172 
Psyche 
[December 
AGE WHEN MATED (DAYS) 
Fig. 3. Relationship between age at mating and ovulation (as indicated by 
oviposition) in 4 species of cockroaches. Each point represents one female. 
(N — 356 for Leucophaea ) . 
38% of the virgins oviposited after the thirty-fifth day as compared 
to 13% of mated females. 
Fifteen virgin females allatectomized when 1 to 2 days old did not 
produce oothecae within more than 50 days. At 52 to 210 days after 
allatectomy, corpora allata were implanted ; 9 females ovulated in less 
than 82 days and one oviposited in 128 days; 3 died without oviposit- 
ing and two dissected after 150 days had small undeveloped oocytes. 
One allatectomized female that oviposited after receiving corpora 
allata implants had well developed oocytes although the ootheca was 
in the uterus (fig. 14D). Of 25 sham operated females 16 oviposited 
in less than 56 days. We don’t know how to account for the delay in 
ovulation after implantation of corpora allata into allatectomized 
females. Four pregnant females (i.e. with an ootheca in the brood 
sac) had corpora allata implanted and were dissected at 35 to 41 days 
of pregnancy. Their oocytes measured 4.90 to 6.81 mm. in length 
