AMERICAN HYMENOPTERA. 37 



Posterior femora yellow, with a large central black spot, confluent with 

 lower edge which is narrowly black to apex; scutellum with a cen- 

 tral black stripe or basal spot : 

 Lower edge armed with six mostly large irregular teeth ; protuberance 



beneath posterior wing black and yellow 22. bracata. 



Lower edge armed with twelve mostly small irregular teeth; protuber- 

 ance beneath posterior wing entirely yellow Var. eorequalis. 



Markings of body and legs bright deep orange-yellow ; posterior femora with 

 a small black spot beneath near base; scutellum divided centrally 



by a black stripe 23. eucausta. 



Body ferruginous : 



Petiole of abdomen short: 



Abdomen ferruginous, immaculate ; head, metathorax, posterior coxse, tibise 



and petiole of abdomen black 24. barbara. 



Abdomen piceous-black, with two white spots; petiole pale yellowish ; pos- 

 terior coxse ferruginous, with a large black spot..25. Scutellaria. 

 Petiole of abdomen very long and slender : 



Scutellum ferruginous, with a central black stripe, the lateral margin 



whitish 26. debilis. 



Scutellum yellowish-ferruginous, with a large dorsal black 



mark 27. pel iolata. 



Body coccineous or scarlet : 

 Petiole of abdomen short : 



Posterior femora with about five short distant teeth; four anterior legs 



red 28. Lanieri. 



Posterior femora with numerous minute teeth; the four anterior legs 



black 29. coccinea. 



Petiole of abdomen very long and slender ; wings fuliginous, apical third sub- 

 hyaline; posterior femora immaculate, with numerous minute 



teeth 30. coecinata. 



Body fiery yellowish-red or orange : 



Wings dusky hyaline, darker towards base, the cubitus with a dark spot; 

 scutellum with a black dot at tip; posterior coxae with a black 



spot , 31. flammeola. 



Wings uniformly fusco-hyaline; scutellum immaculate; posterior coxa? with 



a broad exterior black stripe 32. intermedia. 



Wings clear hyaline; scutellum and metathorax with a central black stripe; 



posterior coxae with a black spot 33. iguea. 



Body lemon-yellow or luteous : 



Petiole of abdomen nearly as long as posterior coxse and slender; most of 

 head, mesothorax, scutellum, wings except apex, and abdomen ex- 

 cept base, black 34. miranda. 



Petiole of abdomen short, not more than half the length of posterior coxae: 

 Posterior femora with four teeth : 



Luteous; mesothorax reddish-brown, with two central luteous stripes; 

 scutellum with a large triangular reddish-brown spot: posterior 



coxse except base more or less sanguineous 35. Eubule. 



Lemon-yellow; disk of mesothorax black, immaculate; the flagellmn 

 black 30. dorsata. 



