9-' 



TRANSACTIONS 



OF THE 



AMERICAN ENTOMOLOGICAL SOCIETY. 



VOLUNIE XXXVIII. 



THE ICHNEUMON FLIES OF AMERICA BELONG- 

 ING TO THE TRIBE OPHIONINI. 



BY CHARLES W. HOOKER, PH.D., 

 Of the Massachusetts Agricultural College, Amherst, Mass. 



INTRODUCTION. 



This paper forms the major part of a thesis for the degree 

 of doctor of philosophy at the Massachusetts Agricultural 

 College, where it has been prepared under the supervision 

 of Prof. Charles H. and Dr. Henry T. Fernald. To both, for 

 the many ways in which they have guided and encouraged 

 me in the work, I give my sincere thanks. 



The investigations contained in this paper are based upon 

 the extensive collections of the United States National Mu- 

 seum and the American Entomological Society in Philadel- 

 phia. In addition to these the collections of the New York 

 State Museum, the American Museum of Natural History, the 

 Boston Society of Natural History, the Brooklyn Museum, 

 the Leland Stanford, Jr. University ; the New Hampshire, 

 Minnesota, Montana and Colorado State Agricultural Col- 

 leges ; the North Carolina Department of Agriculture, the 

 Pennsylvania Department of Agriculture, Division of Zool- 

 ogy, the Boll Weevil Laboratory of the Bureau of Ento- 

 mology, U. S. Department of Agriculture, at Dallas, Texas, 

 and other smaller collections have been carefully examined. 

 All but four of the types existing in America, so far as 

 known, have been examined and descriptions prepared di- 



TRANS. AM. ENT. SOC, XXXVIII. (1) 



