208 DIPTERA OF NORTH AMERICA. [PART IV, 



pubescent ; wings immaculate ; stigma pale brownish ; a stump of a 

 vein near the origin of the praefurca. Long. corp. 0.35. 



Head reddisli-yellow, with a grayish bloom on the front ; palpi 

 brown ; antennae more than twice the length of the thorax, brown, 

 two basal joints yellowish, the second somewhat infuscated; joints 

 of the flagellum elongated, cylindrical, clothed with a dense, deli- 

 cate pubescence ; a few short verticils about the middle of the 

 joints. Thorax reddish-yellow, somew^hat shining above, some- 

 times with faintly-marked brownish stripes ; pleurte with an opaque 

 yellowish bloom ; halteres with a brownish knob. Feet tawny ; 

 tips of the femora and of the tibia3 brown. Abdomen yellow ; 

 last segment brown ; forceps yellow. Wings with a faint pale 

 brownish tinge ; stigma pale brown ; a faint, small pale brown 

 cloud at the origin of the proefurca (sometimes obsolete) ; mar- 

 ginal cross- vein at the tip of the first longitudinal vein ; petiole 

 of the first submarginal cell about the length of the great cross- 

 vein ; this cell is very narrow in its basal half, broader towards 

 the tip ; the inner end o^ the second submarginal cell very little 

 anterior to the inner ends of the first posterior and of the discal 

 cells ; the petiole of the second posterior cell is nearly of the same 

 length with the cell itself (sometimes longer) ; the great cross- 

 vein is a little anterior to the middle of the discal cell ; there is a 

 stump of a vein near the origin of the prtefurca. 



Hah. Milton, Mass., May 18th (Mr. Scudder) ; four male 

 specimens. 



5. L.. tenuicoriiis, n. sp. % and 9 • — Nigrescens, cinereo-pollinosa, 

 antenuis nigris, in mare thorace multo longioribus, articulis elongatis, 

 pubescentibus ; in femina lougitudine thoracis ; halteres capitulo infus- 

 cato, abdomen cum forcipe nigro-fusci ; alffi immaculatae, stigmate pallido. 



Elackish, with a grayish pollen, antennae black, those of the male much 

 longer than the thorax, joints elongated, pubescent ; those of the female 

 of the length of the thorax ; halteres with a brownish knob ; abdomen 

 and forceps blackish-brown ; wings immaculate, stigma pale. Long, 

 corp. 0.28—0.32. 



Head black, clothed with a gray bloom ; rostrum and palpi 

 brown ; antennae black ; those of the male, if bent backwards, 

 would reach the second abdominal segment ; joints of the flagel- 

 lum elongated, slightly attenuated at both ends, clothed with a 



