540 Cc. H. RICHARDSON 
taining vacuoles of various sizes which are quite evenly distrib- 
uted. None of these vacuoles have been seen extruding from 
the periphery of the cells. The nucleus is also oval in outline 
and densely granular, varying from about 16 to 20u in greatest 
diameter. The chromatin granules are of two sizes, the most 
abundant of which are small and irregular, while the less numer- 
ous ones are larger and rounded in outline. 
Leucocytes were seen adhering to the periphery of the larval 
oenocytes only in a few instances and in very small numbers. 
It was certainly not as common a phenomenon as Weissenberg 
observed in Torymus. 
The larval oenocytes were often so closely applied to one 
another as to suggest that they may have divided amitotically. 
However, there was nothing in the condition of their nuclei to 
warrant such a view and I am inclined to believe that this close 
association was due to the action of the reagents. 
In the young pupae with a thin yellowish cuticula, the larval 
oenocytes were larger, but no signs of degeneration were visible. 
In the advanced pupae, the nuclei became crescentic or amoebi- 
form (figs. 11 and 12), and the cytoplasm was often constricted 
off into definite lobes. At the same time, a garland of rather 
indistinct vacuoles appeared near the periphery as observed by 
Weissenberg. These agree perfectly with the degeneration stages 
in Torymus. 
The imaginal oenocytes (fig. 13) lie in groups in cup-like de- 
pressions formed by the evaginated dorso-lateral imaginal dises 
which produce externally the lateral tubercles described above. 
We are thus given a clew to the meaning of these late-appearing 
larval structures. The imaginal oenocytes occur beneath the 
tubercles on the fifth to the eleventh segments, precisely those 
on which the tubercles are most strongly developed. The dorsal 
imaginal dises on the second and twelfth segments are but slightly 
thickened and bowed outward, so that the tubercles on these 
segments are weakly developed. Segments three and four are 
those upon which the histoblasts of the wings are found. These 
lie in pockets beneath the larval cuticula, but their outer sur- 
faces are somewhat curved outward so that they simulate feeble 
tubercles. 
