FLIES OF GENUS RI^ELLIA — NAMBA 73 



Allot3T)e, 9, same data as holotype. Paratypes: Connecticut: 

 Avon Old Farms, Avon (1 cf , June 20, 1929, C. H. Cmran). Illinois: 

 Champaign (Icf, May 15, 1889, "481"); Meredosia (Ic^, May 29, 

 1917; IcT, Aug. 20, 1917, "sand pit"); Normal (IcT, July 1-10, 1883, 

 "3478"; Icf, August 1883, "3531"); Savanna (Id^, July 26, 1892, 

 McElfresh, "18530"); Urbana (Icf, Sept. 1, 1889, "580"). Iowa: 

 10 miles southwest of Kelso (2 d^ d", July 30, 1928, G. O. Hendrickson) ; 

 Sioux City (1 cf , June 3, 1931, C. N. ^iinslie). Louisiana: Opelousas 

 (Id", April 1897). Missouri: Shrewsbiu-ry (?) (Id', July 10, 1949, 

 and od^d^, Aug. 6, 1949, TV. Downes). Nebraska: Fullerton (Id^, 

 Aug. 19, 1949, R. K. Schwab-R. R. Dreisbach). New Jersey: Cape 

 May (Id', June 24, 1933, Witmer Stone); Stone Harbor (Id", Aug. 6, 

 1935, E. T. Cresson Jr.); Van Cortland (Id', July 11, 1895, J. L. 

 Zabriskie) ; Whitehorse (2d' d', June 20, 1933, F. S. Blanton). New 

 York: N. Tarrytown (4d'd', Aug. 10, 1935, Blanton and Borders); 

 Yonkers (Id"). North Carolina : Hendersonville (2d'd', June, 

 1907, F. Sherman). Pennsylvania: Glenside (Id", July 5, 

 1909, G. M. Greene). Tennessee: Knoxville (Id", July 2, 1891, 

 H. E. Summers). Virginia: Boykins (Id", June 10, 1895). (In 

 INHS, NC, CU, CAS, SEC, and USNM.) 



Remarks: This species is veij" closely related to R. quadri^fasciata. 

 The males of these species can be easily differentiated by the genitalia. 

 However, no diagnostic character could be found to separate the 

 females. From other Rivellia, B. colei can be distinguished by the 

 male genitalia, blackish thorax and yellowish abdominal tergites, and 

 the wing banding. 



Literature cited 



Aldrich, J. M. 



1905. A catalogue of North American Diptera (or two- winged flies). 

 Smithsonian Misc. Coll. vol. 46, No. 1444, 680 pp. 

 Becker, T. 



190.5. Katalog der palaarktischen Dipteren, vol. 4, 328 pp. 

 Blaxtox, F. S. 



1937. A new North American Qy belonging to the genus Rivellia (Otitidae). 

 Can. Ent., vol. 69, pp. 139-141, 1 fig. 

 Cole, F. R. 



1927. A study of the terminal abdominal structures of male Diptera (two- 

 winged flies). Proc. California Acad. Sci., ser. 4, vol. 16, No. 14, 

 pp. 397-499, figs. 1-287. 



COQUILLETT, D. W. 



1900. Notes and descriptions of Ortalidae. Journ. Nevr York Ent. Soc, 

 vol. 8, pp. 21-25. 

 Cressox, E. T., Jr. 



1919. Dipterological notes and descriptions. Proc. Acad. Nat. Sci. Phila- 

 delphia, vol. 71, pp. 171-194. 



1924. Studies in the dipterous family Ortalidae, with descriptions of new 

 species, mostly from North America. Trans. Amer. Ent. Soc, 

 vol. 50, pp. 225-241. 



