488 PROCEEDINGS OF THE ACADEMY OF [1893. 



anterior wings either truncate or pointed, the appendiculation usually 

 distinct ; three submarginal cells, the second of which receives both 

 recurrent veins ; .stigma larger, and consequently more distinct than in 

 Tachytes or Tachysphex ; cubital vein of hind wings originating be- 

 yond the apex of the submedian cell. Size medium. 



This genus is erected for a number of species which, although pos- 

 sessing the characters of each to a certain degree cannot be placed 

 either in Notogonia, Tachytes or Tachysphex. The emarginate 

 femora of the $ excludes them from Notogonia, the raised front 

 along inner eye-margins from Tachytes and Tachysphex and again 

 from Tachysphex by the shape of hind ocelli and stiff tarsal comb. 

 From Liris, which does not occur in this country, the emarginate 

 mandibles is sufficient to separate it. Ultimately, it seems to me, 

 that a number of genera, belonging to this group, will have to be 

 reduced to the value of sections as has been done with numerous 

 genera of the Sphecida? (s. s. ). This genus gives promise of being 

 one rich in species as eleven are treated of herein. 



FEMALES. 



1 — Space between eyes at top less than, or equal to, the length of 



antenna! joints 2 and 3 united 2 



Space between eyes at top decidedly greater than the length of 



antenna! joints 2 and 8 united 5 



2 — Space between eyes at top just about equal to the length of anten- 



nal joints 2 and 3 united 3 



Space between eyes at top less than the length of antennal joints 



2 and 3 united 4 



3 — Dorsulum finely and very closely punctured, opaque; anterior mar- 

 gin of clypeus with lateral angles strongly produced. . aurulenta. 

 Doisulum finely and somewhat sparsely punctured, shining; 



anterior margin of clypeus bidentate dolosa. 



4 — First joint of fiagellum not shorter than the second, if anything 

 slightly longer; lateral angles of anterior margin of clypeus 



strongly produced ; wings fuscous capax. 



First joint of fiagellum distinctly shorter than the second; later- 

 ally, the anterior margin of clypeus is usually bidentate; wings 

 clear (the abdomen varies from black to red and black) .... 



distincta. 



5 — Abdomen entirely black 6 



Abdomen more ar less red 8 



6 — Antennte longer than head and thorax united 7 



Antennae, when stretehed-out, but little longer than the head 

 and that part of thorax preceding the hind margin of tegulse; 

 form robust vegeta. 



