ICHNEUMON-FLIES — GELINAE : MESOSTENINI 183 



26. Lower half of frous polished, not wrinkled, with a deep pit dorsolaterad of 



each antennal socket; wrinkling on mesopleurum irregular, not longi- 

 tudinal; hind femur moderately slender; first segment of female flagellum 



about 5.5 as long as wide 14. dorsicarinatus (Pratt) 



Lower half of frons transversely wrinkled, with a shallow pit dorsolaterad 

 of each antennal socket; wrinkling on mesopleurum longitudinal, weakly 

 so in male, strongh^ so in female; hind femur rather stout; first segment 

 of female flagellum about 4.1 as long as wide 27 



27. Coxae black; temple at its midheight weakly convex. 



15. lochmaius, new species 

 Coxae fulvous; temple at its midheight almost or quite flat. 



16. strigosus (Pratt) 



28. Abdomen black; propodeal spiracle about 1.2 to 1.8 as long as wide . ... 29 

 Abdomen mostly or entirely red, ferruginous, or fulvous; propodeal spiracle 



usually more than 1.8 as long as wide 30 



29. Front side of areolet about 0.7 as long as outer side; ovipositor about 2.8 



as long from nodus to apex as it is deep at nodus; apex of hind femur not 



fuscous 18. luctuosus (Cresson) 



Front side of areolet about 0.5 as long as outer side; ovipositor about 4.0 as 

 long from nodus to apex as it is deep at nodus; apex of hind femur fuscous 

 in the American subspecies, not or very weakly infuscate in the European 

 subspecies 19. nioschator (Fabricius) 



30. Cheek about 1.7 as long as basal width of mandible; head and thorax with 



long, erect, dark brown hair; epomia lacking . . 20. arcticus (Schi0dte) 



Cheek about 1.0 as long as basal width of mandible; head and thorax with 



moderately short, appressed, usually pale hair; epomia present, usually 



itrong 31 



31. Mesoscutum with wrinkling along the notauli which partly obscures them, 



the notauli not sharp except anteriorly; flagellum of female often marked 



with white on segments 4 and 5 21. riigosiscutum (Pratt) 



MesoscutuiB without wrinkling along the notauli or with only a little wrin- 

 kling, the notauli sharp to beyond center of mesoscutum; flagellum not 

 marked with white except in females of krombeini and crassulus ... 32 



32. Second recurrent vein with a simple arch; longitudinal carinae of first ab- 



dominal tergite rather weak; postpetiole rather narrow (especially in female) . 

 This couplet will have to be used with care, and with doubtful specimens 



a trial run through both halves 33 



Second recurrent vein faintly to strongly sinuate, its upper half more strongly 

 curved than its lower half and at the middle with some straighting of the 

 curve or a reverse curvature; longitudinal carinae of first abdominal tergite 

 moderately strong; postpetiole rather wide (especially in female) ... 34 



33. Ovipositor sheath about 0.44 as long as front wing; ovipositor straight; face 



of male more or less yellow medially; punctures on mesoscutum very 



fine and dense 22. aridus (Pratt) 



Ovipositor sheath about 0.78 as long as front wing; ovipositor gently up- 

 curved; face of male black medially; punctures on mesoscutum moderately 

 fine and dense 23. recurvatus (Pratt) 



34. Temple rather long, its hind 0.45 strongly convex and its front 0.55 weakly 



convex or almost flat; hind femur about 4.7 as long as deep 35 



Temple short to moderately long, varying from almost flat to moderately 

 convex, at least at its midheight, the convexity uniform throughout its 

 length; hind femur 4.6 to 7.0 as long as deep 37 



