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Psyche 
[Vol. 87 
Figure 1. Proportion of eggs fertilized by green males subsequent to the final 
mating, g (green) and y (yellow) refer to the color types of males mating the females. 1 
(>3.67 d) and s (<3.67 d) are the durations of the first copulation for females mated 
twice. Point L on the abscissa refers to eggs laid prior to the last mating of the female. 
male fertilized at least 50% of the eggs laid subsequent to the second 
insemination (Fig. 1). When the duration of the second copulation 
was less than 3.67 d, the 2nd male gained precedence in the 
fertilization of later egg masses. These results were independent of 
the duration of the second copulation. 
When the female was mated 3 times the 1st male still predomi¬ 
nated in the fertilization of the 1st egg mass laid subsequent to the 
3rd insemination (Fig. 1). This pattern mimicked the sperm 
precedence pattern for females inseminated twice. However, when 
the 1st 2 males mating the female were of the same color type, the 
3rd male fertilized few of the eggs laid subsequent to the 3rd 
insemination. Thus, this pattern mimicked that where'the 1st copu¬ 
lation was of long duration when females were inseminated twice. 
The duration of copulation was longer for pairs isolated from jars 
with 4 males and 2 females than from jars with 4 females and 2 
males (Fig. 2). 
In the laboratory, females first mated with the largest male in jars 
with 4 males and 2 females in 43 of 68 instances in which male 
pronotal widths had been determined. This proportion (P = .63) was 
significantly greater than the P = .25 expected by chance alone (P < 
