254 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



Ocellocular line much longer than diameter of an ocellus and 

 nearly or quite as long as postocellar line; petiole not dis- 

 tinctly constricted; nervulus usually distinctly postfurcal 40 



40. Antenna stout, much shorter than body, tapering but not 



attenuate at apex, basal joint of flagellum hardly four times 

 as long as thick, middle joints nearly as thick as long; apical 

 portion of clypeus shining, very faintly sculptured; claws in 

 both sexes distinctly pectinate (ovipositor sheath fully half 

 as long as first tergite; head and thorax immaculate black, 



abdomen usually ferruginous, rarely black) 41 



Antenna slender, nearly as long as body, attenuate at apex, 

 basal joint of flagellum more than four times as long as thick; 

 apical portion of clypeus usually dull; claws in female rarely 

 even weakly pectinate, in male simple 44 



41. Abdomen largely and hind femur usually ferruginous 42 



Abdomen and hind legs black 43. coloradensis, new species 



42. Malar space hardly half as long as basal width of mandible; 



first tergite black only at extreme base 40. zelotypu8 Cresson 



Malar space distinctly more than half as long as basal width of 

 mandible; first tergite largely or entirely black 43 



43. Hind femur red; second tergite entirely red-. 41. erythrogaster, new species 

 Hind femur black, second tergite largely black. 42. concoloripss, new species 



44. Malar space not or barely half as long as basal width of man- 



dible; cheeks in front view convex; mouth distinctly broader 

 than face; clypeus rather short and nearly as broad as face, 

 with a strong, straight transverse ridge; temples strongly 

 convex (ovipositor sheath not, or barely, half as long as first 



segment; black with abdomen red) 45 



Malar space distinctly more than half as long as basal width of 

 mandible; cheeks in front view rarely convex; mouth hardly 

 broader than width of face (if distinctly broader, the eyes are 

 strongly convergent and the face is narrow); clypeus rarely 

 strongly ridged and then much narrower than face; temples 

 flat or weakly convex 46 



45. Hind femur black 44. a fRnis Cresson 



Hind femur red 45. alternatipes, new species 



46. Second recurrent vein nearly straight; face more than twice as 



broad as long and broader than length of the slightly con- 

 vergent eyes; ocellocular line nearly three times as long as 

 diameter of an ocellus; inner hind calcarium distinctly less 

 than half as long as basi tarsus; head and thorax with dense 

 long erect hair; abdomen short and stout (body and legs 



black; wings dark) 46. deuteromaurus Dalla Torre 



Second recurrent strongly curved or flexed; face not or barely 

 twice as broad as long and usually narrower than length of 

 eye; ocellocular line at most a little more than twice as long 

 as diameter of an ocellus; inner hind calcarium fully half as 

 long as basitarsus; head and thorax not conspicuously hairy; 

 abdomen not especially short and stout 47 



47. Eyes parallel, l)arely as long as width of face; head in front view 



not constricted below eyes; extended angle of cheeks nearly a 

 right angle; clypeus small and with a distinct transverse 

 ridge; antenna in female with about 80, in male with 65 or 



