. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 474 OTHER BLOOD-SUCKING FLIES resemble mosquitoes except for the al)sonce of the loufi pioljoscis, and the (huicing flocks of these insects which can be seen over pools or swamps on any summer day are usually taken for mos- (juitoes without (luestion. As express(>(l by Hilcy and .loliann- sen, " these midges, especially in spiing or autumn, are often seen in immense swarms arising lik(> smoke over swamjis, and pro- ducing a humming noise which can be heard for a consi(l(>rable
. Animal parasites and human disease. Insects as carriers of disease; Medical parasitology. 474 OTHER BLOOD-SUCKING FLIES resemble mosquitoes except for the al)sonce of the loufi pioljoscis, and the (huicing flocks of these insects which can be seen over pools or swamps on any summer day are usually taken for mos- (juitoes without (luestion. As express(>(l by Hilcy and .loliann- sen, " these midges, especially in spiing or autumn, are often seen in immense swarms arising lik(> smoke over swamjis, and pro- ducing a humming noise which can be heard for a consi(l(>rable ; In such swamps the larva", most of which are afiuatic and live in the nmd or amid aquatic vegetation, may be scooped u]\ literally }\v the shovelful. Fortunately the great majority of these insects are quite harndess. in fact, inasnuich as the larvie are an important food for young fishes, they are distinctly beneficial. The blood-sucking species belong to the subfamily. Fio. 210. Life ;- of blood-suoking nudse, Culicoidps: A. liriult malo {C. relirula(us), X 5; B, eggs (C. mnrium), X IS; C, hirva (C. relicnlatux). X o; D, pupa (C. marium), X 10. (After Lutz.) Ceratopogoninsp and are very small; only the fiMiiales ai-e known to suck blood. The}' are well known to hunters and anglers and other frequenters of the wootls in most parts of tlie world. In America they are usually called " gnats " or " punkies " and in the West are known as " no-see-ums," on accouni of their v(>rv small size. These insects (Mg. 21()) can usually be distinguisheil from allied insects by the peculiar xcnation of the* wings, the hrst two veins being very heavy whil(> the others ar(> indistinct. Though the bodies, and sometimes to a slight degree the wings, are more or less hairy the sc'des so cli;ir;icteristic of nios(|uitoes are al>- sent. The proboscis is never long e\-en in the blood-suckers, and one is led to marvel at the irritation wiiich
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmedical, bookyear1918
