ICHNEUMON-FLIES — GELINAE : MESOSTENINI 437 



5. Temple weakly convex; ovipositor sheath about 0.93 as long as front wing; 



abdomen entirelj^ ferruginous, except for base of its first segment. 



2. liogaster, new species 



Temple strongly convex; ovipositor sheath about 0.57 as long as front wing; 



abdomen black apically 4. melanurus Cushman 



6. Propodeum and metapleurum black, with large white marks; punctures on 



second tergite separated by about 6 times their diameter. 



10. angustus Townes 



Propodeum and metapleurum entirely fulvous or fulvous and black, or rarely 



entirely black 7 



7. Apical carina of propodeum complete, not interrupted medially; punctures 



on second tergite separated by about 5.0 their diameter; areolet about 1.0 



as wide as high 9. eisenii Ashmead 



Apical carina of propodeum interrupted medially; punctures on second ter- 

 gite separated by about 0.75 to 1.5 theur diameter; areolet about 1.3 to 

 2.0 as wide as high 8 



8. Upper end of prepectal carina sharp to about lower 0.3 of hind margin of 



pronotum, where it ends or is obsolescent in an elliptic white callus; ovi- 

 positor about 11.5 as long from nodus to apex as it is deep at nodus; post- 



scutellum white 7. sicarius, new species 



Upper end of prepectal carina sharp to about upper 0.4 of hind margin of 

 pronotum, there being no white area or callus at its upper end; ovipositor 

 about 4.5 to 7.0 as long from nodus to apex as it is deep at nodus . . 9 



9. Ovipositor about 4.5 as long from nodus to apex as it is deep at nodus; post- 



scutellum white; thorax unusually stout; apical carina of propodeum form- 

 ing strong, moderately oblique sublateral crests . . 8. thoracicus Cresson 



Ovipositor about 6.3 or 7.0 as long from nodus to apex as it is deep at nodus; 

 postscutellum black, or rarely white; thorax of normal slenderness for the 

 genus; apical carina of propodeum forming very weak, strongly oblique 



sublateral crests 10 



10. Ovipositor about 7.0 as long from nodus to apex as it is deep at nodus; pro- 

 podeum basad of its basal carina usually fulvous or mostly so; front wing 

 3.6 to 6.7 mm. long; frons with a weak median carina. 



5. gracilis Cresson 



Ovipositor about 6.3 as long from nodus to apex as it is deep at nodus; pro- 

 podeum basad of its basal carina largely black; front wing 5.0 to 8.5 mm. 

 long; frons with a median compressed ridge. . 6. clitellatus, new species 



1. Mesostenus albinotatus Gravenhorst 



Front wing 2.7 to 6.8 mm. long; clypeus small, strongly convex, its 

 apical margin strongly arcuate; temple weakly convex; prepectal 

 carina ending just above middle of hind margin of pronotum, some- 

 times traceable more dorsad to the subtegular ridge but usually not; 

 punctures on mesopleurum of moderate size, strong, most of those 

 above the middle separated by about 0.7 their diameter, those near 

 and just below the middle very crowded and usually obscured or 

 obliterated by rugulosity; apical carina of propodeum usually sharp 

 throughout, weaker medially and laterally and somethnes obsolete 

 medially, the median portion projected forward as a broad U or V 

 which is usually round-bottomed in male and square-bottomed in fc- 



