310 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



PLATE IV. 



1. Catabomba I'YRAstri Liiine, Lead of uialo, from in front; la, head of female. 



2. Syrphus Lesueurii Matq., wiug. 



3. Syrphus gkxicui.atus Macq., head of male. 



4. DiDKA laxa O. S., wing; 4a, head of male. 



5. Mesograpta geminata Say, head of male; 5a, hind leg of male. 



6. Xanthoghamma .EQUALE Loew, head of femal<^ 



7. Baccha aurinota Walker, Wing. 



8. Baccha fuscipennis Say, head of male; 8a, tin' .same, front view. 



9. Baccha Babista Walk., head of female. 



10. Neoascia globosa Walk., wing; 10a, head of male. 



11. Sphegina Kkeniana Will., wing. 



12. Sphkgixa infuscata Loew, wing; 12o, head of male. 



13. Pelkcocera Pekgrandei Will., male. 



14. Chalcomyia mrka Loew, head of male; 14a, head of female. 



15. Myiolepta xigra Loew, head of female. 



16. Sph.,erophoria cylindrica Say, head of male; 16a, ahdomen of male. 



