. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. SLIME SLUGS, MYRIAPODS AND INSECTS 147 also a pair of maxillary palpi, as long as the beak in both males and females of some mosquitoes, but shorter in the females of most species. Mouth-parts of House-fly.—-The mosquitoes belong to the order of two-winged flies, but their mouth-parts cannot be taken as typical of the order. A house-fly, for example, has a mouth very different in make-up. The labium is a fleshy proboscis expanded at the tip to form a special lapping and rasping organ, and there are no mandibles or


. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. SLIME SLUGS, MYRIAPODS AND INSECTS 147 also a pair of maxillary palpi, as long as the beak in both males and females of some mosquitoes, but shorter in the females of most species. Mouth-parts of House-fly.—-The mosquitoes belong to the order of two-winged flies, but their mouth-parts cannot be taken as typical of the order. A house-fly, for example, has a mouth very different in make-up. The labium is a fleshy proboscis expanded at the tip to form a special lapping and rasping organ, and there are no mandibles or maxillae, at least in functional condition. There is one pair of short. FIG. 63.—Mouth-parts of the house-fly, Musca domestica. lb., Labrum; mx. p., maxillary palpi; //., labium; la., labellum. palpi which are usually called the maxillary palpi, although they may really belong to the labium. The house-fly takes up food either by lapping liquids with the broad tongue-like end of its proboscis, or by rasping off bits of solid food, pouring out saliva over them and then lapping them up as a fluid mixture. The end of the proboscis,which is called the labellum, is very elaborately contrived and furnished with ridges for rasping and special muscles for folding and unfolding. Mouth-parts of Butterflies and Moths.—The sucking tube of the butterfly or moth is still another very different type of mouth. There is no labrum, mandibles nor labium, or only rudiments of them. But the maxillae are developed into a pair of long, slender, coiling pieces or processes which can be held together in such a way as to form by means of their grooved inner faces a perfect tube, long, slender and flexible. With this tube they suck out nectar from the nectaries. 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 Kellogg, Vernon L.


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