26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



Venation of hind wing not as above; parapsidal furrows nearly always en- 

 tirely polished; mesopleural furrow smooth, not foveolate, usually very 

 weak 14. 



14. Face elongate, rostrif orm or subrostriform, usually fully as long from anten- 



nal foramina to apex of clypeus as broad; clypeus long; malar space not 

 strongly inclining inwardly and usually at least two-thirds as long as the 

 eyes; cheeks not bulging; head strongly hollowed out behind; third seg- 

 ment of labial palpi not especially short 15. 



Face not elongate, distinctl.y broader than long from antennal foramina to 

 apex of clypeus; clypeus twice as broad as long; malar space strongly in- 

 clining inwardly and usually much shorter; third segment of labial palpi 

 usually much reduced, sometimes minute 19. 



15. First abdominal tergite polished, not striate between the dorsal keels; second 



and following tergites also polished; thorax mostly testaceous; the meso- 

 scutum always testaceous; propodeum usually smooth, not completely 

 areolated, with only a long narrow median area and indistinctly defined 



basal lateral areas 16. 



First abdominal tergite usually striate or striato-granular; if smooth, then 

 mesoscutum is more or less black; thorax varying from mostly testaceous 

 to entirely black; propodeum usually more completely areolated with the 

 transverse apical carina nearly always distinct 17. 



16. Antenna normally 34 to 36 segmented; parapsidal furrows indicated, the 



mesonotal lobes weakly defined; the ridge between antennae prominent 

 and descending rather abruptly behind; first abscissa of mediella slightly 



shorter than the second; legs completely black 13. atripes (Cresson). 



Antenna normallj' 25 to 29 segmented; parapsidal furrows wanting, the 

 lobes not defined; the ridge between antennae not so high nor descend- 

 ing abruptly behind; first abscissa of mediella rarely distinctly shorter 

 than the second; legs usually more or less marked with yellow 



14. nigripes (Cresson). 



17. First abdominal tergite, usually the second, and sometimes the third, more 



or less striate or striato-granular; propodeum usually rather completely 

 areolated, with two nearly parallel median longitudinal carinae enclosing 

 a long narrow median area and the petiolarea, and with the basal lateral 

 and apical lateral areas usually delimited; wings uniformly infumated; 



thorax usually more or less red 18. 



First abdominal tergite smooth and polished, with the two dorsal keels 

 usually not extending to the middle of the tergite; propodeum mostly 

 smooth, with a broad poorly defined median area that is open behind; 

 petiolarea and lateral areas not delimited; wings very nearly hyaline; thorax 

 entirely black; first abdominal tergite black except at apex 



15. bakeri, new species. 



18. Antennae stout at base, tapering distinctly to the apex; first abdominal ter- 



gite fully as broad at apex as long and longitudinally wrinkled; remainder 

 of abdomen polished; thorax stout; elevated lines on propodeum very 

 prominent; length normally about 7 to 8 mm. 



16. crassicornis, new species. 

 Antennae slender, not tapering to the apex; second and third abdominal 



tergitos sometimes more or less sculptured; length usually 3.5 to 5 mm. 



17. perforator (Provancher). 



