258 DIPTERA OF NORTH AMERICA. [PAET IV, 



Brownish; head above with a thick bluish bloom ; tarsi whit<3 ; antennae 

 of the male as long as the body ; those of the female much shorter ; 

 five posterior cells. Long. corp. 0.25 — 0.3. 



Head brownish above, with a bluish bloom, which sometimes 

 entirely conceals the brown ; yellowish-tawny below ; palpi 

 brownish, except the basis, which is yellowish : antennoe brown, 

 two basal joints yellowish-tawniy ; those of the male nearly as 

 long as the body, clothed with a dense, delicate pubescence; 

 those of the female, if bent backwards, would hardly reach beyond 

 the root of the wings. Thorax yellowish-tawny, brownish above, 

 shining, and with a slight gray or bluish bloom upon the brown ; 

 four darker stripes are sometimes indistinctly marked ; halteres 

 brownish ; abdomen brown, venter yellowish, the male forceps 

 and the basis of the ovipositor are likewise yellowish ; coxa3 

 yellowish, feet brown, tarsi white ; last joint somewhat brownish. 

 Wings slightly tinged with brownish ; stigma almost imper- 

 ceptible ; first submarginal cell but little shorter than the first 

 posterior ; marginal cross-vein at a considerable distance boyond 

 the inner end of the first ubmarginal cell ; five posterior cells ; 

 the petiole of the second is rather long. 



Hab. New London, Conn., on the sea-beach, a female ; Penn- 

 sylvania (Cresson), a male. I have only these two specimens 

 before me ; the male is considerably smaller than the female, the 

 petiole of the second posterior cell is comparatively much longer, 

 the wings are more brown ; but the agreement of the two speci- 

 mens in other respects is perfect. Both specimens had only the 

 hind tarsi left. 



