M. C. VAN" DUZEE 85 



ronsi(l(M-ahIy infuscated above at t'.p. Fore and middle tibiae yellow; hind 

 tibiae wholly black, with thiee bristles above. Fore tarsi as long as their 

 tibiae, black from the tip of the first joint, which is slightly widened at ti]) 

 and as long as the remaining four joints taken together; middle tarsi as long 

 as their tibiae, yellow, darker at tip; hind tarsi wholly black, with the first 

 joint a httle shorter and thicker than the second. Calypters their cilia and 

 .the halteres, yellow. 



Wings dark grayish; third and fourth nearly parallel beyond the cross-vein, 

 then slightly convergent and again nearly parallel at their tip, last section of 

 fifth vein about two and one-half times as long as the cross-vein; wing nar- 

 rowed at its base. 



Described from one male, which I took at Rochester, New York, 

 AFay 2*), IUKj. Type in the author's collection. 



Xiphandrium femmeum variety dubium new variety (Text-figs. 7 



and 8.) 



This form is like femirjeum, except that the outer lamellae are longer (figure 7) 

 and appaiently with longer stem; it is possible, but not probable, that they 

 appear so on account of being more extended; the inner appendages (figure S) 

 are about the same in both forms. The first joint of the fore tarsus is a little 

 shoiter, being as long as the two following joints taken together, not as long 

 as the following three joints, as is the case in femineuni. The last section 

 of fourth vein is very nearly straight in this form, being only shghtly bent 

 near its middle, while m feviineum its bend is very distinct, although not 

 great. 



These are all structual characters and, although slight, would 

 if constant give specific rank to this form, but until more material 

 is secured I think it better to i)lace it as a variety oi fcinineiun. 



Described from one male, which I took at (iasport, N(!\v York, 

 August 28, 1021. Ti/pe in the author's collection. 

 Xiphandrium longicorne new species (Text-fig. 2.) 



a' : Length, 3 mm. Head rather small. Face very narrow, silver}- white, 

 in the ty|)e the eyes touch in the middle of the face, probably because the head 

 is shrunken. Palpi and proboscis black. Antennae l)lack, its white pubescence 

 consjjicuous; third joint very long, nearly as long as the abdomen; in the 

 t3-l)e it is wa\'y, like a ribbon, of nearly equal width for nearly its entire ieiigl h; 

 arista short and thick, but as long as the width of the front. Front gieenish, 

 very short, not much more than a line and without bristles. Orbital cilia 

 and beardwhite; I cannot see any black cilia above. 



Dorsum of thorax and the scutellum shining green; i)leura slightly dulled 

 with whitish j)ollen. Abdomen green with coppery reflections, the lower 

 portion of its sides with pale hairs. H}'poi)ygiuiu (fig. 2) black, without hair, 

 but with scales of jiollcn; its lamellae develojxd into long ribbon-like black 

 filaments, which are fringed with long bristly liaiis: tiie inner ai)pendages are 

 also long filaments with long bristles at tip, enlarged a little at base. 



TRANS. AM. ENT. SOC, XKVIH. 



