1977] 
Randall — Green Lynx Spider 
291 
I stage. Unlike P. viridans the opening of the egg sac by adult 
female Trochosa is not triggered by a stimulus from the egg sac 
or the spiderlings in it. Engelhardt considers the opening of Tro- 
chosa egg sacs to be regulated by endogenous neurosecretory func- 
tion, related to oviposition and influenced by temperature in the 
same manner as the development of the eggs and spiderlings in the 
egg sac. 
Acknowledgements 
I sincerely thank Dr. Willard Whitcomb for his generous guid- 
ance during this investigation. I also thank Dr. Jonathan Reiskind 
for his interest in my work and for reading and discussing the 
manuscript for this report. 
References 
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