322 
Psyche 
[September-December 
months 
Figure 5. Graph of monthly average number of male Hexacentrus 
mundus stridulating on transects I, II, and III. Average for all transects 
marked A. 
The most important conclusion that we draw from our data is 
that they are a reliable indication of year-round activity by a mod- 
erately large carnivorous insect. We strongly suspect that katydids 
in temperate regions will prove to be markedly seasonal in singing 
activity, reflecting the fact that adults are not present throughout 
the year. It would further seem probable that in temperate regions 
the larger the insect the shorter the portion of the year “occupied” by 
adults and we would expect that large katydids would be more 
seasonally restricted (as adults) than smaller species. (This should 
be generally true of temperate region arthropods that do not possess 
a pupal stage or cannot otherwise spread their development over 
more than one year, assuming it takes longer to reach a larger adult 
size, and that the overall period of each year available for active 
life is more or less equally restricted for all arthropods living under 
