A REVISION OF THE NORTH AMERICAN ICHNEUMON- 

 FLIES, BELONGING TO THE SUBFAMILIES NEONEURI- 

 NAE AND MICROGASTERINAE. 



By C. F, W. MUESEBECK, 



Of the Bureau of Entomology, United States Department of Agriculture. 



INTRODUCTION. 



This paper is a contribution from the Gipsy Moth and Brown-tail 

 Moth Branch of the Bureau of Entomology. It includes tables of the 

 known genera of the braconid subfamilies, Neoneurinae and Mlcro- 

 gasterinae, keys to the North American species, descriptions of new 

 species, and synonymical notes, also figures of the fore wing of repre- 

 sentative species of the North American genera known to me. 



The two subfamilies are incorporated in this paper, for the reason 

 that one or both of the genera, Neoneurus Haliday and Elasmo- 

 soma Ruthe, which constitute the subfamily NeoneuTinae^ have been 

 quite generally placed in the Microgastennae. This despite the recog- 

 nition by most workers in the Braconidae that both genera differ very 

 widely in many important respects from typical Microgasterinae. 

 Foerster ^ mentioned neither Neoneurus nor Elasmosonia., but included 

 in the Microgastennae a new genus, Ecclites., which Ashraead ^ sj'nony- 

 mized with Neoneurus Haliday. In his key to the Microgasterides 

 Marshall^ included Elasmosoma ; Neoneurus, however, he placed in 

 the Agathides. It will be recalled that Marshall regarded these two 

 groups as tribes of his division Areolaires. Ashmead^ was appar- 

 ently the first to recognize the close relationship of Neoneurus and 

 Elasmosoma. In suggesting that the Microgasterinae might be sus- 

 ceptible of tribal division, he indicated that under such an arrange- 

 ment these two genera would fall together. A few years later Szepli- 

 geti * again separated the two, holding Elasmosoma in the Microgas- 

 terinae, because of its incomplete radial cell, and placing Neoneurus 

 in the Agathid'mae, now the Braconlnae. Furthermore he stated^ 



No. 2436-Proceedings U. S. National Museum. Vol. 6!, Art. 15 



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