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An attempt was made to illustrate by light-microscope photomicrographs and drawings the females meiosis and fertilization of Drosophila melanogaster. The centromeric regions of the meiotic prophase chromosomes form a chromocenter whereas the telomeric parts adhere to the nuclear membrane. The meiotic process is correlated with the successive stages in the development of the egg follicle.

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Details of the critical stages that precede the appearance of the metaphase bivalents in the female Drosophila melunogaster were studied in a comparison between whole-mount preparations and squash preparations. At the end of stage S,, the nuclear membrane breaks down, and the bivalents leave the chromocenter and become orientated on the first meiotic spindle. In stage S,4 a metaphase 1 plate with separate bivalents is formed. A renewed survey of female meiosis in Drosophila melanogaster in relation to egg follicle stages is presented.