. Monographs of the Diptera of North America [microform]. Diptera; Insects; Diptères; Insectes. V. rsiLons. 259 lilack. wliitish only on tlic anterior juirt of lln' lateral niar<riii and of tilt' vontcr. 'I'lio l)la('k 's bctori' tlic iiind maruiii of tin' siiifrk' scjrinciits of" a very moderate length. Tlie very small liypn- pytrinni Idackisli ; the lilaekish-brown lanielhe very narrow, nearly lilit'orni. Coxa; l)laek or Itro\vnish-l)laek, somewhat dusted with white, the foremost with a rather distinet white juilx'seenee and with a few black l)ristles. Femora black, with a g
. Monographs of the Diptera of North America [microform]. Diptera; Insects; Diptères; Insectes. V. rsiLons. 259 lilack. wliitish only on tlic anterior juirt of lln' lateral niar<riii and of tilt' vontcr. 'I'lio l)la('k 's bctori' tlic iiind maruiii of tin' siiifrk' scjrinciits of" a very moderate length. Tlie very small liypn- pytrinni Idackisli ; the lilaekish-brown lanielhe very narrow, nearly lilit'orni. Coxa; l)laek or Itro\vnish-l)laek, somewhat dusted with white, the foremost with a rather distinet white juilx'seenee and with a few black l)ristles. Femora black, with a green reflection, the extreme tip of the foremost ones yellowish, that of the hind ones brown ; their lower si; their first joint is yellowish-brown, darker at the tip and not tpiite as long as the tibite, also hardly longer than th(! four following joints taken together; it has upon its hind side three' rather considerable bristles of increasing length; the four follow- ing joints of the fore tarsi are l)lackisli-l)rowu, more yellowish-brown at the basis, at least once and a half the length of the tibia'; their first joint nearly as long as the tibiie and once and a third the h ngth of the following joints taken together, which are of a decreasing length ; no unusual pubescence or l)ristles on the the middle tarsi. Hind tarsi brownish-ldack, distinctly shorter than the tibia"; first joint hardly longer than the four following joints taken together; the length of the l-atter is rapidly decreasing Ilidteres dingy- brown. Tegnhi' with a narrow black margin and l)Iack cilia. Wings hyaline with the usual sii)hon-like blackish ])icture; the two bands are peritendie'ida**, of medium breadth, still rather dis- tant from each other, connected only on the anterior margin ; tin' anterior lirancli of the fourth longitudinal vein diverges from it at an angle of about 1^)° and turns afterwards towards the nmrgin of the wing at a b>it little rounded angle ; it reaches it liefore the
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectinsects, bookyear1864
