. Fig. 112. Wing of A. longicostalis (^. brown or brown, the front legs a little paler; hind femora darkened above and below, without long hairs below; bristles on hind tibiae small, numerous and hair-like. Wings brown, veins dark brown; the wings give the impression of being a little narrow; costa long, a little varying, but generally about 0,55 or more; costal divisions about as 8—7—3, thus 1 longer than 2, but shorter than 2+3; costal cilia very long; fork somewhat long, the angle rather large, varying, sometimes almost rectangular; fourth vein issuing behind the base of the fork, distinctl
. Fig. 112. Wing of A. longicostalis (^. brown or brown, the front legs a little paler; hind femora darkened above and below, without long hairs below; bristles on hind tibiae small, numerous and hair-like. Wings brown, veins dark brown; the wings give the impression of being a little narrow; costa long, a little varying, but generally about 0,55 or more; costal divisions about as 8—7—3, thus 1 longer than 2, but shorter than 2+3; costal cilia very long; fork somewhat long, the angle rather large, varying, sometimes almost rectangular; fourth vein issuing behind the base of the fork, distinctly, but not much curved in its first part, for the rest slightly and evenly curved. Halteres yellow. Female. Similar; the lower supraantennals generally relatively a little smaller; costa relatively longer, to 0,60 of the wing-length, but also here somewhat varying. Length. Fully 1 to 1,5 mm. I have determined this species as longicostalis Wood, and I think the determination correct; Wood has only one striking character, the long costa, which he gives to about ^U of the wing-length, but he knew only the female, which as seen above has the longest costa; for the rest my description will be seen to agree well with Wood. 25*
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Photo credit: © The Bookworm Collection / Alamy / Afripics
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
