1917] A Synopsis of Eumenidce 347 



4. Punctation on the ventral aspect of the tergite of the petiole extending 

 up to the margin before the apical broadening of the stemite; a trans- 

 verse brownish band crossing the middle of the dorsal aspect of the - 



second segment of the gaster smilhii Saussure 



Punctation on the ventral aspect of the tergite of the petiole not extend- 

 ing up to the margin, except after the apical broadening of the sternite; 

 a transverse yellowish band, (sometimes interrupted], crossing the 

 middle of the dorsal aspect of the second segment of the gaster 5 



o. A largely brownish wasp belfragei Cresson 



Brownish, replaced by yellow or golden. . . .belfragei subspecies aureus Isely 



6. vSecond segment of the gaster depressed (wider than high) or if not 



_ distinctly depressed the dorsal angle is surmounted by a boss 7 



Second segment of the gaster compressed, or if not distinctly so the 

 dorsal angle is without a boss 10 



7. Apical emargination of the clypeus shallow, but angular; second segment 



of the gaster with the dorsal line after the dorsal angle nearly straight 

 with no broad transverse depression before the apex. . .slenogaster Isely 

 Apical emargination of the clypeus rounded; second segment of the gaster 

 with the dorsal line after the dorsal angle recurved and with a broad 

 transverse depression before the apex 8 



8. Second segment of the gaster beyond the lateral angles with the sides 



parallel, not convergent until near the apex, segment longer than wide. 



bolliformis Viereck 

 Second segment of the gaster beyond the lateral angles with the sides 

 convergent, not longer than wide 9 



9. Apical cordon of the petiole not prominent, no distinct constriction 



immediately preceding it; abdomen largely yellow. . .crucifera Provancher 

 Apical cordon of the petiole prominent, with distinct constriction 

 immediately preceding it; abdomen largely black sternalis Isely 



10. Antennae comparatively short and stout, reaching about to the tegula;; 



petiole not more than twice as long as wide; sides of the prothorax 



before the tegulae concave or contracted 18 



Antennae not especially short and stout, as long or nearly as long as the 

 thorax; petiole more than twice as long as wide; prothorax little if 

 ever contracted before the tegulae 11 



11. Dorsal angle of the second segment of the gaster surmounted by a boss; 



dorsal line recurved apically 12 



Dorsal angle of the second segment of the gaster rounded and without 

 a boss; dorsal line not recurved apically '. 13 



12. Second segment of the gaster with two yellow bands, one of which is 



interrupted cruciferorum Viereck 



Second segment of the gaster with three yellow bands, two of which are 

 ■ _ ^ interrupted dorsally tricinctus Isely 



13. Second segment of the gaster about half as wide again as the petiole. 



enigmatus Viereck 

 Second segment of the gaster at lea.st twice as wide as the petiole 14 



14. Lateral angles of the clypeus about the same distance from base and 



apex 15 



Lateral angles of the clypeus about twice as far from the base as from 

 the apex; surface of the clypeus coarsely, punctate 17 



15. Surface of the clypeus; finely punctate; petiole with lateral teeth visible 



when viewed dorsally; second segment of the gaster somewhat flattened 

 dorsally, with dorsal and lateral angles distinct; markings yellowish- 

 white globulosus vSaussure 



Surface of the clypeus coarsely punctate; petiole with lateral teeth not 

 visible when the insect is viewed dorsally; second segment of the gaster 

 convex, with dorsal and lateral angles indistinct, about a third longer 

 than wide; markings bright yellow robustus Isely 



Surface of the clypeus finely punctate; petiole with lateral teeth usually 

 visible when viewed donsally; second segment of the gaster convex with 

 lateral and dorsal angles indistinct, segment short, little if any longer 

 than wide; markings yellow 16 



