10 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



arista black, of moderate length, a little thickened to or slightly 

 beyond middle, length of penultimate joint about twice its width; 

 proboscis hardly equaling the height of head, distal joint moderately 

 stout; labella somewhat fleshy but not very large; palpi yellow, 

 thickened and strongly bowed upward on apical half, bearing long 

 black hairs on the lower edge: cheeks gray pollinose, clothed with 

 short fine hairs, about one-fifth the eye height; beard dense, whitish; 

 eyes bare. 



Thorax black with gray pollen; when viewed from beliind five 

 doi-sal black stripes apparent, the median one becoming indistinct 

 anteriorly, the outer pair broadest, interrupted at suture, and the 

 intermediate ones obsolete shortly behind suture; scutellum wholly 

 reddish, covered with changeable grayish-white pollen appearing 

 denser and almost silvery in a very flat rear view. Chaetotaxy: 

 Acrostichal, 3, 3; dorsocentral, 3, 4; humeral, 4; posthumeral, 3 

 (anterior one small); presutural, 2; notopleural, 2; intraalar, 3 

 (none near suture); supraalar, 3; postalar, 2; pteropleural, 1; 

 sternopleural, 2, 2 ; scutellum with one discal, three marginal, and a 

 rather long decussate apical pair, disk covered with erect short 

 bristly hairs becoming spiny toward apex; postscutellum normal, 

 gray pollinose ; sides of postnotum below calypters bare ; calypters 

 opaque, white with yellow rims. 



Abdomen black in ground color, the sides of first three segments 

 reddish, fourth entirely black, conical, pointed, and noticeably de- 

 flexed ; with gray pollen on bases of last three segments extending on 

 the venter, the posterior third of intermediate segments and apical 

 half of fourth shining black; first segment with a pair of smallish 

 median marginals, second with a larger pair, third with a marginal 

 row of about 12 bristles, fourth with numerous erect spiny bristles 

 over most of its surface, the basal ones longest, becoming shorter and 

 weaker toward apex; genitalia retracted but evidently without a 

 piercing organ. 



Legs stout, black; middle tibia with three or four large bristles 

 on outer front side ; hind tibia ciliated on outer posterior edge with 

 one long bristle beyond middle ; claws and pulvilli not elongate. 



Wings subhyahne: costal spine inconspicuous; veins bare except 

 third, which has two to four setules near base; fourth vein with a 

 right-angular bend curving outward shortly beyond and continuing 

 almost straight to costa, leaving the first posterior cell rather broadly 

 open far before the wing tip; hind crossvein joining fourth much 

 nearer to bend than small crossvein. 



Length, 10 mm. 



Described from two females collected at College Station Tex 

 October 9 and 20, 1919 (H. J. Reinhard). ' 



T 2/ pe.— Female, U.S.N.M. No. 43271. 



