LTMNOPIIILA. 211 



Rosti'.um ochraceous, palpi dark brown ; front brownish, with 

 a gray bloom ; antennas brown, paler at the basis ; those of the 

 male about once and a half the length of the thorax, filiform ; 

 joints subcylindrical, elongated, clothed with a dense pubescence; 

 a few verticillate hairs on each joint of the flagellum ; the antennfe 

 of the female are shorter than those of the male, but longer than 

 the thorax; joints elongated; no pubescence, but long, verticils. 

 Thorax brown above, this color occupying the space of the ordi- 

 nary stripes, which are not otherwise marked ; humeri and pleurte 

 ochraceous; scutellum and metathorax brown ; the knob of the 

 halteres is more or less infuscated ; feet long, slender, dark tawny, 

 pale at the basis, darker at the tips of the femora and of the tibijB ; 

 coxge ochraceous. Abdomen brown, venter paler. The tip of the 

 auxiliary vein is some distance anterior to the inner end of the 

 second submarginal and first posterior cell, which are in one line ; 

 the marginal cross-vein is some distance anterior to the tip of the 

 first longitudinal vein, close by the inner end of the first sub- 

 marginal cell ; the pr^furca is long, straight, in one line with the 

 petiole of the first submarginal cell, which is rather long, longer 

 than the great cross-vein ; the small cross-vein is arcuated ; the 

 great cross-vein is usually about the middle of the discal cell. 

 The wings are slightly tinged with brownish ; the stigma is more 

 or less brown ; sometimes quite pale. 



Bob. United States; not rare. Washington, D. C, Savannah, 

 Ga. ; Canada (Couper) ; Illinois (LeBaron). 



Say's descriptions of L. tenmpes and L. humeralis are so 

 much alike that the choice bej;ween them was somewhat difficult 

 in identifying the present species. Still, the words in the descrip- 

 tion of L. tenuipes, " antennae long" and " wings dusky," deter- 

 mined my choice. Wiedemann took both for synonyms ; but Say 

 denies this synonymy in a manuscript note, which I discovered 

 in a copy of Wiedemann's work, in the library of the Academy 

 of Natural Sciences in Philadelphia. That Wiedemann's L. 

 humeralis is the present species, results from his comparing it to 

 L. discicoUis Meig. And, indeed, these species are most closely 

 allied, with the only exceptions that the European species is 

 slightly larger, and that the antennae of the male are like those 

 of the female, and not at all elongated and pubescent as those 

 of L. tenuipes. The coloring and the venation of both species 

 are precisely the same. 



