. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. CHAPTER IX The Two-winged Flies So far as numbers of individuals are concerned, the Two-winged Flies of the order Diptera are among the most abundant of all insects. These are distinguished by the fact that there is but one pair of wings, al- though in most species there is a pair of curious little projections called halteres or "balancers" which represent the second pair of wings. The flies have com- plete transformations, and in the larval state commonly ex- is
. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. CHAPTER IX The Two-winged Flies So far as numbers of individuals are concerned, the Two-winged Flies of the order Diptera are among the most abundant of all insects. These are distinguished by the fact that there is but one pair of wings, al- though in most species there is a pair of curious little projections called halteres or "balancers" which represent the second pair of wings. The flies have com- plete transformations, and in the larval state commonly ex- ist as footless maggots. The mouth parts are formed for sucking, although there are often special modifications for biting, in connection with the sucking apparatus. Fortunately, there are comparatively few species of Dip- tera that are destructive to cultivated crops. Among these few, however, are some of the most troublesome of all in- jurious insects, such as the Hessian Fly, the Apple Maggot,. 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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