A REVISION OF THE NORTH AMERICAN ICHNEUMON- 

 FLIES OF THE SUBFAMILY OPIINAE. 



B_y A. B. Gahan, 



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



It is the intention to present, in the following pages, a synoptic 

 revision of the Braconid subfamily Opiinae for North America, 

 including only those Mexican and West Indian species the types or 

 paratypes of which are in the United States National Museum. 

 Keys to genera and species are accompanied by descriptions of 

 nineteen new species, together with some notes on described forms. 



With the exception of seven species described by H. L. Viereck, 

 the types of which are in the Snow collection at the University of 

 Kansas and not obtainable, type or paratype specimens of all the 

 described species have been studied. Through Prof. S. J. Hunter, 

 entomologist of Kansas University, notes on the Viereck types were 

 obtained which, together with the original descriptions, have per- 

 mitted the placing of these species in the keys. 



Thanks are due and are cheerfully accorded to the Rev. V. A. 

 Huard, of the Provincial Museum, Quebec, Canada, for the loan of the 

 Provancher types, and to Prof. S. J. Hunter for the notes already 

 referred to. 



Superfamily ICHNEUMONOIDEA. 



Family BRACONIDAE. 



Subfamily OPIINAE. 



1862. Opioidae Foerster, family 24, Verb. d. Naturh. ver-Preuss. Rheinl. , vol. 19, 



pp. 229, 258. 

 1885. Opiides Marshall, Trans. Ent. Soc. London, p. 11. 



1887. Opiinae Cresson, Syn. Hym. North America, pp. 56, 61. 



1888. Opiidae Marshall, Spec. d. Hym. d. Eur., vol. 4, p. 67. 

 1901. Opiinae Ashmead, Proc. U. S. Nat. Mus., vol. 23, pp. 112, 133. 



1904. Opiinae Szepligeti, Wytsman's Genera Insectonim, Braconidae, pp. 5 

 and 158. 



Head transverse; occiput (except in the genus Ademon) never 

 completely margmed though usually margined at the sides; mandi- 

 bles crossing at the tips and bi-dentate at apex; clypeus either fitting 



Proceedings U. S. National Museum, Vol. 49— No. 2095. 



63 



