8 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.63. 



7. Ocelli very small, the greatest diameter of a lateral ocellus only half, or less than 



half, the length of the ocell-ocular line, very rarely a little larger, and then 

 radial cell exceptionally long, the radius going to extreme apex of wing, and 



the first abscissa of radius about equal to second 10 



Ocelli larger, the ocell-ocular line not nearly twice as long as diameter of an 

 ocellus; radius always reaching margin much before extreme apex of wing 8 



8. Pro- and mesopleura mostly smooth and shining, the latter with a longitudinal 



crenulate furrow; the ventral margins of first abdominal tergite widely sepa- 

 rated; the venter of petiole at base rather coarsely roughened; second abscissa 

 of radius usually nearly as long as the second intercubitus; ovipositor sheaths 

 about half as long as the abdomen; stigma, in female, wholly pale yellow, in the 



male usually brown; antennae with 33-36 segments 6. communis (Cresson). 



Propleura closely, finely rugulose, and not so shining; ventral margins of first 

 abdominal tergite not so widely separated, sometimes meeting; venter of petiole 

 at base not so coarsely roughened, usually very smooth; ovipositor sheaths 

 about two-thirds as long as the abdomen or longer; stigma, in both sexes, brown 

 except along anterior margin; antennae of females with 29-32 segments, of 

 males with 29-35 segments 9 



9. Posterior decli\'ity of propodeum rather abrupt and distinctly hollowed out 



medially; eyes very large, the face narrow, the malar space exceedingly short; 

 second abscissa of radius usually but little longer than first abscissa and only 

 half as long as first intercubitus; o\apositor sheaths three-foiu-ths as long as the 



abdomen; male antennae -with 29-32 segments. ... f. 7. indagator (Riley). 



Posterior declivity of propodeum not so abrupt nor so conspicuously hollowed 

 out medially; face broader, at least as broad at base of clypeus as long between 

 insertion of antennae and base of clypeus; second abscissa of radius usually 

 about twice as long as the first, and distinctly more than half as long as first 

 intercubitus ; ovipositor sheaths two-thirds as long as the abdomen ; male antennae 

 with 33-35 segments 8, loxostegei Viereck. 



10. "Wings distinctly a little infumated; lower abscissa of basella usually longer than 



nervellus 11 



Wings hyaline, occasionally with a faint yellowish tint; lower abscissa of basella 

 very rarely longer than nervellus 14 



11. Thorax usually stout; first abdominal tergite with rather coarse striae and strongly 



shining; first discoidal cell petiolate, the petiole unusually long, longer than 

 first abscissa of radius; ovipositor sheaths two-tliirds as long as the abdomen 



9. politus (Provancher). 



Thorax very slender; first abdominal tergite finely closely ruguloso-striate or 

 punctato-striate and opaque; petiole of first discoidal cell much shorter; ovi- 

 positor sheaths at least three- fourths as long as the abdomen; al)domen very 

 slender 12 



12. First abscissa of radius only one-third as long as second; recurrent vein inter- 



stitial with first intercubitus; petiolar fossae very small; ovipositor sheaths a 

 little longer than the abdomen; a very small species, less than 3 mm. in length 



10. provancheri Dalla Torre. 



First abscissa of radius at least half as long as second; recurrent vein entering 

 first cubital cell; petiolar fossae rather large; o\'ipositor sheaths never longer, 

 usually distinctly a little shorter, than the abdomen 13 



13. Lower abscissa of basella decidedly longer than upper abscissa and at least one 



and one-half times as long as nervellus; vertex of head and mesonotal lobes 

 finely shallowly punctate; the very large eyes of the female strongly conver- 

 gent, the face very narrow, narrower at base of clypeus than long between 



insertion of antennae and base of clypeus 11. angustipennis new species. 



Lower abscissa of basella shorter than upper abscissa and very little longer than 

 nervellus; vertex and mesonotal lobes polished; face of female not so narrow, 

 distinctly broader at base of clypeus than long between insertion of antennae 

 and base of clypeus 12. fumipennis, new species. 



