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 



