. The animans and man; an elementary textbook of zoology and human physiology. that they will; indeed, they seem to lay eggs FIG. 37. Beak of female mos-only rarely when thus kept ^uit0 dissected to show the r Tr ,. piercing needle-like parts and in Confinement. If a slice of their sheath; m*./»., the max- banana be put in the jar the illary palpi, or feelers of themosquitoes may be seen to suck mouth- (Greaty magnified.)the sap from it, and they may be kept alive for many daysif given fresh banana every three or four days. If the egg-laying occurs, the life-history of our mosquitoes is com-pl
. The animans and man; an elementary textbook of zoology and human physiology. that they will; indeed, they seem to lay eggs FIG. 37. Beak of female mos-only rarely when thus kept ^uit0 dissected to show the r Tr ,. piercing needle-like parts and in Confinement. If a slice of their sheath; m*./»., the max- banana be put in the jar the illary palpi, or feelers of themosquitoes may be seen to suck mouth- (Greaty magnified.)the sap from it, and they may be kept alive for many daysif given fresh banana every three or four days. If the egg-laying occurs, the life-history of our mosquitoes is com-pleted. A new cycle is about to begin. Distribution of mosquitoes.—Mosquitoes are distributedall over the world, being found in enormous numbers inarctic regions and on high moutain ranges as well as inthe tropics, and in swamps and marshy valleys. Aboutfour hundred and fifty species, or different kinds, of mos-quitoes are known, nearly seventy of which are found inNorth America. Besides the irritation caused by theirbite, , piercing with the sucking beak, it has been. 92 THE ANIMALS AND MAN proved that mosquitoes are the conveyers and distributorsof the germs of malarial fever (see Chapter XII). Onlycertain kinds of mosquitoes, however, are all belong to the genus Anopheles; they may bedistinguished by the possession of spotted wings, as most ofthe innocuous kinds have the wings clear. There are a fewinnocuous or non-malarial kinds with spotted wings, how-ever, but no malaria-carrying kinds with wholly clear malaria-bearing kinds have the maxillary palpi long inboth male and female, while in the other kinds the femaleshave short palpi (fig. 37). Other kinds of mosquitoes arecertainly the distributors of the germs of yellow fever, andthe same kinds convey a terrible tropical disease calledelephantiasis. The most effective remedy against mosquitoes is to pour alittle kerosene on the surface of the pool in which the larvaeand pupae live. The
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