. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 42 ECONOMIC ENTOMOLOGY Tragus, which parasitizes the chrysalids of Papilio; and Ophion, a form with a compressed body, which lives on the Polyphemus moth and yellow-necked caterpillar. The Braconids (Braconidce) are smaller and are also parasitic. The most common genera are Microgaster, whose cocoons are often found on the backs of sphinx and cabbage butterfly larvae; and Aphidius which parasitizes plant-lice. Chalcids
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 42 ECONOMIC ENTOMOLOGY Tragus, which parasitizes the chrysalids of Papilio; and Ophion, a form with a compressed body, which lives on the Polyphemus moth and yellow-necked caterpillar. The Braconids (Braconidce) are smaller and are also parasitic. The most common genera are Microgaster, whose cocoons are often found on the backs of sphinx and cabbage butterfly larvae; and Aphidius which parasitizes plant-lice. Chalcids or chalets flies iChalcididcB) are minute metallic insects. One species, Pteromalus puparum, is a parasite of the chrysalids of the. Fig. 41.—Female of Megarhyssa (Thalessa) ovipositing. cabbage butterfly. Another, Aphelintis, is parasitic on scale insects (see also p. 354). Proctotrypids are very minute parasitic hymenoptera often prey- ing upon the eggs of other insects. Besides these parasitic forms there are predaceous Hymenoptera, such as the mud-wasps, digger-wasps, wood-wasps, etc., that feed their larvae on insects. They fill the brood cells with caterpillars, grass- hoppers, plant-Hce, or grubs of small beetles or flies. Sphecius makes use of cicadas as food for its young. Several families of the Diptera are either parasitic or predaceous. The two best known are the Tachinids and the S>Tphids. Tachinids or tachina flies {TachinidcB) are bristly flies closely related to the ordinary house-flies. They parasitize many kinds of caterpillars. 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 Lochhead, William, 1864-. Philadelphia, Blakiston
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
