1980] 
McLain — Nezara viridula 
331 
pheromone emission. Upon initiation of mating, the viability of the 
mating male and the 3 un-mated males was recorded for the 4 d 
following. A period of 4 days was chosen as suitable for analysis 
since 75% of the matings are less than 4 d in duration and because 
analyses based on longer periods of time may not reflect the viability 
of the males at the time of mating. A significantly greater 
proportion of males with pronotal widths less than 6.75 mm died 
during the 4 d (Table 1). 
The number of parasitoid eggs on field-caught mating males 
averaged 2.73 (n = 77; s.d. = 2.40), while the number on males not 
mating averaged 2.12 (n = 59; s.d. = 1.29). The difference between 
these averages is marginally significant (.05 < P< .10; t-test) in spite 
of the small sample sizes. More intensive sampling might have 
yielded significant differences indicating that those males which are 
most attractive to females are also most attractive to the ovipositing 
parasitoid. A strong relationship existed between male size and the 
level of parasitoidizaiton (Fig. 4). Thus, both the parasitoid and 
female N. viridula were more frequently attracted to larger males. 
non-mating males (P<.05, t—2.5; t-test). 
