Ichneumon-Flies 

 of America North of Mexico 



Henry and Marjorie Townes 



Introduction 



This series of taxonomic monographs on the ichneumon flies of 

 America North of Mexico, is being prepared under a project sup- 

 ported by the Dow Chemical Company, the University of Michigan, 

 and the National Science Foundation. 



The basic financial support for this work has come from the Dow 

 Chemical Company. The University of Michigan has given working 

 space and facilities, and a grant from the National Science Founda- 

 tion has met such costs as travel, typing, and the preparation of 

 figures. We are grateful for the opportunity thus provided for 

 carrying the work forward. 



Numerous colleagues and the collectors of earlier generations have 

 accumulated a mass of material which has made a reasonably com- 

 plete record of our fauna possible. Some of the more important 

 collections were made by C. F. Baker in Colorado and elsewhere; 

 Nathan Banks in Virginia and Massachusetts; P. P. Babiy at Ithaca, 

 N. Y.; G. E. Bohart and R. M. Bohart in California and Utah; 

 J. C. Bradley in British Columbia, California, and New York; Frank 

 De Gant in Ohio; R. R. Dreisbach in Michigan and other States; 

 P. W. Fattig in Georgia; H. R. Foxlee at Robson, B. C; R. M. Fouts 

 in the vicinity of the District of Columbia; J. N. Knull in Ohio and 

 elsewhere; W. R. M. Mason in Canada, particularly in the far north; 

 A. L. Melander in the northwestern States; C. E. Mickel in Minne- 

 sota; J. G. Rempel in Saskatchewan; H. C. Severin in South Dakota; 

 A. T. Slosson on Mount Washington, N. H.; H. H. Smith in Alabama 

 and Pennsylvania; E. H. Strickland in Alberta; David Townes in 

 Arizona, California, Colorado, and Alaska; George Townes in Cali- 

 fornia, Colorado, and South Carolina; E. P. Van Duzee near Buffalo, 

 N. Y.; and G. S. Walley in Canada. The names of some of the many 

 other collectors appear in the statements on the distribution of the 

 various species. The combined efforts of these collectors, together 



