FLIES OF GENUS RR^ELLIA — NAMBA 71 



Specimens examined: Alabama (21cf c^): Atmore, Decatur; July 

 6-11. Colorado (2cfcf): Wray; Aug. 23. Florida (64cfcf): 

 Bratt, Hibernia; July 10-Aug. 29. Georgia (7 cT cf ) : Atlanta, Billy's 

 Island (Okefenokee Swamp), Dewitt, EUaville, Griffin, Roberta, 

 Statham; May 19-Sept. 8. Illinois (2cfcf): Dubois, Meredosia; 

 May 24-29. Indiana (2cf d^): LaFayette, Logansport; June 21- 

 Aug. 10. Iowa (2 cf cf ) : Pleasant Valley, Sioux City; June 10-July 5. 

 Kansas (3cfcf): Douglas CouiitA^, Montgomery County, Wichita; 

 June 21-Aug. 26. Maryland {3d^ d^): Chesapeake Beach; May 24- 

 Aug. 19. Montana (Icf): No date. Nebraska (Icf): Valentine; 

 June 8. North Carolina (3cf cf): Beaufort, Lake Waccamaw, 

 Raleigh; April 14-June 7. North Dakota (2cf'cf): Bismarck; June 

 14. New Jersey (Scf cf): Atlantic City, Cape May, Clementon, 

 Lakehurst, Stone Harbor, Wildwood; July 5-Sept. 2. New York 

 (2cf cf): Mosholu, Peru; June 24. Oklahoma (Icf): Norman; May 

 4. Quebec (Icf) Abbotsford; April 14. South Carolina (12cf cf): 

 Clemson College, Fairfax, Manning; May 29-Aug. 23. South 

 Dakota (Icf): Elk Pomt; no date. Texas (Icf): Galveston; May. 

 Virginia (2cf cf): Smithfield; no date. 



Remarks: Mr. E. Seguy of the Museum National d'Histoire 

 Naturelle, Paris, has informed me (in litt.) that the types of Herina 

 quadrifasciata Macquart and another species "ont disparu et sont 

 tres certainement detruits." In view of this statement and the 

 inadequacy of the original description of Herina quadrifasciata, I have 

 no way to ascertain whether R. colei or the species now under con- 

 sideration is R. quadrifasciata (Macquart). However, since the species 

 here described is more common (especially in the eastern United 

 States) and more widespread than R. colei, I am regarding it as R. 

 quadrifasciata. 



Inasmuch as these two species cannot be separated, as far as I can 

 determine, without examination of the male genitalia and since there 

 is no indication of such examination, previous citations of R. quadri- 

 fasciata other than the original may be referable to either R. quadri- 

 fasciata or R. colei. 



Rivellia colei, new species 



Figure Q,d-f 



Not Rivellia viridulans Robineau Desvoidy. — Cole, 1927, p. 443, fig. 252. 



Holotype: Male. Body length about 4.7 mm. 



Head : Frons reddish brown ; upper fronto-orbital plates and ocellar 

 triangle blackened. Face with dorsal half pruinose, ventral half 

 shining, pale broAvnish yellow; parafacials and part of orbits ventral 

 to each eye brownish yellow. Antenna with first and second segments 



