ON THE GENERA OF THE ICHNEUMON-FLIES OF THE 

 TRIBE PANISCINI ASHMEAD, WITH DESCRIPTIONS AND 

 DISCUSSION OF RELATED GENERA AND SPECIES 



By R. A. CusHMAN, 



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



This paper is a review of the genera included by Ashmead and 

 others in the tribe Paniscini, In the opinion of the writer most of 

 these genera are not related to Paniscus but are more or less anom- 

 alous representatives of several groups, placed together because of 

 general superficial resemblance to each other. Each genus is placed 

 in what seems to the writer to be its natural position, with reasons 

 assigned for this placing. The greater part of the paper consists of 

 a study of certain genera of the Tryphonine subtribe Mesoleiina and 

 a review of the North American representatives of the restricted 

 tribe Paniscini. 



The genera Paniscus Schrank, Opheltes Holmgren, and Ahsyrtus 

 Holmgren were placed by Holmgren in close proximity with OpMon, 

 and here they have been considered to belong by practically all 

 subsequent workers, Ashmead^ finally grouping them with three 

 other genera to form the tribe Paniscini. But Thomson^ dissented 

 from this placing and insisted that they should be referred to the 

 Tryphoninae in close proximity to Perilissus, pointing out the char- 

 acters wherein they resemble the latter subfamily much more closely 

 than the Ophioninae. Chief among these is the form of the first 

 abdominal segment and the position of its spiracle. Thomson was, 

 in my opinion, much nearer the truth in regard to the relationship 

 of these genera than were the others, but with his placing of them 

 within the subfamily I do not agree, as will appear later. 



The tribe Paniscini of Ashmead, as originally constituted, included 

 the genera Paniscus (Gravenhorst [sic!]) Schrank, Ahsyrtus Holm- 

 gren, OpJieltes Holmgren, Parabates Foerster, CidapJius Foerster, and 



1 Proc. U. S. Nat. Mus., vol. 23, 1900, p. 95. 



sOpusc. Ent., fasc. 9, 1883, p. 873; fasc. 12, 1888, pp. 1185 and 1193. 



No. 2510.— Proceedings U. S. National Museum, Vol. 64, Art. 20. 



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