NORTH AMERICAN ICHNEUMON-FLIES OF THE 

 GENERA CLISTOPYGA AND SCHIZOPYGA.^ 



By R. A. CUSHMAN, 



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



In a recent paper under joint authorship of the present writer 

 and S. A. Rohwer reviewing Hellen's revision of the Pimplinae* 

 the authors revised their previous placing ^ of the genus Schisopyga 

 Gravenhorse to the extent of admitting it to the subfamily Ichneu- 

 moninae, but expressing no opinion as to which of the tribes recog- 

 nized by themselves it should be referred to. In their own revision 

 of the tribes ^ (p. 392) they referred Clistopyga Gravenhorst to the 

 tribe Ichneumonini. 



Subsequent study of these two genera has convinced them* that 

 both should be referred to the Polysphinctini. Since the tribal keys 

 in the paper cited were written with the idea of excluding both 

 genera from this tribe, neither will run there, though it was realized 

 at the time that Clistopyga would undoubtedly cause trouble at this 

 point. In order to make the two genera fall in the Polysphinctini in 

 the classification of Cushman and Rohwer, it is necessary to revise 

 couplets 5 and 8 of the " Key to tribes based on females " ^ (pp. 388- 

 391) and couplets 2 and 12 of the "Key to tribes "^ (pp. 391-392). 

 The keys thus revised are given below. 



KEY TO TRIBES BASED ON FEMALES. 



1. Ovipositor with a dorsal notch a short distance back from apex; (internal parasites 



of Lepidopterous larvae), fig. 1 2. 



Ovipositor mthont piirh a notch 3. 



s^ 



FiG.l.— Apices of ovipositors: a, Gltpta simplicipes Cresson; 6, Lampronota Americana Ckesson; 

 c, Arenetra ntgrita Walsh; i, Meniscus scutellaris Cresson; e, Cylloceria lugubri.^ Cresson; 

 /, Lampronota frigida Cresson; ^, Lissonota verberans Gravenhorst; /, Ameesibia prionoxy 

 sTi Rohwer. 



' This paper is supplementary to the writer's revision of the tribe Polysphictini as 

 published in Proc. U. S. Nat. Mus., vol. 58, 1920, pp. 13—38, and is the sixth in the 

 series of papers by the present writer and S. A. Rohwer dealing with the Nortb American 

 species of the subfamily Ichneumoninae (Pimplinae of Ashmead). 



2 Cushman, R. A., and Rohwer, S. A., Ins. Mens., vol. 8, 1920, pp. 161-164. 



"Cushman, R. A., and Rohwer, S. A., Proc. U. S. Nat. Mus., vol. 57, 1920, p. 396. 



* The third person pronoun is used here with the approval of Mr. Rohwer. 



» Proc. U. S. Nat. Mus., vol. 57. 



No. 2399— Proceedings U. S. National Museum, Vol. 60, Art. 4. 



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