Sex Determination in Phylloxerans and Aphids 257 
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Fig. X A-I, polar spindle and polar body of male egg; A, polar spindle; B, dividing polar plate; 
C-I, polar body; F-0, polar spindle and polar body female egg; 7, telophase; K, outer pole of another 
telophase, inner pole lost; L-N, polar body; 0, polar body and female pronucleus with six chromo- 
somes; P-U, polar bodies of eggs, sex of egg not determined. 
