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PROCEEDINGS OF THE NATIONAL MUSEUM VOL. lOi 



Figure 4. — a-d, Rivellia michiganensis, new species: a, wing; b, lateral aspect of ninth 

 tergite and proctiger of male; c, lateral aspect of aedeagus; d, dorsal aspect of aedeagus. 

 e-h, R. metallica Van Der Wulp: e, wing;/, lateral aspect of ninth tergite and proctiger of 

 male; g, lateral aspect of aedeagus; h, dorsal aspect of aedeagus. i, ;, R. flavimana Loew: 

 i, wing; ;, lateral aspect of ninth tergite and proctiger of male, k-n, R. steyskali, new 

 species: k, wing; /, lateral aspect of ninth tergite^and proctiger of male; in, lateral as- 

 pect of aedeagus; n, dorsal aspect of aedeagus. 



