202 
Psyche 
[December 
Fig. 3. Effect of distention of the uterus on inhibition of the corpora 
allata during early gestation in N. cinerea. Solid circles — Carrying oothecae 
(controls). Five to 18 females per point (N = 276). Open squares = oothe- 
cae removed <24 hr. after ovipositing; no glass tube inserted in uteri. Five 
to 16 females per point (N — 65). Solid squares — Oothecae removed <24 
hr. after ovipositing, glass tube (3-3.5 mm. X 10-11 mm.) inserted in 
uteri. Four to 10 females per point (N — 99). Open triangles — Oothecae 
removed 10-11 days after ovipositing; no glass tube inserted in uterus. 
Three to 12 females per point (N = 65). Solid triangles = Oothecae 
removed 10-11 days after ovipositing; glass tube (3-3.5 mm. X 10-11 
mm.) inserted in uteri. Four to 10 females per point (N = 42). Vertical 
bars are one standard error but only one-half the error is indicated where 
they overlapped ; no bars indicate standard errors of ± 0.02 mm. or less. 
A single curve is drawn through open triangles and open squares (see 
text for explanation). 
the average time to oviposit again after the initial oviposition was 
about 33 days and for this reason in figure 3 (A and □ ), a single 
curve is drawn through the points for females whose oothecae were 
removed about 24 hours, and 10 - 11 days after oviposition. Eventu- 
ally, inhibition of the corpora allata ceased in females with glass 
tubes in the uteri and the oocytes developed. This also occurs in 
normal pregnant females in late gestation (fig. 1). Inhibition may 
