72 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loa 



yellow; third segment blackened at tip and on outside, remainder 

 yellow, the tip pointed anteriorly. Anteclypeus pale brownish yellow. 

 Palpi yellow. Postcranium black, pruinose. 



Thorax: Mesonotum black; strong humeral setae absent, posterior 

 dorsocentral setae present. Scutellum and postscutellum concolorous 

 with mesonotum. Pleura black, mostly shmmg. Mesopleuron with 

 scattered pale setae on posterior half; pruinose area at dorsal posterior 

 corner in form of right triangle, one side reachmg ventral posterior 

 corner, the other, the anterior spiracle. Sternopleuron with ventral 

 margin broadly pruinose and with irregular band which extends from 

 ventral corner to dorsal margui of sternopleuron ; disc with scattered 

 pale setae. Disc of pteropleuron with scattered pale setae, no black 

 setae evident ventral to subalar. Hypopleuron with shining central 

 spot, remainder pruinose. Laterotergite densely pruinose. Pro- 

 sternimi brown medially, with yellow borders. 



Thoracic appendages : All legs with coxae and femora wholly yellow. 

 Front and middle tibiae yellow, hind tibiae black. Front and hind 

 tarsi shghtly blackened from second segment, fii'st segment yellow. 

 Middle tarsi wholly yellow. 



Wmg (fig. Q,d) length 3.5 mm., width 1.5 mm. Bands black. 

 First and second bands joined at costal margin; third and fourth 

 bands joined at costal margin. The part of first basal cell contiguous 

 to second basal cell banded on about basal two-thirds; apical one- 

 third hyaline, this hyaline area wedgelike basally. Section of fourth 

 vein proximad of anterior crossvein with definite bend. Halteres 

 yellow. 



Abdomen: Tergites shining, rugose, broAvnish yellow. Disc of 

 first tergite with pale setae. Genitalia (fig. 6,/) with apical part of 

 aedeagus consisting of a long cylindrical neck, a small spherical head, 

 and two long termmal tubes which are about twice as long as the neck. 



Allotype: Female (collected with^holotype). Body length about 

 4.4 mm., wing length 3.3 mm., width 1.4 mm. Middle tarsi blackened 

 from third segment. Ovipositor sheath black. Otherwise similar to 

 holotype. 



Paratypes: 34 males. Body length 4.0-4.9 mm.; wmg length 

 3.1-3.5 mm. Frons sometimes 3-ellowish brown; postcranium some- 

 times blackish green. Thorax sometimes dark brown or blackish 

 green; medial pruinose band on sternopleuron frequently absent. 

 Hmd tibiae brownish yellow to dark brown. Prosternum sometimes 

 wholly yellow. One male with abdominal tergites almost wholly 

 dark brown; this may be owing to contents of abdomen. Otherwise 

 similar to holotype. 



Specimens: Holotype, cf , Mississippi Bluff, one-half mile north of 

 state Ime, Houston County, Minn., June 1, 1951, R. Namba (UM). 



