FLIES OF GENUS RIVELLIA — NAMBA 65 



of fourth vein proximad of anterior crossvein with definite bend. 

 Halteres yellowish brown. 



Abdomen: Tergites shining, rugose, black. Disc of first tergite 

 with pale setae. Genitalia (fig. 4,m,n) with apical part of aedeagus 

 from dorsal view shaped like the sound box of a guitar; from lateral 

 view, base bulbous, apex flattened. 



Allotype: Female. Body length about 4.1 mm.; wing length 3.3 

 mm., width 1.4 mm. Middle and hind femora brownish toward base; 

 hmd tibiae dark brown. Ovipositor sheath black. Otherwise similar 

 to holotype. 



Paratypes: 31 males, 71 females. Body length of males 3.3-4.9 

 mm., of females 3.6-5.3 mm.; wing length of males 2.5-3.5 mm., of 

 females 2.8-3.7 mm. Both sexes with body color sometimes almost 

 wholly black or brown. I have seen two males with dark brown 

 thorax and yellowish brown abdominal tergites. Otherwise essentially 

 similar to holotype or allotype. 



Specimens: Holotype, cT, St. Joseph, Mich., July 2, 1942, C. W. 

 Sabrosky (USNM 61858). Allotype, 9 , same data as holotype 

 (USNM). Paratypes: Arkansas: Fa3^etteville (Icf, Aug. 15, 

 1907). Alabama: Garden City (19, IcT, July 7, 1939, R. H. 

 Beamer). Georgia: (Icf); Atlanta (1 9 , June 27, 1933; 1 9 , June 

 7, 1935; 1 9 , June 8, 1935; 1 9 , June 13, 1935; 1 9 , May 20, 1937; 

 1 9 , May 30, 1941; 1 9 , July 15, 1942; 2 9 9, July 21, 1942; 1 9 , 

 July 28, 1942; 19, June 14, 1935, all collected by P. W. Fattig); 

 Billy's Island, Okefenokee Swamp (Icf, June 1912; IcT, June 15, 

 1912); Calhoun (1 9 , Aug. 20, 1949); EUavUle (2 9 9 , Id", May 18, 

 1937, P. W. Fattig) ; Grifiin (3 9 9 , 1 cf , Aug. 12, 1939, R. H. Beamer; 

 Icf , Aug. 12, 1939, J. D. Beamer; 5 9 9, Aug. 12, 1939, A. T. Hardy; 

 19, Aug. 12, 1939, D. E. Hardy); Hiawassee (IcT, June 16, 1945, 

 P. W. Fattig). Iowa: 1 mile south of Amana (Icf, June 23, 1928, 

 G. Hendi'ickson) ; 10 miles southwest of Kelso (1 9 , July 30, 1928, 

 G. Hendrickson). Kansas: Douglas County (1 9 , June "900 ft.")- 

 Kentucky: Bardstown (1 9 , May 29, 1942, D. G. Denning) ; Cumber- 

 land Gap (19, G. Dimmock). Maryland: Cabin John Br. (19, 

 June 14, 1913, R. C. Shamion) ; Linnieville (1 9 , July 7, 1913, R. C. 

 Shannon); Plummers Island (1 9 , R. P. Currie; 19, Icf, June 29, 

 1913, R. C. Shannon). Michigan: East Lansing (599, 4(f'cf, 

 July 15, 1948, R. Namba); Midland County (2d'd', June 10, 1941, 

 R. R. Dreisbach); Nottawa (19, May 30, 1941, R. R. Dreisbach); 

 St. Joseph (1 9 , July 2, 1942, C. W. Sabrosky). Minnesota: (IcT, 

 Univ. of Minn., No. 13 sub 68); Carlos Avery Game Refuge, Anoka 

 County (IcT, June 24, 1951, R. Namba) ; Ramsey County (1 9 , June 

 29, 1951, R. Namba) ; University Farm, St. Paul, Minn. (3 9 9 , IcT, 



