro-pose substitute names. Three of the 21 I consider to represent varieties of a fourth. The status of each of the 35 names is discussed on later pages. To the 18 species and 3 varieties 38 new species and 1 new variety are added in the present revision. HISTORY Aside from the description of species, the genus Exetastes has received rather scant attention from North American taxonomists. The only keys published are that of Provancher to eight Canadian species and that of Viereck to three Connecticut species. In 1828 Say described Ichneumon bifasciatus and in 1836 Banchus nervidus, both of wliich were transferred to Exetastes in 1921 by Cushman and Gahan. 120981—37 1 243
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