358 ME. LUBBOCK OK THE OYA AKD PSEUHOYA OE IKSECTS. 
egg-tube, because it is not divided into egg-chambers; but in this they only resemble 
the egg-tubes of other Hymenoptera, which are quite cylindrical as long as they retam 
their outer membrane. It is the inner membrane only which is constricted. 
Secondly, M. Leon Dufour found in them no eggs ; but if he had examined fresh 
specimens with a powerful glass, he would have found in them a succession of eggs as 
usual, but more numerous than in most of the H^mienoptera. Each egg is formed on 
the normal type, and consists of a double chamber, the lower half containing the time 
yelk, and the upper being full of the vitelligenous cells. It appeared to me that the 
vitelline membrane was in these eggs developed earlier than usual ; for on cutting the 
lower part of the egg-tubes the eggs came out, and both the germ-chamber and the 
yelk-chamber appeared to be enclosed in a common membrane (Plate III. tigs. 13 
to 17). By the time, however, that the eggs had reached the matrix the constriction 
had disappeared, and they were now cylindrical bodies, slightly larger at one end than 
the other. 
If, however, some of the eggs are removed from the matrix and put in water, one end 
of the greater number of them will gradually swell until many resemble Plate XYIII. 
fig. 17. This alteration in shape, however, appears to be due to endosmosis, and I never 
saw the eggs take any other form. I had forgotten, during my examination of them, that 
M. Leon Dufoue, attributed to them “ une contractilite spontanee de tissu, and m) atten- 
tion was not specially directed to this point, but I did not notice anything of the sort. 
The swollen end of the eggs often showed minute circular marks. I never was able 
to see the deposition of the eggs, and cannot say therefore that the species is not ovo- 
viviparous. The eggs, however, never showed any distinct traces of an embryo ; and 
having explained away the appearances on which that opinion was founded, I think 
myself justified in concluding that Chelonus is oviparous like the other Hymenoptera, 
although the process of egg-formation certainly does offer various peculiaiities. 
DEVELOPMENT OE PSEUDOVA. 
Coccus hesperidum.—TYie generative organs of Coccus consist of a short egg-canal, which 
has more or less largely developed colleterial glands, and at its upper end separates into 
two tubes, each about of an inch in length, and constituting the ovaries. The 
whole surface of these two tubes is covered with egg-tubes in all stages of development, 
from a mere bud to an almost mature embryo. The ovary passes gradually into the 
oviduct, or rather the latter can hardly be said to exist as a distinct part of the system. 
The spermatheca is a pyriform gland lying between the two ovaries, and connected 
with them by a duct which is attached to the egg-canal between the two ovaries. 
It is correctly described and figured by Dr. Leydig, as it appeal’s under the action of 
acetic acid, but in water or syrup it is coloured yellow by its contents. These ai'e i ery 
minute, strongly refracting, yellow granules or globules, which ofier no resemblance 
whatever to spermatozoa. 
This organ is certainly homologous with the spermatheca of other allied species. 
