352 SUPPLEMENT. 



12. Middle and hind tibiae entirely black 13. 



At least the middle tibiae largely yellow 14. 



13. Middle metatarsi ciliated above (Cuba) . [pilosus, Loew.] 



Middle metatarsi not ciliated above (Mex.) inornatus, sp. n. 



14. Middle metatarsi ciliated (Mex., Brazil) triseriatus, sp. n. 



Middle metatarsi not ciliated 15. 



15. 3rd and 4th joints of hind tarsi subequal, a little swollen (Mex.) . . atricauda, sp. n. 

 These joints of normal structure (Cuba, Jamaica, Brazil) [jucundus, Loew.] 



16. Apical third of fore coxa, with trochanter and base of femur, yellow 



(Mex.) , coxalis, sp. n. 



Not more than the extreme apex of the fore coxa yellow 17. 



17. Middle tibia with a row of small bristles on the front of the inner side, 



extending the whole length (Mex.) ffenualis, sp. n. 



Middle tibia with a row of stout bristles on the outer side, middle 



metatarsus ciliated (Mex., Brazil) triseriatus, sp. n. 



Middle tibia with the usual bristles only 18. 



18. Last two joints of hind tarsus flattened 19. 



Last two joints of hind tarsus not flattened 20. 



19. Cross-bands broad, including half the wing (Brazil) [gracilis, Aldr.] 



Cross-bands narrow, scarcely a fourth of the wing darkened (Mex.) . depressus, sp. n. 



20. Middle tarsi entirely infuscated (Mex.) purpuratus, sp. n. 



Middle tarsi broadly yellow at the base 21. 



21. Hypopygium minute, appendages inconspicuous (Mex., Brazil) . . . similis, sp. n. 

 Hypopygium large, the appendages large, flattened, black (Mex.) . . atrolamellatus, sp. n. 



22. Face with abundant slender hairs 23. 



Face bare 27. 



23. Face with dark hairs (Mex., Brazil) harbatus, sp. n. 



Face with pale hairs 24. 



24. First joint of the middle tarsi beset with crooked bristles 25. 



First joint of the middle tarsi without bristles 26. 



25. Tip of the abdomen with a tuft of strikingly long hairs (U.S., Antilles, 



Mex., S. Am.) caudaius, Wiedem. 



Tip of the abdomen with only moderate hairs (U.S.) [scobinator, Loevr.] 



26. Middle tibia with a strikingly long apical spur (U.S.) [calcaratus, Loew.] 



Middle tibia without such spur (U.S.) [inermis, Loew.] 



27. Arista at least two-thirds the length of the entire body 28. 



Arista much shorter 30. 



28. Arista ending in a small disc, fore metatarsus without long cilia above 



(Mex.) nobilissimus, sp. n. 



Arista plain, fore metatarsus with a long cilia above 29. 



29. Appendages of hypopygium pale, middle metatarsus also ciliated (U.S., 



Mex.) comatus, Loew. 



Appendages of hypopygium blackish, middle metatarsus plain (U.S.) . [crinitus, Aldr.] 



