. Monographs of the Diptera of North America [microform]. Diptera; Insects; Diptères; Insectes. HYDllOl'HOULS. i>15 tlio fore femora as usual, tliickc'iuMl towards the Itasis, on thoir umk-r sido with two rows of tliorn-likc hristlos, the inner row of which I'eaclies as far as their tip, while the exterior one stops already on the nii(Mle of the femora. Til)ia' dark-green, tlie fore- most uniformly fringed, upcjn their U'lder side, with very short thorn-like l)ristles. Tarsi black. Oilia of the teguhe fallowish- yellow. JIalteres with a dusky-yellowish ])eduncle, and witii blackened knob.
. Monographs of the Diptera of North America [microform]. Diptera; Insects; Diptères; Insectes. HYDllOl'HOULS. i>15 tlio fore femora as usual, tliickc'iuMl towards the Itasis, on thoir umk-r sido with two rows of tliorn-likc hristlos, the inner row of which I'eaclies as far as their tip, while the exterior one stops already on the nii(Mle of the femora. Til)ia' dark-green, tlie fore- most uniformly fringed, upcjn their U'lder side, with very short thorn-like l)ristles. Tarsi black. Oilia of the teguhe fallowish- yellow. JIalteres with a dusky-yellowish ])eduncle, and witii blackened knob. Wings very Ictng, tinged with gray, not darker towards the anterior margin, with black veins up to the extreme root ; the end of the third longitudinal vein somewhat approaches tin; fourth, so that these veins converge distinctly towards their ends ; upon the posterior transverse vein and upon the convexity, which the last segment of the fourth longitudinal veins crosses, there is a somewhat more gray sp(jl, which in almost invisible to the naked eye. Ildb. Pennsylvania, District of Columbia. (Osten-Sacken.) Ohscradioii.âIt is dilliciilt to d(;termine, whether 7/. jufn/a is not one of those four species of JJi/drop/iondi which Mr. Walker has described as si)ecies of Mi'dcleriiH. They agree in a good numy resi)ects not only anH)ng themselves, but also with 11. ])iral(i, while each of them exhil)its also some distinguishing feature. //. viridijla.'i must be much more green, according to Mr. Walker's statements, than //. pirala; besides, the cilia of the inferior ori)it of the former one are white, while those of the latter are yellow; moreover, its abdomen is conical and longer than the thorax, an entirely uncommon character for a female of JJiftlrop/ionis, anil making it ahnost doul)tful whether it really behjngs to this genus; finally the veins of the wings are said to be brownish-yellow near the root of the wing; these discrej)ancies are altogether too great to justify the
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectinsects, bookyear1864
