506 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



separate the twelve known North American species, and are the char- 

 acters used in the following key: 



KEY TO SPECIEa. 



I. Antennae banded vdth white; head entirely black (male) viellipes Provancher. 

 Antennae unicolorous; face, at least in male, with yellow markings 2. 



2. Areolet wanting 3. 



Areolet present 5. 



3. Face rugose; palpi and tegulae yellow; ovipositor longer than body. 



Jlavipes (Provancher). 



Face smooth; palpi and tegulae, the latter at least apically, piceous; ovipositor 



shorter than body 4. 



4. Wings hyaline; clypeus so sharply inflexed as to appear truncate, with the 



median tooth very small minor Cushman. 



Wings yellowish; clypeus less sharply inflexed, with the median tooth broad 

 and obtuse niger Cushman. 



5. Thorax black 6. 



Thorax reddish brown 10. 



6. Coxae in female entirely red; abdomen black with tergites whitish at apices; 



male unknown harringtoni Cushman. 



Coxae black or piceous at least basally within (in male front and middle coxae 

 pale at apex, occasionally entirely pale and rarely the hind coxae are entirely 

 red) 7. 



7. Abdomen more or leas red; all coxae in female dark piceous red, blackish at base 



(in male the red is paler and the piceous more nearly black and the hind coxae 

 sometimes uniformly piceous); face in female usually maculate with yellowish, 



in male yellow but with clypeus black; tegulae reddish occidentalis Cresson. 



Abdomen usually entirely black (in known male, more or less piceous red in 

 middle) or with apical tergites white margined; all coxae in female and in 

 known male black; both face and clypeus in known male yellow 8. 



8. Inner orbits, tegulae and a spot in front, and stigma reddish; apical tergites mar- 



gined with whitish; ovipositor longer than body. (Male not known.) 



quebecensis Provancher. 

 Head in female entirely black; stigma except at base blackish; abdomen black, 

 occasionally piceous red in middle, tergites not margined with whitish; ovi- 

 positor shorter than body 9. 



9. Malar space in female barely two-thirds, in male less than half as long, as basal 



width of mandible; wings distinctly suffused with yellowish, especially basally; 

 areolet with petiole barely half as long as free portion of first intercubitus; 

 legs pale stramineo-testaceous, hind tibiae nearly black pettitii Cresson, 



Malar space in female nearly, in male fully, half as long as basal width of mandible;, 

 wings infumate, not yellowish basally; areolet with petiole nearly as long as 

 free portion of first intercubitus; legs dark rufo- testaceous, hind tibiae but little 



darker than femora manni Cushman. 



10. Wings very dark brownish with purplish reflections; hind tarsus not much paler 

 than tibia, latter not black apically; malar space much shorter than basal width 

 of mandibles; membraneous apical portion of tergites darker than chitinized 

 portion. (Female only) pulchripennis Cushman. 



Wings subhyaline; hind tarsus yellow, tibia infuscated at apex; malar space but 

 little shorter than basal width of mandible; membraneous portion of tergites 

 paler than chitinized portion 11. 



