. Insect transformations . Biioy-like itructure In rlic Uiil of a water-grub cir» two-viinjed flyStrittiomy-i Chianaleon.) part 1 I 158 INSECT TRANSFORMATIONS, The preceding grub may occasionally be found inshallow ditches, and about the edges of ponds, insummer; but a remarkable larva, with a very dif-ferent apparatus for breathing, is much more commonin similar situations, and also in the open drains fromdunghills, &c. The latter is the maggot of a two-winged, bee-like fly [Helophihis pcndulus, Meigen),and trom its shape is appropriately termed rat-tailedby Reaumur. The tail is the part of t
. Insect transformations . Biioy-like itructure In rlic Uiil of a water-grub cir» two-viinjed flyStrittiomy-i Chianaleon.) part 1 I 158 INSECT TRANSFORMATIONS, The preceding grub may occasionally be found inshallow ditches, and about the edges of ponds, insummer; but a remarkable larva, with a very dif-ferent apparatus for breathing, is much more commonin similar situations, and also in the open drains fromdunghills, &c. The latter is the maggot of a two-winged, bee-like fly [Helophihis pcndulus, Meigen),and trom its shape is appropriately termed rat-tailedby Reaumur. The tail is the part of the grub whichmost merits attention, being formed somewhat after thetelescopic model of the ovipositor of the breeze flies,*. Telescopic-tailed water larvse. «, a glass vessel of water containingtlie larva!, natural size, b, niagnifieil view of tlie tail, witli the breatli-ing tube partially contracted, c, a still more enlarged view of the tail. * iiee Insect Architecture, p. 403. ORGANS FOR BREATHING IN WATER-GRUBS. 159 but consisting only of two tul)cs, tlie outer one serv-ing as a slioatli, within wliicli the inner one can beretracted at pleasure. Jioth of these are composed offibrous rings; and are so very extensile, that R aumurhas seen them pushed out to twelve times the lengthof the body of the maggot. The contrivance by whichthe inner tuhe is pushed out is no less simple thaningenious. It is lurnishcd at the hase with twoflexihic pipes, coiled up, when it is sheathed, intoseveral lolds and communicating with the douhlcwind-pipe ( Travlua) in the hody. When it wishesto extend this breathing-tube, therefore, it inflates, bymeans of air from the wind-pipe, the tlexihle pipes,and in this way pushes them
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