ME. LUBBOCK ON THE OVA AND PSEUDOVA OF INSECTS. 
365 
Coccus Persicce . — On the 22nd of May I found in our garden some specimens of 
C. persicce, which I was much surprised to find is oviparous and not nearly ovoviviparous, 
like C. hesperidum. The females were, at the period in question, rapidly approaching 
the term of their existence, and most of them had already laid many eggs. These 
latter are developed almost in a similar manner to those of the preceding species, 
with however some interesting differences. 
The form of the ovaries and arrangement of the egg-tubes is very nearly the same in 
both species. The spermatheca of C. persicce, however, is less firm, and is pale in colour. 
The colleterial glands, which, probably in consequence of that species being ovoviviparous, 
have become small and inconspicuous, are in the Peach-coccus large and pedunculated. 
They are six in number, four large and two small, these latter being apparently 
attached by a short stalk to the peduncle of the large one, which is furthest from the 
vulva. They lie three on each side, and then’ ducts open into the egg-canal close 
together, and about half-way between the vulva, and the division of the egg-canal into 
two oviducts. 
The internal structure is very distinct and interesting. It consists of many cells 
l}fing loose in the internal cavity, and resembling very much in form, size, and appear- 
ance the vitelligenous cells of the egg-follicle. Indeed, if one of these bodies was lying 
free from its attachments, I believe it would be quite impossible to decide whether it 
belonged to these colleterial glands or had come from an egg-follicle. I counted about 
six in the smaller glands, and from twenty-five to thirty in each of the large ones ; they 
were nearly the same size in all the glands. 
As might be expected, several specimens did not show this structure, but in others it 
was very distinct. In one specimen the glandular bodies were more numerous and 
smaller. In this case, however, they varied considerably in size. 
The egg-follicle is tougher, and the epithelian layer is more distinct than in the pre- 
ceding species. The number of vitelligenous cells is greater, varying between five and 
eight in each chamber, and they are also more distinct and rounder. 
As might be expected, their number does not depend upon the age of the follicle. I 
have seen a very young one with seven cells, and have often found old ones with only 
five. The size sometimes varies considerably in the same follicle, and did not appear to 
depend upon the stage of growth. 
The nucleus of the cells could almost always be distinguished. It consists of an irre- 
gularly-shaped body of a greenish colour, and presents often projections which appear 
to be undergoing a process of separation. Sometimes this appears to have taken place, 
and we find then two to four smaller and more regular nuclei. 
They never contained granulations, like those described by Huxley, in the corre- 
sponding cells of Aphis. 
They appear finally to break up and to be absorbed, exactly as has been already 
described ; but it is difficult to prove this satisfactorily, as in large follicles their cell-wall 
becomes very indistinct. 
MDCCCLIX. 3 Q 
