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Explanation of Plates, 
All the photographic reproductions are from our own negatives except photo 1, 
plate XII which is from a negative made by Dr. James H. Stebbins, Jr. 
Photos 1 — 4 are from sections. 
Photos 5 — 88 are from our smear preparations, stained with Bismarck brown. 
None of the negatives or prints liave been retouched in any way. 
Plate XII. 
Fig. 1. + 180. Drawing by O. Cassas. Longitudinal section through a terminal 
chamber of one of the tubes of an ovary. The insect was captured while mating 
and the ovaries were removed at once. Fixative, Flemming’s strong fluid. Stain, 
iron haematoxylin. 
In nearly all the tubes of this ovary one egg chamber was formed each containing 
an egg with a large germinal vesicle The early development of the egg chamber and 
the direct Connection between the egg and the canal in the centre of zone B are clearly 
demonstrated in this figure. Delicate branches of the canal are plainly seen ramifying 
between the large cells of zone B. The widest area of the canal is not sliown in this 
section. 
Fig. 2. + 180. Drawing by A. Bessin. Longitudinal section through a terminal 
chamber of one of the tubes of the second ovary of the individual from which the 
