192 
Katharine Foot and E. C. Strobell 
most clearly demonstrated tlie three forms of nuclei which liave given 
rise to so much discussion — tlie food cells (“Xahrzellen”), the epithelial 
cells and the germ cells. 
Figs. 1 and 2 are drawings of a longitudinal section of the terminal- 
chamber (Endkammer) of one of the seven tubes of a mature ovarv. 
The ovaries were removed front a living specimen, captured while mating, 
and both ovaries sltowed the same external characters. There were no 
chitinous (brown) eggs in any of the tubes, each tube having developed 
onlv a single egg chamber which contained a nonchitinous (bluish) egg. 
Ovaries removed front individuals during the period in which they 
are depositing eggs show a further development of the egg chambers. 
At this time several of these chambers are present showing a graded 
series of development, the eggs in the chambers at the posterior end of 
the tubes being as hard and chitinous as those just deposited and having 
nearly the same mahogany brown color. The younger eggs are white 
with a bluish tinge, the blue changing to a clear sky blue, then becoming 
yellow and gradually deepening to brown. As a rule the eggs are brown 
or dark yellow when deposited. 
Figs. 1 and 2 demonstrate that the terminal chambers of Protenor 
are differentiated into three qtiite distinct zones. For the sake of con- 
venience we shall designate these zones, A, B and C and each zone has 
distinctive features w T hich are easilv recognized. Zone A is at the apex 
of the terminal chamber and includes about 1 / 6 of its entire area. The 
most obvious featmes which differentiate this zone from zone B are the 
relativelv small size of the nuclei and the weaker response of this area 
to the chromatin stains. These two characteristics are further demon- 
strated in photos 1 und 2. 
The most obvious featmes characterizing zone B are the large 
nuclei, showing great Variation in form and structure and an intense 
tenacity of the chromatin stains. Figs. 1 and 2, plate XII and photos 
1 and 2 plate XIII. 
Zone C is characterized by features somewhat similar to zone A, 
the nuclei are smaller, the entire zone representing a definite area which 
stains more faintly than zone B. 
These areas, dividing the terminal chamber into three distinct zones, 
liave been found to be characteristic of the ovarv of many insects. 
Preusse (1895) Supports Will’s and Korschelt’s observations on this 
point and describes these areas in Xepa as follows: ‘"Das Innere der 
Endkammer wird von drei Zellbezirken eingenommen. Den hinteren 
Teil bildet das bereits abgehandelte Keimlager, daran schließt sich der 
