. Bulletin - United States National Museum. Science. Fig. 23.—A Mosquito (Culex pipiens). a, adult; b, head of same enlarged; «, portion of antenna of same; /, larva; g, pupa. (After Westwood.) of small, slender filaments clubbed at tip, and called halteres, poisers, or bal- ancers. "IS'o order surpasses this in the number of species or in the immense swarms of individuals belonging to the same species which are frequently met with. The wings, which are vari- ously veined, though appearing naked to the Linaided eye, are often thickly covered with very minute hairs or hooks. As an order th
. Bulletin - United States National Museum. Science. Fig. 23.—A Mosquito (Culex pipiens). a, adult; b, head of same enlarged; «, portion of antenna of same; /, larva; g, pupa. (After Westwood.) of small, slender filaments clubbed at tip, and called halteres, poisers, or bal- ancers. "IS'o order surpasses this in the number of species or in the immense swarms of individuals belonging to the same species which are frequently met with. The wings, which are vari- ously veined, though appearing naked to the Linaided eye, are often thickly covered with very minute hairs or hooks. As an order the Diptera are decidedly injurious to man, whether we consider the annoyances to our- selves or our animals of the Mosquito, Buffalo-gnat, Gad-fly, Breeze-fly, Zimb or Stomoxys, or the injury to our crops of the Hessian-fly, Wheat-midge, Cab- bage-maggot, Onion-maggot, etc. There are, in fact, but two families, Syrphidse and Tachi- nidie, which can be looked upon as beneficial to the cultivator, though many act the part of scavengers. jSTo insects, not even the Lepidoptera, furnish such a variety of curi- ous larval characters, and none, x^erhaps, offer a wider or more interesting field of in- vestigation to the biologist. It is diflicult to give any very satisfactory arrangement of these Two-winged flies, though they easily These are: 1st,I!^emoceba, or. Fig. 24.—a Hawk-fly (Erax has- tardi). a perfect insect; b, pupa; larva shown at side. fall into two rather artificial sections those with long antennae, having more than six joints, and palpi hav- ing four or five joints The i)upa is naked, as in the Lepidoptera, with the hmbs exposed. This kind of pupa is called oMected. 2d, Bragho- CERA, or those with short antennae, not having more than three distinct joints, and x)alpi with one or two joints. The pupa is mostly coarctate, i. e., is formed within, and more. Please note that these images are extracted from scanned page images that may have been digitally enhanced for re
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
