Elementary entomology . elementaryentomo00sand Year: [c1912] FIG. 346. The house-fly. (Enlarged) a, larva, or maggot; b, puparium ; c, adult. (After Howard, United States Department of Agriculture) 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 ccurse, peculiar to this order. A few of the parasitic families are
Elementary entomology . elementaryentomo00sand Year: [c1912] FIG. 346. The house-fly. (Enlarged) a, larva, or maggot; b, puparium ; c, adult. (After Howard, United States Department of Agriculture) 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 ccurse, peculiar to this order. A few of the parasitic families are wingless. The mouth-parts have already been referred to (see page 18) 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
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