THE UNIVERSITY OF KANSAS SCIENCE BULLETIN Vol. 53, No. 6, pp. 275-356 A Revision of Venturia North of Central America (Hymenoptera: Ichneumonidae)^ D. B. Wahl2 Contents Introduction 275 Acknowledgements 276 Materials, Methods, and Terminology 276 Taxonomic History 280 Biology 282 Relationships of Venturia to other genera 283 Relationships within Venturia 286 Key to females 288 Key to males 294 Descriptions of species 296 Literature cited 338 Figures 13-26 340 Abstract The porizontine genus Venturia is revised for America north of Central America. Fifty-two species were found within this area, forty-one of which were previously undescribed. Keys, descriptions and illustrations are given for all species. A phylogenetic analysis using the methods of Hennig was performed. Difficulties involving identification of the outgroup and the apparent presence of extensive homoplasy led to the discovery of only three monophyletic groups containing a total of sixteen species. The interrelationships of the remaining species, and of the three monophyletic groups, remain unresolved. Introduction Central America. They are chiefly para-sitoids of microlepidoptera that feed in Venturia is a large genus of porizontine concealed situations (leaf rolls, buds, and ichneumonids, distributed worldwide but cases) but some are known or inferred to with the New World being one of the areas parasitize exposed larvae. Mixed meso-of greatest diversity. This study deals with phytic environments harbor the greatest the 52 species found in America north of number of species, although the genus is ' Contribution number 1989 from the Department of Entomology, University of Kansas, Lawrence, Kansas 66045, U.S.A. -Present Address: American Entomological Institute, 3005 SW 56th Ave., Gainesville, Florida 32608, U.S.A.