42 PROCEEDINGS OF THE NATIONAL MUSEUM vol.66 



yellow. All femora "vvith a row of yellow hairs below which are a 

 little longer than those above; hind pair black at tip above and with 

 a few slender black bristles on apical third of outer surface, which 

 are about as long as width of the femora. Middle tibiae with rather 

 long bristles above. All tarsi almost wholly yellow ; fore and middle 

 tarsi longer than their tibiae; joints of the anterior tarsi as 

 '60-12-0-5-6. Hind tarsi (fig. 33) with their joints as 24-23-16-9-7, 

 their first joint with a thornlike projection at tip; fifth joint con- 

 tracted in the middle. Calypters yellow^ with a narrow black tip 

 and white cilia. Halteres yellow. 



Wings a little grayish ; last section of fourth vein a little bent just 

 before its middle, parallel with third beyond this bend, ending in 

 the apex of the Aving; all veins rather widely separated, as the wing 

 seems wide ; last section of fifth vein one and a half times as long as 

 the crossvein. 



Described from one male taken by Doctor Aldrich at Lafayette, 

 Indiana, July 25. 



Type.— Male, Cat. No. 27054, U.S.N.M. 



This is very much like the preceding species ; it differs in the pro- 

 portionate lengths of the first and second joints of hind tarsi: length 

 of the arista, length of the bristles on the middle tibiae, length of 

 the outer hypopygial lamellae and in other minor points. 



