REVISIOiN OF THE NORTH AMERICAN MOTHS OF THE SUB- 

 FAMILY EUCOSMINAE OF THE FAMILY OLETHREUTIDAE. 



By Carl Heinrich, 



0/ the Bureau of Entomology, United States Department of Agriculture. 



INTRODUCTION. 



The present paper is the result of several years' study of the family 

 Olethreutidae. It is based chiefly on the collections of the United 

 States National Museum, the American Museum of Natural History, 

 and of Dr. William Barnes, of Decatur, Illinois. Through the cour- 

 tesy of the American Museum I have been able to study and arrange 

 the Kearfott material and to make genitalia slides of such species as 

 were not represented by authentically determined specimens in the 

 United States National Museum. Wherever possible the genitalia of 

 the type specimen — where the latter was a male and available — 

 were examined and mounted on slides. Genitalia slides were made of 

 every species represented by males in the National Collection, and in 

 many cases several slides were made of a species, especially of doubt- 

 ful or variable forms. Doctor Barnes has loaned the National Mu- 

 seum the whole of his unworked material, and both he and the Ameri- 

 can Museum have contributed liberally to the National Collection. 

 The three collections are being arranged to conform to the system 

 herein proposed, and at present represent, with the exceptions noted 

 in the text, the complete described North American fauna in this 

 group. I have also examined the Zeller types in the Museum of 

 Comparative Zoology and the Clemens types in Philadelphia, and 

 Dr. Henry Fernald has kindly allowed me to study the collection of 

 his father at Amherst, Massachusetts. 



I am also indebted to Dr. W. T. M. Forbes for some valuable sug- 

 gestions. Mr. August Busck, at whose suggestion I undertook the 

 revision of the Olethreutidae, has given me his notes on the Walsing- 

 ham types in the British Museum and has helped at every stage by 

 criticism and suggestion. Indeed, without the support of his mature 

 and comprehensive knowledge it would have been impossible to have 

 accomplished anything with this most difficult group. The present 

 preliminarjT paper is a complement to his revision of the Tortricidae 



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