1975] 
Waldorf — Sinella coeca 
363 
HOURS IN NONREPRODUCTIVE INSTAR (x -x) 
z 
1 
10 
c c 
LU 
CL 
CO 
(- 
D 
o 
in 
LL 
o 
O 
z 
z 
< 
LU 
2 
e»6 et18 midpt. e-18 e-6 e 
HOURS IN REPRODUCTIVE INSTAR (• • ) 
Figure 2. Average number of bouts of grooming behavior in 5 min 
through the reproductive and nonreproductive instars. Ages are given in 
hours relative to ecdyses (e) at the onset and conclusion of the instars. 
Lepidocyrtus cyaneus Tullberg cleans its antennae twice in five 
minutes and its legs an average of 1.3 times (Pedigo, 1967). These 
compare with 1.8 times for antennae and a smaller value for leg 
grooming in male Sinella coeca. These rates are remarkably similar, 
perhaps indicating equal rates of locomotor activity in the two 
species. However, if Lepidocyrtus males are more active than 
females, those frequencies might be averages of the higher rate of 
grooming in males with the lower one in females. 
The location in instars of the maximum grooming rate is of 
interest. In S. curviseta females pick-up and utilize sperm only 
during about the first 20 hours of the reproductive instars (Waldorf, 
1971). During this interval females release a volatile sex pheromone 
that increases male spermatophore deposition (Waldorf, 1974a). 
Further Joosse (1975) reports that certain events synchronize molt- 
ing in natural populations of species of Entomobryidae. Conse- 
quently, if Sinella coeca females are similar to S. curviseta ones, the 
maximum spontaneous grooming in males might often coincide with 
the presence of the female sex pheromone. 
