FLIES OF GENUS RIVELLIA — NAMBA 23 



of the Utah State Agricultural College, Dr. M. T. James of the State 

 College of Washmgton, Prof. E. L. Kessel of the California Academy 

 of Sciences, Dr. H. H. Ross of the State Natural History Survey 

 Division of the State of Illinois, Dr. P. W. Fattig of Emory University, 

 and Dr. R. H. Beamer of the University of Kansas. Thanks are 

 also due to Mr. C. W. Sabrosky and Mr. R. R. Dreisbach for loan 

 of material from their private collections, to Miss Mary Ellen Warters 

 and Mr. B. Ebel, graduate students at the University of Minnesota, 

 for aid in collecting RiDellia specimens, and to Air. G. Steyskal for 

 his valuable suggestions and loan of material from his collection. 



I express my sincere gratitude to the personnel of the U. S. National 

 Museum, Harvard Museum of Comparative Zoology, and the 

 Academy of Natural Sciences of Philadelphia for courtesies extended 

 when I visited these institutions to examine types, and to Mr. E. 

 Seguy of the Museum National d'Histoire Naturelle, Paris, for his 

 valuable information on the types of R. viridulans, R. boscii, Herina 

 guadrifasciata, and Urophora interrwpta. 



Thanks are also due to Dr. John W. Moore, Botany Department, 

 University of Minnesota, for his identification of plants. Lastly, to 

 my wife, "Winifred, I am grateful for her compilation of date and 

 locality data and typing of the manuscript. 



The following abbreviations are used in the distribution data: 

 Snow Entomological Collection, University of Kansas, SEC; Division 

 of Entomology, North Carolina Department of Agriculture, NC; 

 Iowa State College, ISC; Cornell University, CU; U. S. National 

 Museum, USNM; Illinois Natiu-al History Survey, INHS; California 

 Academy of Sciences, CAS; Emory University, EU; Academy of 

 Natural Sciences of Philadelphia, ANSP; Agricultural and Mechanical 

 College of Texas, TAM; Canadian National Collection, CAN; R. R. 

 Dreisbach Collection, RRD; C. W. Sabrosky Collection, CWS; G. 

 Steyskal Collection, GS; University of Minnesota, UM; American 

 Museum of Natural History, AMNH; State College of Washington, 

 sew ; GSMNP, Great Smoky Mountains National Park. 



Genus Rivellia Robiiieau Desvoidy 



Rivellia Robineau Desvoidy, 1830, p. 729.~Rondani, 1856, p. Ill; 1869, p. 28. — 

 Schiner, 1864, p. 80.— Loew, 1873, p. 87.— Van Der Wulp, 1896, p. 179.— 

 Williston, 1896, p. 116; 1908, p. 275.— Aldrich, 1905, p. 588.— Becker, 1905, 

 p. 104.— Wingate, 1906, p. 326.— Hendel, 1914a, p. 152; 1914b, p. 85.— 

 Curran, 1934, p. 281.— Hennig, 1945, p. G. 



Type species: Musca syngenesiae Fabricius {= Rivellia herharum 

 Robineau Desvoidy). Type designation by Rondani (1856). 



The characters possessed by all Rivellia species considered in this 

 paper are as follows: 



