

Memoirs 



OF THE 



American Entomological Society 



Number I 



THE CRESSON TYPES OF HYMENOPTERA 



By Ezra Townsend Cresson 



This paper contains a complete list of the species of Hymen- 

 optera described by the author, arranged alphabetically under 

 each family, with reference to the original description, sex, num- 

 ber of the type-specimen, as recorded in the catalogue of types 

 in the collection of the American Entomological Society, locality 

 and condition of the specimens as found during the winter of 

 1 913-14; and as the collections are carefully looked after, there 

 is likely no change in their condition at the time of the publication 

 of this paper. 



In selecting the single type the author has been governed by 

 the present condition of the original material, and has always 

 selected the perfect, or more nearly perfect specimen. 



No notice has been taken of synonymy; the genera, given in 

 parenthesis, after the species, being those under which they were 

 originally described. 



Unless otherwise stated, the type-specimens are in the Collec- 

 tion of the American Entomological Society, at the Academy of 

 Natural Sciences, Philadelphia, Pa. 



The Belfrage Collection is in the United States National ? u- 

 seum, Washington, D. C, and the author is greatly indebt a" to 

 Mr. J. C. Crawford and Mr. S. A. Rohwer for data as f , type 

 numbers, and condition of the specimens as found by aem in 

 August, 1 9 1 4 . 



MEM. AM. ENT. SOC, I. 



