Sept. 15, 1924 
Bruchus quadrimaculatus Fab. 
303 
Table III .—Longevity of 100 lone males and 100 mating males given water, 
honey, sugar water, and nothing 
Food given 
Longevity of lone males 
Longevity of mating males 
Maximum 
Minimum 
Average 
Maximum 
Minimum 
Average 
Water__ 
Honey___ _ 
Sugar water_ 
Nothing__ 
Average. 
Days 
54 
83 
88 
48 
Days 
3 
22 
21 
20 
Days 
33.6 
54.4 
58.08 
30. 96 
Days 
35 
60 
56 
22 
Days 
16 
16 
23 
13 
Days 
27.24 
27. 76 
36.84 
17.48 
44. 26 
27.33 
Table III shows that for both these 
groups of males, those which received 
no food lived the shortest average 
length of time, followed in order by 
those given water, honey, and sugar 
Avater. The maximum number of 
days lived by any individual of each 
group is in nearly the same ascending 
order. In each group the average 
length of time lived as well as the maxi¬ 
mum for an individual is greater with 
the lone males than with the others. 
A lone male lived a maximum of 88 
days while the maximum for a mating 
male was only 60 days. The average 
for all the unmated males was 44.27, 
compared with 27.33 for the other 
group. 
The lone males and the lone females 
in Tables III and IV were not separ¬ 
ated until some of them were known 
to have mated; in some instances, how¬ 
ever, single individuals of each sex 
had emerged in separate containers. 
As it is known that these weevils 
normally copulate frequently this ex¬ 
periment demonstrated that a single 
mating was all that was necessary to 
fertilize the eggs laid during a long 
period of time. Of the group of lone 
females 92 per cent laid eggs. Only 
73 per cent laid viable eggs. In order 
to determine whether the females were 
able to produce eggs without fertiliza¬ 
tion or whether a much larger per¬ 
centage of the females had been fer¬ 
tilized than was believed to have been 
the case, another series of females, 
each individual of which had emerged 
alone in a container, was carried on. 
(Table V.) 
Table IV summarizes the length of 
life of 100 lone females and the females 
from the 100 pairs discussed in con¬ 
nection with Table II, folloAving the 
same method as that of Table III. 
Table IV .—Longevity of 100 lone females and 100 mating females given water , 
honey, sugar water, and nothing 
! 
Food given 
Longevity of lone females 
Longevity of mating females 
Maximum 
Minimum 
Average 
Maximum 
Minimum 
Average 
Water... 
Honey...... 
Sugar water_ 
Nothing... 
Average... 
Days 
52 
65 
80 
50 
Days 
25 
8 
15 
18 
Days 
38.16 
41.4 
53. 56 
27.8 
Days 
51 
44 
54 
27 
Days 
11 
10 
a 3 
10 
Days 
27.24 
27. 36 
30.68 
17. 72 
40. 23 
25. 75 
Weevil got stuck in sugar water. 
