Principal household insects of the United States . ow were conducted by Mr. 1>. W.( oqaiUett. 46 PRINCIPAL HOUSEHOLD INSECTS. top of which vras covered with gauze, and twenty flies was at noon ; by 1 oclock in the afternoon no eggs could be found,but at J> oclock the next morning two clusters of eggshells, one clustercontaining 2G and the other 45 eggs, were found. The eggs had beendeposited in small cavities between the sides of the vessel and themanure, at a depth of about a quarter of an inch below the surface,but were not arranged in any regular order. Afterwards seve
Principal household insects of the United States . ow were conducted by Mr. 1>. W.( oqaiUett. 46 PRINCIPAL HOUSEHOLD INSECTS. top of which vras covered with gauze, and twenty flies was at noon ; by 1 oclock in the afternoon no eggs could be found,but at J> oclock the next morning two clusters of eggshells, one clustercontaining 2G and the other 45 eggs, were found. The eggs had beendeposited in small cavities between the sides of the vessel and themanure, at a depth of about a quarter of an inch below the surface,but were not arranged in any regular order. Afterwards several black-berries, cherries, and partly decayed apples were placed in this vessel,and more Hies were introduced. xV single e^^ was found the next dayon the upper side of one of the blackberries. At a later date experi-ments were tried in the same jar with fresh cow manure. Apparentlyno eggs were deposited until the third day, when two small clusterswere observed. These hatched in due time, but all the larvae died before attaining full growth. $ %. CL J? Fig. 15.—Musca domestica: «, pupa removed frompuparium; b, hind end of body of larva, in secondstage; c, anal spiracles of larva in first stage—allenlarged (original). These experiments werehardly extensive enough to al-low us to generalize, but so faras they go they seem to showthat horse manure is the favoritebreeding place of the house observations madeupon the offspring of flies whichbred most freely in this last-named substance indicated thatthe larva) molt twice and thatthere are thus three distinctlarval stages. The periods ofdevelopment were found to beabout as follows: Egg from de-position to hatching, one-thirdof a day; hatching of larva tofirst molt, one day; first to second molt,one day; second molt to pupation, three days; pupation to issuing ofthe adult, five days; total life round, approximately ten days. Thereis thus abundance of time for the development of twelve or thirteengenerations in the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsectp, bookyear1896
