1980] 
Jackson — Dictyna & Mallos 
213 
“Immatures” were always individuals 2 mm or less in body length. 
Females of M. trivittatus tended to be 7 mm in body length; males, 5 
mm. The adults of the other two species tended to be 4-5 mm in body 
length. 
Statistical tests are from Sokal and Rohlf(1969). Transformations 
were carried out with the Mann-Whitney tests that permitted the use 
of tables for the Student t-statistic. 
MAINTENANCE OF MALLOS GREGALIS WITHOUT INSECT PREY 
Eight colonies were set up in large cages. Two males, two females, 
and two immatures were placed in each. The colonies were provided 
with Musca for two weeks, then all fly carcasses were removed. Any 
spider that died during this preliminary period was removed and 
replaced with another individual of the same sex/age class. Subse¬ 
quently, the colonies were maintained without insect prey until all 
spiders were dead. 
Each colony was observed for at least 5 min three times per day. 
morning, early afternoon, and late afternoon or evening. Elowever, 
periods of observation were generally much longer than this, since the 
colonies were kept on or near my desk and observed intermittently 
throughout the day when I was present. 
MAINTENANCE WITH INSECT PREY 
For these observations, the spiders were kept individually in small 
cages for 30 days and provided either one Musca or five Drosophila 
once per week. Each spider constructed its own web during the 30- 
day observation period. In addition to the total of 135 males referred 
to in Table 1 and to the 80 females and immatures of M. gregalis 
referred to in Table 2, 40 females and 40 immatures each of M. 
trivittatus and D. calcurata were set up. Twenty of each class were 
provided Musca; the other 20, Drosophila. 
In another 130 cases, females of M. gregalis were placed one per 
cage, then left for one week. One male M. gregalis was then placed in 
each cage and provided Musca (60) or Drosophila (70) as described 
above. In half of each of these groups, the females were removed 
before the male was introduced into the web. 
