216 
Psyche 
[September-December 
insect taxon cannot be explained by a simple wet season/dry season 
cycle: the biological periodicities — the true seasons — are those 
which follow from periodicities in rainfall and sunshine taken to- 
gether (Gibbs & Leston, 1970). 
It is likely that the majority of the paussid species trapped at 
Legon came from the forest zone but nothing is known as to their 
host ants in West Africa. In view of their absence from the wide 
range of colonies of dominant, arboreal, ants sampled in Ghana 
(Leston, 1973b) it is probable their hosts are for the most part 
ground-nesting species. 
Acknowledgements 
My research has been supported by the Ghana Cocoa Growers’ 
Research Association, the Cocoa, Chocolate and Confectionery 
Alliance (U.K.), the University of Ghana and the Research Foun- 
dation of the University of Connecticut. 
Conclusions 
1. Six paussid species were taken in an ultraviolet light-trap run 
for 400 days at Legon, Ghana, the catch totalling 1063. 
2. The frequencies of the trapped species had a lognormal dis- 
tribution. 
3. The frequencies showed parallel periodic changes between the 
species. 
4. Peak emissions occur in the 1st wet sunny period, lesser max- 
ima in the 2nd wet sunny and the dry sunny periods of the Gibbs- 
Leston model. 
5. The ultimate factor, it is suggested, is prey availability to the 
host ants. 
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