ICHNEUMON-FLIES, PART 2: EPHIALTINAE 39 



Upper valve of ovipositor with nodus rather weak (rarely absent) or only 

 moderately developed and with region beyond nodus transversely convex; 

 apex of lower valve with oblique ridges moderately to weakly elevated and 

 not distinctly arcuate 7 



6. Cheek about 0.5 as long as breadth of mandible at base; abdominal tergites 



with unusually large, distinct punctures; sheath with fine, rather short 

 hairs; base of stigma with a short, pale stripe . . 4. subtilis, new species 

 Cheek about 0.33 as long as breadth of mandible at base; abdominal tergites 

 with punctures smaller and often suberased or obscured by other sculpture; 

 sheath with coarse, rather long hairs; base of stigma uniformly fuscous or 

 with only a small, pale spot 5. vesicarius (Ratzeburg) 



7. Upper valve of ovipositor without a nodus (fig. 310,g); apex of lower valve 



smooth, except for a few, very minute ridges at the tip. Atrocoxalis 



group (p. 53) 7. atrocoxalis (Ashmead) 



Upper valve of ovipositor with a more or less distinct nodus; apex of lower 

 valve with numerous, distinct ridges. Hispae crotjp (p. 54) 8 



8. Stigma brownish with a narrow, pale yellowish or whitish border on all three 



sides; propodeum unusually short, and rather abruptly and strongly 

 declivous beyond middle; middle and hind coxae often more or less black. 



8. brevicornis (Gravenhorst) 



Stigma uniformly colored, without a narrow, pale yellowish or whitish border 



on all three sides; propodeum more elongate, with portion beyond middle 



more evenly and less strongly declivous; middle and hind coxae reddish, 



except in ienebrosus 9 



9. All coxae dark reddish brown or blackish; head rather thick; temple not 



receding for some distance behind eye; propodeum without dorsomedial 



carinae 10. tenebrosus, new species 



Middle and hind coxae reddish; head not especially thick; temple usually 

 receding behind eye; propodeum usually with short, dorsomedial carinae. 



10 



10. Hind tibia dull reddish more or less suffused with fuscous, with indistinct, 



darker fuscous, subbasal and apical suffusions; humeral angle of pronotum 



black or very narrowly piceous 9. canadensis, new species 



Hind tibia with a broad, median, whitish annulus and distinct brownish or 

 fuscous, subbasal and apical annuli; humeral angle of pronotum usually 

 with a distinct pale spot 11 



11. Front and middle tibiae with a conspicuous, pale stripe on upper side extend- 



ing to apex; hind tibia with pale annulus extending close to apex on upper 

 side and beneath interrupted by a broad, fuscous stripe that joins the sub- 

 basal and apical annuli; tergites usually more or less reddish; hind angle of 

 pronotum with a pale spot that usually extends forward as a short stripe 



along upper margin of pronotum 12. aplopappi (Ashmead) 



Front and middle tibiae with stripe on upper side usually less conspicuous and 

 not extending to apex; hind tibia with pale annulus not extending close to 

 apex on upper side and usually only narrowly or indistinctly interrupted 

 beneath; tergites without reddish markings, except in transgressus; pale 

 spot in hind angle of pronotum usually not produced as a short stripe along 

 upper margin of pronotum 12 



12. Stigma translucent yellowish brown 15. nucum (Ratzeburg) 



Stigma opaque brownish or blackish 13 



