. Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken. Diptera; Insects; Diptères; Insectes. ]: M flU K . 11 l\l-'\ ' » m 0->.> DIPTERA OF NORTH AMERICA. [part IV. liiisis of tlic fliifift'llurn not longer than broad, somewhat more eloiigalcd and slender towards the tip; verticils comparatively short. Tiiornx grayish-brown; an obsolete pale brown douhle stripe above ; Iialteres i)ale at the basis ; knob slightly infuscated; feet dark tawny, slightly infuscated at the tips of the femora and of the tarsi; coxa) and basis of t
. Monographs of the Diptera of North America [microform] / prepared for the Smithsonian Institution by R. Osten Sacken. Diptera; Insects; Diptères; Insectes. ]: M flU K . 11 l\l-'\ ' » m 0->.> DIPTERA OF NORTH AMERICA. [part IV. liiisis of tlic fliifift'llurn not longer than broad, somewhat more eloiigalcd and slender towards the tip; verticils comparatively short. Tiiornx grayish-brown; an obsolete pale brown douhle stripe above ; Iialteres i)ale at the basis ; knob slightly infuscated; feet dark tawny, slightly infuscated at the tips of the femora and of the tarsi; coxa) and basis of the femora pale. Abduinon brownish; forceps paler. Wings faintly tinged with brownish; stigma very slightly darker ; the second submarginal cell only a trifle longer than the first posterior; the second posterior is live or six times shorter than its petiole; the petiole of the first siil)- niarginal cell is distinctly shorter than the great cross-vein; marginal cross-vein very faint, about the middle of the distance between the tip of the first longitudinal vein and the inner end of the first submarginal cell; great cross-vein about the middle of the discal cell; seventh longitudinal vein straight, except the extreme tip, which is a little curved. llah. Washington, D. C, in April. I Imd eight male siieci- raens when I first described this species. A number of them were swarming round a spring, in the woods. One of the speei- mens has a faint indication of an adventitious cross-vein in the middle of the first basal cell. The black pits on the humeri are well marked, but the double dot in the front of the mesonotum is obsolete. ISt L. ultima 0. S. % and J.—Gri&ea, thorace vittisquatuorfu-'cis; alls hyalinis, iinmaculatis; antennis fusois, articulis flagelli basalilms quatuor coalescentibus, incrassatis; cellula subuiarginalis secuiula priin^ posteriori parum loiigior ; vena longitudinalis septima recta. Gray, thorax with four brown stripes; wings hyaline, immaculate; an-
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectd, booksubjectinsects
