8 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.64. 



26. (20) Pygidium with diverging striae 30. aeetis Fox. 



Pygidium with longitudinal striae 27 



27. Apex of second abdominal tergite fringed with silvery pubescence, except 



a small, black spot medially 32. ociilata Banks. 



Apex of second abdominal tergite fringed with a broad band of black 

 pubescence 31. simillima Smith. 



Males. 



1. Size small, 3-5 mm 2 



Size large, 7-20 mm 4 



2. Postero-lateral angles of head dentate 1. canadensis Blake. 



Postero-lateral angles of head rounded or obtuse 3 



3. Head quadrate, the punctures sparse, coarse, evenly distributed. 



5. glla Blake. 

 Head transverse, the punctures fine, sparse and irregularly distributed. 



3. uthamas Fox. 



4. Pubescence of abdomen above, fiery red or golden 5 



Pubescence of abdomen above, white or black S 



'5. p]ach abdominal tergite with an apical band of fiery red pubescence. 



38. vanduzei Bradley. 

 Abdominal tergites 3-5, at least, with an apical band of golden pubes- 

 cence 6 



6. Abdomen castaneous, second tergite yellowish; tegulae coarsely punc- 



tate throughout; second abdominal tergite with fine, sparse punc- 

 tures 24. flavida Blake. 



Abdomen entirely black 7 



7. Humeral angles rounded, punctate, without any evidence of a carina ; 



dorsum of thorax usually yellowish 35. propinqua Cresson. 



Humeral angles carinate, thorax black 21. aureovestita Bradley. 



8. (4) Second dorsal segment of abdomen red 9 



Body entirely black 13 



9. Posterior part of tegulae bent downward so as to form a posterior face 



at a sharp angle with tlie dorsal surface 10 



Tegulae convex, without a posterior face 12 



10. Femora densely clothed beneath with long hairs 23. oceola Blake. 



Femora sparsely pubescent beneath 11 



11. Tegulae rugosely punctate throughout; sixth and seventh tergites with 



whitish pubescence 29. scrupulosa, new species. 



Tegulae sparsely punctate, shining; all the tergites with black pu- 

 bescence 31. simillima Smith. 



12. Body clothed with pale pubescence 39. russeola, new species. 



Body clothed with black pubescence 34. sanbornii Cresson. 



13. (8) Body clothed with pale pubescence 15 



Body clothed with black pubescence 14 



14. Sides of propodeum rugoso-striate 25. mgricula, new species. 



Sides of propodeum rugoso-punctate 18. anthracina Fox. 



15. Abdominal tergites with a distinct apical band of pale pubescence 16 



Abdominal tergites without a distinct apical band of pale pubescence. 



33. genjon Fox, 



16. Tegulae subhemispherical, with a distinct posterior face; wings sub- 



fuscous 37. carhonaria, new species. 



Tegulae convex, without a distinct posterior face 17 



17. Frontal tubercles at insertion of antennae densely punctate. 



40. aegaeon Fox. 



