62 DIPTERA OF NORTH AMERICA. [PART IV. 



hardly projecting ; stignia elongated, pale ; costa and first longi- 

 tudinal veins pale yellow, the other veins brown ; tip of tbe 

 auxiliary vein very little beyond the origin of the prsefurca ; sub- 

 costal cross-vein immediately opposite this origin ; tip of the first 

 longitudinal vein a little anterior to the middle of the sub- 

 marginal cell ; the latter rather long, longer than the first pos- 

 terior cell j the discal cell being open, the first and second 

 posterior cells are of equal length ; the third is one-half the 

 length of the second ; seventh longitudinal vein somewhat 

 bisinuated. 



Hab. Trenton Falls, N". Y., where I caught numerous speci- 

 mens on a meadow. 



In general habitus this species is different from the other 

 Dicranomyiee ; its very narrow wings with their yellow costal 

 and first longitudinal veins, forming a contrast with the brown 

 color of the other veins, make it easily recognizable. The struc- 

 ture of its male forceps belongs to the same type with those of 

 the other species of the group. I had at first described D. longi- 

 pennis under the name of D. immemor, but recognized afterwards 

 its identity with a species belonging to eastern Europe. 



2. D. iminodesta 0. S. % and £ .— Ochracea, thoracis vitta fusca ; 

 antennis fuscis, basi pallidis ; alis hyalinis, stigmate pallido, areola 

 discoidali aperta ; venae anxiliaris apex initio praefurcse plus minusve 

 oppositns ; venula subcostalis transversa ab auxiliaris apice stigmatis 

 longitudine remota. 



Ocbraceous, thorax with a brown stripe ; antennae brown, pale at tbe base ; 

 wings byaline, stigma pale ; discal cell open ; the tip of tbe auxiliary 

 vein is nearly opposite the origin of tbe praefurca ; tbe subcostal cross- 

 vein is at a distance from tbe tip of tbe auxiliary vein, wbicb is about 

 equal to tbe length of the stigma. Long. corp. 0.25 — 0.3. 



Syn. Dicranomyia immodesta 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 211. 



Rostrum pale, palpi infuscated ; antennae fuscous, pale at base ; 

 verticils rather long ; front and vertex infuscated. Thorax 

 ochraceous, paler on the pleura? ; a dark brown stripe, extending 

 over the collare, in the middle ; this stripe is abbreviated behind 

 and does not reach the transverse suture ; the lateral stripes are 

 not perceptible ; both ends of the scutellum and a stripe in the 

 middle of the metathorax usually infuscated. Knob of the 

 halteres dusky ; feet pale tawny, coxa? and basis of the femora 



