58 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 75 



14. Middle femur dentate bidentata. 



Middle femur plain, or with a single tooth near the apical end bordering 



a well-defined notch 15. 



15. Middle femur plain ; seventh tergite black tenuifasciata. 



Middle femur with tooth bordering a deep notch at apex; seventh tergite 



ferruginous mobii. 



IG. Seventh sternite conspicuously narrowed; process on sixth sternite a 



rounded, transverse swelling stenebdoma. 



Seventh sternite normal ; process on sixth otherwise 17. 



17. Dorsum of abdomen almost wholly pale mediterranea. 



Dorsum of abdomen bearing only fasciae, of which the first may be inter- 

 rupted or reduced to lateral spots 18. 



18. Middle femur dentate below on apical half torosa. 



Middle femur plain 19. 



19. Terminal segment of antenna curved and truncate, its posterior apical 



angle pointed (fig. 162) ; seventh tergite black quinquispinosa. 



Terminal segment of antenna not specially modified ; apex of seventh 

 tergite maculated , pugillatrix, 



20. Spine of eighth sternite ending in two points persimilis. 



Spine of eighth sternite ending in a single point 21. 



21. Anterior tibia bearing on inner side near apical end a slight depression 



between two black spots, the mort distal one cup-sliaped tenebrosa. 



Anterior tibia not bearing such characters 22. 



22. Middle metatarsus bearing a distinct lobelike dilation or swelling on its 



inner surface, usually at the middle or near the proximal end 23. 



Middle metatarsus without such dilation or swelling 20. 



23. Basal part of wing infumated ; apical part clear 24. 



Wings clear, or uniformly infumated more or less 25. 



24. Fasciae on tergites 1-5 yellow; sternites ferruginous doriae. 



Fasciae on tergites 1-5 pale; only sternites 2 and 6 marked with fer- 

 ruginous fuscipennis 



25. Second sternite bearing a central ferruginous area ; slender, less than 20 



mm. in length stevensoni. 



Second sternite without ferruginous area ; stout, 20 mm. or more in 

 lengtli , refuscata. 



26. Middle femur serrate or dentate (in some cases only two or three teeth 



near distal end) 27. 



Middle femur not serrate or dentate, smooth 67. 



27. Second and sixth sternites without distinct processes (in some species the 



second sternite may bear a more or less evident carina and the sixth may 

 or may not bear a median blunt protuberance suggestive of a process) _28. 



Second sternite plain or weakly carinate ; sixth with small median process 

 and a pair of small lateral processes near the apex of the segment. 



insularis. 



Second sternite with distinct process ; sixth plain sinuata. 



Second and sixth sternites with processes more or less well developed 36. 



28. Middle metatarsus distinctly curved, its inner surface beset with several 



stout spines 29. 



Middle metatarsus not so formed 30. 



29. Mesosternum marked with black; sternites 2-4 mostly black; genital stipes 



as in Figure 217 arcuata. 



Mesosternum yellow; sternites 2-4 almost wholly yellow; genital stipes 

 as in Figure 218 U-scripta. 



