. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. THE FOUR-WINGED PARASITES 185 developed into a thousand flies. Of how many flies would she be the mother ? Do you wonder that these parasites are important ene- mies of injurious insects, and are often able to check seri- ous outbreaks of great crop pests ? The Proctotrypid Flies The third great group of insect parasites is that of the Proctotrypid Flies. These are nearly all very minute crea- tures somewhat similar to the chalcid flies. A large pro- portion of them develo
. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. THE FOUR-WINGED PARASITES 185 developed into a thousand flies. Of how many flies would she be the mother ? Do you wonder that these parasites are important ene- mies of injurious insects, and are often able to check seri- ous outbreaks of great crop pests ? The Proctotrypid Flies The third great group of insect parasites is that of the Proctotrypid Flies. These are nearly all very minute crea- tures somewhat similar to the chalcid flies. A large pro- portion of them develop in the eggs of other insects, sev- eral sometimes emerging from a single host egg. Many of them are parasites upon parasites, and some undergo a development of many larvas from one egg, as in the case of some of the chalcids. There is one giant in this family. It is the strange Pelecinus Fly pictured below. Apparently it is a parasite of the white grub — the larva of the common May beetle. The female Pelecinus is much smaller than the male and is a very different-looking Pelecinus Fly. 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 Weed, Clarence Moores, 1864-1947. Boston ; New York : D. C. Heath & Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1910
