. Class book of economic entomology [microform] : with special reference to the economic insects of the northern United States and Canada. Insect pests; Entomologie; Entomology; Insectes nuisibles, Lutte contre les; Insect pests; Insectes nuisibles. 42 ECONOMIC ENTOMOLOGY Tragus, which parasitizes the chrysalids of Pa^i/jo; and Ophion,-a. form with a compressed body, which lives on the Polyphemus moth and yellow-necked caterpillar. The Braconids (Braconida) are smaller and are also parasitic. The most common genera are Microgaster, whose cocoons are often found on the backs of sphinx and cabba
. Class book of economic entomology [microform] : with special reference to the economic insects of the northern United States and Canada. Insect pests; Entomologie; Entomology; Insectes nuisibles, Lutte contre les; Insect pests; Insectes nuisibles. 42 ECONOMIC ENTOMOLOGY Tragus, which parasitizes the chrysalids of Pa^i/jo; and Ophion,-a. form with a compressed body, which lives on the Polyphemus moth and yellow-necked caterpillar. The Braconids (Braconida) 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 larva; and Aphidius which parasitizes plant-lice. Ckalcids or chalcis flies (Chalddida) are minute metaUic insects. One ,,ecies, Pleromalus puparum, is a parasite of the chrysalids of the. Fit. 41.—Female of Megarhyssa (Thalessa) ovipositing. Another, Aphelinus, is parasitic on scale insects cabbage butterfly, (see also p. 354). Proctolrypids are very minute parasitic hymenoptera often pre>- ing upon the eggs of other insects. Besides these parasitic forms there are predaceous such as the mud-wasps, digger-wasps, wood-wasps, etc., that feed their larvie on insects. They fiU the brood cells with caterpillars, grass- hoppers, plant-lice, or grubs of small beetles or flies. Sphecius use of cicadas as food for its young. Several families of the Diptera are either parasitic or predaceoiv The two best known are the Tachinids and the Syrphids. Tackinids or tachina flics (Tachinida) are bristly flies closely relai li to the ordinary house-flies. They parasitize many kinds of caterpill:: rs. 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, 1864-1927. Philadelphia : P. Blakiston's Son
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectentomology, bookyear1
