. Guide leaflet. Fig. 2. EGGS, LARVA AND PUPA OF THE FILTH FLY(Photograph of models in The Vmeri< in Museum ol Natui 1 Historj . IMERH. /.Y Ml SI-J .)/ Gl JIDE LR. IFLETS hibernate in any stage. At the termination of the pupal stage the flycomes out of the pupal case and crawls up to the surface of the ma;terial in which it pupated. Here its wings quickly harden and it isready to fly away. The rate at which generations of flies follow each other is deter-mined by the temperature. Studies made in the Laboratory ofPublic Health of the American Museum gave a total period fromegg laying to the
. Guide leaflet. Fig. 2. EGGS, LARVA AND PUPA OF THE FILTH FLY(Photograph of models in The Vmeri< in Museum ol Natui 1 Historj . IMERH. /.Y Ml SI-J .)/ Gl JIDE LR. IFLETS hibernate in any stage. At the termination of the pupal stage the flycomes out of the pupal case and crawls up to the surface of the ma;terial in which it pupated. Here its wings quickly harden and it isready to fly away. The rate at which generations of flies follow each other is deter-mined by the temperature. Studies made in the Laboratory ofPublic Health of the American Museum gave a total period fromegg laying to the emergence of the adult of days at 35° C, at 30° C, and days at 20° C. The adult fly lives upon liquid food, since its mouth parts are inthe form of a sucking proboscis, but by discharging a free flow ofsaliva it is able to turn foods like sugar into the fluid form it canabsorb. Total Permo Bettors 3% 1
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectnatural, bookyear1901
