308 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



PLATE III. 



1. Chilosia occidkntalis Will., wing; la, head of male, 



2. Chilosia lasiophthalma Will., head of male. 



3. Chilosia cyanescens Loew, wing. 



4. Chilosia plumata (cyanescens) Loew, head of female. 



5. Chilosia tristis Loew, head of male (Washington specimen). 



6. Leucozona lvcokum Linn^, wing; (i«, head of male. 



7. Melanostoma angustatum Will., head of male. 



8. Melanostoma tigrinum O. 8., head of male. 



9. Melanostoma mkli.inum Linne, head of male. 



10. Platychiki'S (H adkatus Say, head of male ; 10a. right front tibia and tarsns of 



male. 



11. PLATYCHiurs PKLTATUS Melg., head of male; llrt, left front tibia and taiisiis of 



male. 



12. Platychirus HYPEIU50KEUS Staeger, right front tibia and tarsus of male. 



13. PYROPH.ENA OCYMI Fabr., abdomen of female; 13a, right front tibia and taimit. 



of male; 13&, left middle tibia and tarsus of male ; 13c, wing. 



14. EuPEODES voLUCRis O. S., abdomen of male; 14«, hypopygium. 



