PLATE 17 



EXPLANATION OF FIGURES 



110 Longitudinal section through the brain of an embryo like the one repre- 

 sented in figure 51. 



111 Transverse section through the thoracic region of a Pseudococcus embryo 

 like the one represented in figure 72. 



112 Transverse section through the salivary glands of Pseudococcus. 



113 Transverse section through the third abdominal segment of the embryo 

 almost ready to hatch. 



114 Transverse section of a Pseudococcus embryo like the one represented 

 in figure 51. 



115 Another section of the same embryo as figure 114. 



116 A portion of figure 117 magnified. 



117 Oblique longitudinal section of an embryo. 



160 



