34 tr. S. NATIONAL MUSEUM BULLETIN 216 part 3 



6. Propodeum with lateral longitudinal carina distinct, more or less complete 



(fig. 308,a); pubescence of head and thorax very dense; apical margin of 

 clypeus truncate or somewhat concave, without a median tooth or lobe; 



nervellus broken near the middle 1. Apsilops (p. 37) 



Propodeum without lateral longitudinal carina; pubescence of head and 

 thorax varying from sparse to dense 7 



7. Middle part of mediella vein rather weakly to strongly arched (figs. 308,a to 



312,a); propodeal spiracle round to short elliptic; tergite 7 often with a 



large median white spot 8 



Middle part of mediella almost straight or weakly arched (figs. 312,b to 

 315, a) ; propodeal spiracle short elliptic to long and slitlike; tergite 7 without 

 a median white spot in any of the Nearctic species 13 



8. Sides of areolet parallel or weakly convergent (more strongly convergent in 



Agrothereutes pallipennis and A. alutarius), and the base of first tergite 

 with a lateral subtriangular projection opposite insertion of extensor 

 tendon (the projection weak in male, stronger in female) ; flagellum of male 



without a white band 9 



Sides of areolet definitely convergent and/or the base of first tergite without 

 a lateral subtriangular projection opposite insertion of extensor tendon; 

 fliagellum of male sometimes with a white band 10 



9. Mesoscutum polished or subpolished, rather strongly punctate, sometimes 



mat near notauli and margins or mat except for median part of its three 

 lobes; apical propodeal carina nearly always absent medially, just mesad 

 of the sublateral crest turned strongly forward; hind tibia often with a 



whitish basal band 2. Agrothereutes (p. 42) 



Mesoscutum mat, more or less punctate; apical propodeal carina complete 

 medially, the median portion turned only moderately forward; hind tibia 

 without a basal whitish band 3. Gambrus (p. 70) 



10. Clypeus weakly to moderately convex, its apical margin usually with a 



more or less distinct median point or lobe; sides of areolet subparallel or 

 convergent; base of first abdominal tergite usually without a lateral tri- 

 angular projection opposite insertion of extensor tendon 11 



Clypeus strongly convex (often pyramidal in profile), without a median 

 apical point or lobe; sides of areolet strongly convergent; base of first ab- 

 dominal tergite often with a lateral triangular projection opposite insertion 

 of extensor tendon 12 



11. Dorsolateral carina of first tergite usually distinct basad of spiracle; second re- 



current vein nearly straight or more or less sinuate (fig. 310,b), vertical 

 or somewhat inclivous; postpetiole rather weakly convex above; ovipositor 



strongly compressed 5. Aritranis (p. 98) 



Dorsolateral carina of first tergite absent or indistinct just basad of spiracle; 

 second recurrent vein strongly sinuate and reclivous (fig. 311, a) ; postpetiole 

 strongly convex above; ovipositor moderately compressed. 



6. Pycnocryptus (p. 126) 



12. Second tergite mat and with moderately dense, medium-sized punctures; 



mediella vein strongly arched; flagellum of male almost always with a 

 white band; base of first tergite with a subtriangular lateral projection at 

 level of insertion of extensor tendon, the projection weak in male, stronger 



in female 7. Ischnus (p. 131) 



Second tergite mat, not distinctly punctate; mediella vein rather weakly 

 to rather strongly arched; flagellum of male without a white band; base 

 of first tergite often without a lateral projection at level of insertion of 

 extensor tendon 8. Habrocryptoides (p. 165) 



