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POMONA JOURNAL OF ENTOMOLOGY 



first, is centrally yellow, and later brown or red, while about the margin it is 

 gray. The thorax of the female is much broader than the abdomen, and 

 reaches around and projects back of the latter, so that the insect appears to be 

 deeply lobed behind. Figure 12 shows a greatly enlarged view of the female. 



Figure 13. Young of Chrysomphalus aurantii 



The markings of the anal plate, or last segment of the abdomen, as with all 

 scale, is characteristic of the species. The figure shows the eggs and young 

 which may often be seen through the semi-transparent crust of the insect. 

 Early (Figure 13) the legs, eyes, antennae and mouth-parts may be seen, but 

 all of these, excepting the mouth-parts disappear with the first moult. The 



Figure 14. Pygidium of Chrysomphalus aurantii 



head and thorax are closely joined, and back of these is tlie abdomen, which 

 in this species consists of four segments. The last segment, the pygidium, is 

 marked with plates and lobes, (Figure 14), which are necessary often 

 to identify species, and can only be studied by use of the compound microscope. 



