. Elementary entomology. Entomology. CHAPTER XIV FLIES, MOSQUITOES, AND MIDGES {DIPTERA) Characteristics. Insects with one pair of wings borne by the mesothorax; the hind-wings represented by a pair of knobbed threads, called halteres; mouth-parts, suctorial; metamorphosis, complete. Ordinarily all sorts of small insects with membranous wings are indiscriminately called t^/Vj-, and the term " fly " has been used to form part of a compound name for insects of several different orders, such as May- fly, sawfly, gallfly, butterfly, etc., but, considered from the entomological stand- poi
. Elementary entomology. Entomology. CHAPTER XIV FLIES, MOSQUITOES, AND MIDGES {DIPTERA) Characteristics. Insects with one pair of wings borne by the mesothorax; the hind-wings represented by a pair of knobbed threads, called halteres; mouth-parts, suctorial; metamorphosis, complete. Ordinarily all sorts of small insects with membranous wings are indiscriminately called t^/Vj-, and the term " fly " has been used to form part of a compound name for insects of several different orders, such as May- fly, sawfly, gallfly, butterfly, etc., but, considered from the entomological stand- point, a fly is a two- winged insect of the order Diptcra. With this in mind, it is al- ways easy to distin- guish flies, as no other order has a single pair of wings (except the male scale insects), and the name of the order becomes significant, being derived from dis (two) and pteron (wing). The hind-wings are replaced by a pair of odd, club-shaped organs, called balancers, or halteres, which seem to be concerned with main- taining the equilibrium of the insect and are, of course, peculiar to this order. A few of the parasitic families are wingless. The mouth-parts have already been referred to (see page i8) and are fitted for sucking the juices of plants and animals, though in some there are strong, lancelike mouth-parts fitted for piercing, while in others a large, fleshy proboscis, fitted for rasping and lapping, is developed. 218. Fig. 346. The house-fly. (I*Lnlarged) a, larva, or maggot; /', puparium : c, adult. (After Howard, United States Department of Agriculture). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882; Metcalf Collection (North Carolina State University). NCRS. Boston, Ginn
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