THE CONCHUELA. 
31 
Egg-laying capacity. — A summary of the Laboratory records 
regarding egg-laying capacity is presented in the following table: 
Table VI. — Egg-laying capacity of specimens of the conchuela collected in cotton field*. 
Lot. 
When Number of 
collected, females. 
Average Maximum 
number of number of 
eggs depos- 
it ed per ited per 
female. female. 
1905. 
A Julv 6 21 
B Aug. 12 
c Sept. 12 14 
D Oct. 13 L0 
131 321 
74 . (a) 
91 b 122 

a No individual records kept for this lot. 
t> This record is for the only female specimen isolated from others of same sex. 
The above records are based on females collected in the field, lot 
A at Tlahualilo, Mexico, and the remaining lots from Barstow, Tex. 
In all cases it may be presumed that the specimens had deposited 
eggs before the records began. From the fact that few nymphs 
were present, while the number of adults was rapidly increasing in 
the field where lot A was collected, it is probable that the migrating 
insects consisted of males and females which had recently reached 
maturity in the surrounding mesquite and arrived at the cotton field 
as a consequence of their search for a better food supply. The status 
of these insects in the mesquite as hereafter described adds further 
evidence to the support of this supposition. If we consider, accord- 
ingly, that the individuals of lot A had averaged to begin egg-laying 
one week before the above records begin, the daily rate being the 
same as for the remainder of the month, the average number of 
-L r L r ^ deposited by each female of the lot would be 150 and the maxi- 
mum number 340. 
Duration of fertility. — Four lots of insects were used in testing the 
duration of fertility in isolated females. The results are summar- 
ized as follow-: 
Table VII. — Duration of fertility in females of the conchuela isolated from males. 
Lot Xun l ber When 
number. ^"^ isolated. 
-irion of first 
infer*:: 
Deposition of last 
fertile egg. 
Date. 
Number 
of days 
after iso- 
tion. 
Number 
Date. i 
ac- 
tion. 
1905. 
1 5 Julv 10 
2 1 Julv 10 
3 5 Julv 10 
4 2 July 11 
1905. 
Aug. 11 
Sept. ID 
Aug. 1'' 
39 
1905. 
47 
Sept n 
Sept. 10 
44 
rage 

54 
