EUMENE3. 



335 



b. Apex of median segment simple, not 



dentate E. indiana, p. 338. 



B. ]\Iedian segment convex, vertical, with a 



slight groove down the middle, gi'oove not 

 or scarcely broadened at apex. 



a. Abdomen up to apex of 2nd segment 



punctured and granular in appearance. 

 a . Second abdominal segment without a 

 lateral yellow spot. 

 a^. Legs black, variegated with yellow . E. urchitectus, p. 339. 



b-. Legs ferruginous " E. humbertiana, p. 338. 



b'. Second abdominal segment with a 



lateral yellow spot . . .' E. ptmctata, p. 339. 



b. Abdomen smooth, slightly shining E. affinissima, p. 340. 



C. Median segment convex, vertical, with a 



well-marked groove down the middle, 

 widening at apex into a deep A-shaped 

 hollow. 

 a. Petiole long, gradually widening to the 

 apex, longer, never shorter than the 

 thorax and median segment united, 

 medially with well-developed prominent 

 lateral tubercles 

 a'. Large, robust ; length over 25 mm. 

 d^. Second and following abdominal 

 segments wholly black above ; 2nd 

 segment sometimes with a lateral 



red spot at base E. circinalis, p. 340. 



b"^. Second abdominal segment wholly 



black, following segments red .... E. xanthura,"^. '&^\. 

 (p-. Second abdominal segment red or 

 blackish at base, apical half and 



following segments yellow E. petiolata, p. 341. 



cP. Second abdominal segment red at 



base, apical half and following [p. 342. 



segments black E. dimidiatipennis, 



b'. Smaller, more slender ; length under 

 25 mm. 

 a^. Second abdominal segment red at 

 base, with a black transverse medial 

 band, the apical third yellow. 

 a'. Sides of the median segment pos- 

 teriorly red ; fore wing always 

 with a subapical fuscous spot. ... E. esuriens, p. 342. 

 b^. Sides of the median segment 

 yellow posteriorly ; fore wing 

 without a subapical fuscous spot . E. gracilis, p. 343. 

 6^. Second abdominal segment red at 

 base with a black transverse medial 

 band, apical margin and following 



segments red E. conica, p. 343. 



c'^. Second abdominal segment red at 

 base with a medial black band, 

 apical margin yellow, following 

 segments red E. elegans, p. 344. 



