210 DIPTERA OP NORTH AMERICA. [PART IV. 



Head black ; front broad, with a gray, almost silvery reflection ; 

 antennoe of the male more than double the length of head and 

 thorax taken together ; first joint very short ; joints of the flagel- 

 lum long, cylindrical, clothed with a dense, delicate pubescence ; 

 the verticils are hardly perceptible ; the anteunce of the female, 

 when bent backwards, would hardly reach the root of the wings ; 

 joints short, oval, the basal ones of the flagellum truncate at the 

 end ; with scattered hairs and inconspicuous verticils among 

 them. Ground color of the thorax black, clothed above with a 

 yellowish-gray pollen, antl therefore but faintly shining ; stripes 

 hardly marked ; pleurae somewhat hoary ; halteres yellowish. 

 Coxae yellow ; feet brownish-tawny, pubescent; femora and tibiae, 

 towards the tip, brownish ; hind tarsi, except the tip, white. 

 Abdomen brown (in some specimens mixed with yellowish) ; 

 male forceps yellow. Wings with a faint brownish tinge ; stigma 

 pale brownish ; tip of the auxiliary vein nearly opposite the inner 

 end of the second submarginal cell ; petiole of the first sub- 

 marginal cell about equal in length to the great cross-vein ; 

 marginal cross-vein faintly marked, close by the tip of the first 

 longitudinal vein ; inner end of the second submarginal cell some- 

 what anterior to the inner end of the first posterior cell ; in some 

 specimens the inner end of the third posterior cell is almost 

 pointed, the cross-vein separating it from the discal cell being 

 very short ; in other specimens, however, this is not the case ; 

 great cross-vein nearly opposite the middle of the discal cell, 

 somewhat variable in its position. 



Hab. Delaware (Dr. Wilson) ; Maryland (Cresson). Three 

 male and one female. The tip of the abdomen of the female is 

 broken ofi*. 



T. L.. teiiuipes Say. % and 9- — Brunnea, humeris pleurisqne 

 ochraceis ; anteniiis maris thorace multo lougioribus, articulis elongatis, 

 piibesceutibus ; alse immaculatse, pallide infuscatse. 



Brown, humeri and pleurse ocliraceous ; antenna of the male mnch longer 

 than the thorax ; joints elongated, pubescent ; wings immaculate, with 

 a pale brownish tinge. Long, corp. 0.3 — 0.4. 



Syn. Limnohia temnpes Say, Journ. Acad. Nat. So. Phih III, p 21, 3. 

 Limnobia humeralis Wied. (non Say), Auss. Zw. I, p. 34. 

 LhnnophUa temdpes 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1859, p. 235. 



