130 LECANIUM OLE^. 



Fig. 8. Portion of ventral derails with spinnerets. 



X 600. 



Fig. 9. The same with, large spine. X 600. 

 Fig. 10. Stigmatic spines of the adult female. 



X 300. 



Fig. 11. Female at period of gestation, x 10. 

 Fig. 12. Female, first stage. X 20. 

 Fig. 13. Puparium of male (after Green). X circa 



25. 



G-ENUS PHYSOKERMES (Targioni-Tozzetti). 

 (PI. LVIII, figs. 1-11 ; PL LIX, figs. 1-5, 5 b.) 



In both the larval and second stages of the female 

 this genus is inseparable from Lecanium. But the 

 adult female is both destitute of legs and antennae, and 

 at the period of parturition the body is divided by a 

 central septum or body-wall into two internal cavities 

 or pouches for the reception of the ova. In order to 

 understand the complex structure of the internal parts 

 of this remarkable insect a careful study of the figures 

 on PL LVIII should be made. 



On removing an adult female from the branch of its 

 food-plant, in its external characters it is seen to some- 

 what resemble a species of Kermes ; more especially do 

 the forms which fix themselves in the bifurcations of 

 the branches ; but the cephalic extremity is always 

 more or less attenuated. There is always a deep 

 ventral slit present, and the posterior extremity is 

 furnished with two blunt cornicles. By partly em- 

 bedding the insect on its side in wax and cutting 

 off a portion of the exposed lateral half of the body, 

 the structure of the interior may be made out (PL 

 LVIII, fig. 3). The abdomen (6) varies in thickness 

 according to the age of the insect : at the commence- 

 ment of parturition it is very thick, and nearly fills the 

 whole of the pouch or cavity (c) ; but in the penultimate 

 stage, which is that shown in fig. 3, the body is thin,. 



