1913] 
Pearse, Notes on Eubranchipus dadayi. 
115 
to clasp females which had eggs in the median portion of the 
ovisac. 
In order to ascertain what differences in behavior would ap¬ 
pear when males were placed with the two types of females, tests 
were made in which twenty-four males and eighteen females were 
used. Six males and an equal number of females had been left 
in pairs in six small dishes for half an hour and five pairs had 
copulated. All these were dumped into a larger dish which con¬ 
tained eighteen other males and allowed to remain for five min- 
ues; the females were then removed. Six other females having 
the eggs in the median ventral portion of the ovisac were next 
placed in the dish with the twenty-four males and left five minutes ; 
these were then removed and replaced by six females with eggs 
on the sides of their ovisacs, and were left for a similar period of 
time. The number of clasps and copulations in each case is shown 
in Table I. Females which had recently copulated or which had 
eggs in the lower part of the ovisac did not submit to the clasp of 
the males. 
TABLE I. 
Showing the number of times three lots of six females were 
elapsed or copulated zvith when placed with twenty-four males; 
five minuates for each lot. April 28, 1912. 
Condition of Females. 
Time, a. m. 
Clasps. 
Copula¬ 
tions. 
6 females that had been with 
males for half an hour. Five 
of them had copulated. 
10 :40 
to 
10 :45 
11 
0 
6 females with eggs in median 
ventral portion of ovisac. 
10 :53 
to 
10:58 
5 
0 
6 females with eggs on sides of 
ovisac. 
11:10 
to 
11:15 
10 
3* 
•) It was difficult to get females with the eggs on the sides of the 
ovisacs—apparently most had changed to the other condition. 
Of the three which did not copulate, one died immediately after 
the experiment, the other two were very small and although a 
male tried persistently to copulate with one of them, he was un¬ 
able to do so. 
