366 ME. LUBBOCK ON THE OVA AND PSEUDOVA OF INSECTS. 
In the early stages of egg-development there appear to be fewer oil-globiUes than in 
C. hesperidum, but more numerous granules. These latter are about le.ooo ^ 
meter, and are congregated principally round the gentninal vesicle. They disappear 
subjected to the action of tartaric acid. 
The germinal vesicle is small, but it is so much covered by the granules that I never 
could obtain a satisfactory view of it, and still less of the nucleus. It is, however, smaller 
than the vitelligenous cells. 
The production of the parasitic green cells occurs in the same maimer and position 
as in a hesperidum. Instead of being oval, however, they are shaped like a sausage. 
They are 3^00 in length by about Wo 0 breadth. They are, however, multiphed by 
division, and consequently vary in size as much as the corresponding parasite of C. hespe- 
ridum ; and in one specimen I found them much longer than usual. 
In an egg almost full-grown the contents were of two sorts; fii'st, oil-globules from 
8T^ to ^ in diameter, and of a whitish colour; and, secondly, small globules 3000 
to in diameter. These latter are rendered invisible by tartainc acid. The eggs 
when laid are of a brdliant white colour, two in length, and ywo m breadth. ey 
generally showed the commencement of the blastodermic layer, and in some this had 
even extended quite across the egg. 
The oil-globules are by far the most conspicuous part of the egg-contents; the 
remainder appears to consist of a periplastic substance. 
The small granules, which at an earlier period were very numerous, have almost dis- 
appeared ; and the yelk-globules, which are so conspicuous in G. hesperidum, were m the 
present species very few and of a small size. 
The outer surface of the egg-shell is covered by minute rings, of which the ends some- 
what overlap. These rings are from Ww io Ww diameter, and ai’e no doubt iden 
tical with the white substance which exudes from pores on the imderside of the body. 
Immersion in spirits of wine for thirty-six hours had no apparent effect on them. I also 
placed them in dilute sulphuric acid for two hours and a half with the same result. 
In June the females covered a number of eggs, besides those which were not yet 
deposited. I examined a good many of the former, and found that each contained an 
embryo consisting of a waved line of small nucleated cells, extending from one end of 
the egg to the other*. 
Oyrdps Although the gall insects are so common and so numerous, the 
female sex only has yet been found, so that the males are probably only produced 
at distant intervals. Except, however, in so far as the peculiar shape of the egg is 
concerned, the mode of egg-formation does not differ from that which occurs in ot er 
Hymenoptera. , 
The ovary consists of a great number of tubes, which form a verticiUated bunch, an 
fall into a common oviduct. Each tube contains about thirteen eggs (figs. 2 and 3 ); 
in the earliest stages there is absolutely nothing to distinguish the egg-formation m this 
* Letdig, loc. cit. pi. 1. fig- 4; i. 
