NO. 2296. CERTAIN GENERA OF ICHNEUMON-FLIES—CUSHMAN. 375 



The wide divergence of opinion as to the placing of these genera 

 brings up the question of the availabihty of the first included species 

 as genotypes. The characters used in the present-day keys for the 

 separation of the subfamilies of Ichneumonidae leave much to the 

 discretion of the taxonomist in the placing of species. That Brischke 

 and Thomson or Davis and Ashmead should assign the same species 

 to different subfamilies need cause no surprise, nor does it constitute, 

 m the mind of the present writer, reason for declaring Oedemopsis 

 pulchricornis Brischke unavailable as genotype of Hyhoplianes nor 

 Tryphon ? nasutus Cresson as type of Campothretus and Rhyncho- 

 thyreus provided they agree with the original description of the 

 genera otherwise. Unfortunately TrypJimi ? nasutus does not agree 

 with the original description of Campoihreptus Foerster in that the 

 ovipositor is not hooked at the tip, and can therefore not function 

 as the type of that genus .^ This explains the synon3m-iizing of 

 Campoihreptus Davis but not Campoihreptus Foerster with Hyho- 

 phanes. 



The present writer is of the opinion that Thomson and Sclimiede- 

 knecht are more nearly correct in their placing of these three genera 

 than are any of the other writei"s. The only feature that they display 

 that is antagonistic to the Tryphoninae is the rather strongly exserted 

 ovipositor, and many of their other more important characters are 

 shared in by such genera as Eclytus Hohngren and Perilissus (Foer- 

 ster) Hohngren. In the Mesoleptini, where the petiolate abdomen 

 naturally places them, they, however, form a distinct group worthy 

 of at least subtribal rank. This disposition of the three genera 

 together with the new allied genus described below is followed here. 



DESCRIPTION OF SUBTRIBE THYMARIDINA SCHMIEDEKNECHT. 



Ovipositor exserted, at least as long as first tergite, sheath widened 

 gradually from base to beyond middle, where it abruptly narrows 

 (fig. 2c); head behind eyes broad; antennae slender, in female, 

 sometuTies in male, white annulate; mandibles narrowed toward 

 apex, upper tooth longer; pronotum with epomiae strong to dorsal 

 margin where they form an angle on each side; notauli distinct to 

 beyond middle of mesoscutum where they coalesce in an impressed 

 area; sternauh more or less distinctly indicated; propodeum com- 

 pletely, through sometimes weakly, areolated, areola usually long 

 and narrow, petiolar area short, at most embracing slightly less 

 than half the length of the propodeum; wings without an areolet; 

 radius originating beyond middle of stigma; second recurrent straight; 

 nervellus broken far below middle and distinctly antefurcal; legs 

 slender, claws minute, mutic; hind metatarsus at least as long as 

 three following joints united, last joint but little longer than penulti- 

 mate; fii'st tergite petiolate or subpetiolate, more or less decurved, 



» See discussion on this point In Proc. U. S. Nat. Mus., vol. 55, 1919, p. 518. 



