FLIES OF GENUS RIVELLIA — NAMBA 59 



part of aedeagus. The apical part not appressed to basal part of 

 aedeagiis. 



Paratype: Male. Body length about 3.5 mm.; wing length 2.5 

 mm. This specimen is covered with glue, but enough can be seen (in- 

 cluding aedeagus) to show that it is conspecific with the holotype. 



Specimens: Holotype, cf , Midland County, Mich., June 23, 1950, 

 R. R. Dreisbach (USNM 61918). Paratype: Michigan: Midland 

 County (Icf , June 25, 1950, R. R. Dreisbach, RRD). 



Remarks: This species appears to be related to R. jlavimana, from 

 which the males can be distinguished by the elongated and round- 

 tipped third segment of the antenna, broad fourth band of the wings, 

 and the male genitalia. 



Rivellia melliginis (Fitch) 



Figure o,a-c 

 Tephritis melliginis Fitch, 1855, p. 65. 



Type locality: New York (USNM). 



Males: Body length 4.0-6.0 mm. 



Head: Frons brown to reddish brown; upper fronto-orbital plates 

 and ocellar triangle blackened. Face with dorsal half pruinose, 

 ventral half shining, smooth, dark brown or black medio ventrally, 

 with brownish yellow lateral strip on each side which terminates 

 just before oral margin; parafacials and part of orbits ventral to 

 each eye brownish yellow. Antenna with first and second seg- 

 ments 3^ellow or brownish yellow; thu'd segment with tip and outside 

 blackened, remainder yellow, the tip pointed anteriorly. Anteclypeus 

 concolorous with medioventral portion of face. Palpi brown or black, 

 sometimes yellowish at base. Postcranium blackish blue, pruinose. 



Thorax: Mesonotum blackish blue; strong humeral and posterior 

 dorsocentral setae present. Scutellum and postscutellum concolorous 

 with mesonotiun. Pleura blackish blue, mostly shining. Meso- 

 pleuron with scattered pale setae on posterior half; pruinose area at 

 dorsal posterior corner in form of right triangle, one side reaching 

 half way to ventral posterior corner and the other side reaching half 

 way to anterior spiracle. Sternopleuron with narrow pruinose strip 

 on ventral margin and a much narrower strip on posterior margin; 

 disc vrith few scattered pale setae. Disc of pteropleuron with scat- 

 tered pale setae, one or two black setae present ventral to subalar. 

 Hypopleuron with shining central spot, remainder pruinose. Latero- 

 tergite complete!}^ and densely pruinose. Prosternum black. 



Thoracic appendages: Front legs: Coxae dark brown or black, 

 sometimes yellowish toward tip; femora black with extreme tip yel- 



