28 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.69 



26. Antenna normally 23 to 27 segmented; propodeum and metapleura usually 



red; very often mesopectus, mesopleura, and more or less of propleura red; 

 mesoscutum always black or blackish; second abdominal tergite often 



mostly striate 25. buttricki Viereck. 



Antenna normally 29 to 33 segmented; thorax varying from entirely black 

 to entirely reddish testaceous; propodeum and pectus rarely pale, and 

 then the mesoscutum is always testaceous; second tergite never mostly 

 striate 26. bicolor (Provancher). 



27. First abdominal tergite, often the second, and sometimes the third finely 



evenly granular or faintly reticulate; metapleura and hind coxae often 



finely granular and opaque 35. 



First abdominal tergite usually, and sometimes the second, more or less longi- 

 tudinally striate or rugulose, never evenly granular; metapleura never 

 evenly granular 28, 



28. Malar space short, distinctly less than half as long as the eyes; clypeus only 



slightly convex, short and broad, more than twice as broad as long; face 

 rather flat; clypeal foveae not below the level of the lower margin of the 



eyes; occiput not strongly excavated 33. 



Malar space about half, or more than half, as long as the eyes; clypeus 

 usually long and strongly convex, sometimes elevated anteriorly; clypeal 

 foveae nearly always below the level of the lower eye margin; head strong- 

 ly hollowed out behind 29. 



29. Thorax testaceous or ferruginous, with the propodeum and pectus sometimes 



more or less black; abdomen at most black apically; second and follow- 

 ing tergites completely polished; face very broad, not rostriform 30. 



Thorax entirely black; abdomen usually black or with the second segment 

 ferruginous, rarely abdomen mostly ferruginous; second abdominal tergite 

 often more or less rugulose or irregularly striate; face usually rostriform 

 or subrostriform 31. 



30. Posterior tibiae with a flange like expansion outwardly at apex; posterior 



basitarsus distinctly less than half as long as posterior tibia; upper mar- 

 gin of eyes distinctly below the vertex; propodeum finely rugulose, with 

 two more or less distinct widely-separated median longitudinal carinae; 

 all coxae testaceous; ovipostor sheaths a little longer than the body 



27. laticeps, new species. 



Posterior tibiae without such apical expansion; posterior basitarsus more 



than half as long as posterior tibia; eyes attaining the vertex; propodeum 



rugose, without a distinct elongate median area; anterior and middle 



coxae blackish; ovipositor sheaths distinctly shorter than the body 



28. terminatus (Cresson). 



31. Labial i^alpi short, the tliird segment very short and'^much narrower than 



the fourth; tarsal claws with a large broad basal tooth; second cubital cell 

 triangular, the second abscissa of radius usually not distinct; malar space 

 usually about half as long as the eyes; first and second abdominal tergites 

 nearly always closely ruguloso-striate; wings nearly hyaline; abdomen 



varying from entirely black to mostly ferruginous 29. gibbosus Say. 



Labial palpi elongate, the third segment not especially short and narrov/; 

 tarsal claws with the basal tooth small or indistinct; second cubital cell 

 usually four-sided, the second abscissa of radius usually distinct though 

 short; malar space usually three-fourths as long as the eyes; first abdom- 

 inal tergite usually more or less striate, the second sometimes irregularly 

 striate; abdomen black, very rarely the second tergite tinged with red- 

 dish 32. 



