. Injurious insects of the farm and garden. With a chapter on beneficial insects. Insects. 290 IKJUEIOUS INSECTS person, on comparing the beaks of the two, will never mistake one for the other. Another way to distinguish the injurious ones from our friends, is by the disagreeable odor given off by the former, while the beneficial ones, so far as I know, are free from the odor. The two-winged flies—order Diptera—furnish the agri- culturist with but few directly beneficial insects, and these are the pretty, bright-colored Syrphus flies, and the dull-colored, parasitic Tachina flies. But there ar
. Injurious insects of the farm and garden. With a chapter on beneficial insects. Insects. 290 IKJUEIOUS INSECTS person, on comparing the beaks of the two, will never mistake one for the other. Another way to distinguish the injurious ones from our friends, is by the disagreeable odor given off by the former, while the beneficial ones, so far as I know, are free from the odor. The two-winged flies—order Diptera—furnish the agri- culturist with but few directly beneficial insects, and these are the pretty, bright-colored Syrphus flies, and the dull-colored, parasitic Tachina flies. But there are many that act the part of scavengers while in the larva state—as the house and flesh flies—while others are very annoying, as the mosquito and horse-flies. In the order Orthoptera, including grasshoppers, crick- ets, cockroaches, etc., we fail to find any that are useful. Fig. 171.—lAOB-WINOED CHRTSOPA. to man, and so pass them by and stop at the last order, Neuroptera, where nearly all are carnivorous. These insects are called nerve-winged, because the veins in their wings look like net-work. The Mosquito Hawk or Dragon-fly is a good example of this order, as are also the pretty little Lace-wing flies (Chrysopa), seen in figure 171 in all their stages. The larvae of these Lace-wings eat the Plum Curculio and the Pear Slug, and probably many other noxious insects. The eggs of the Lace-wings are each attached to a long foot-stalk, and all fastened to a leaf or blade of grass, as seen at a, figure 171. The per- fect insect, d, is a pretty, pale-green, gauzy-winged crea- ture, with prominent, shining, golden 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 Treat, Mary, b. 1835. New York, Orange Judd
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectinsects, bookyear1887
