frequency 
1979] Leston — Dispersal by Male Dory line Ants 67 
Besides the major annual period of abundance the species showed 
rhythmic pulsations in frequency. In April through June the 
periodicity was around 29 to 32 days, in December through Febru¬ 
ary around a day or two less. The periodicities were clear cut in 
Alaopone atriceps and Typhlopone fulvus (Fig. 6), less obvious— 
because of the lower numbers taken—in Dorylus sp 15 and Rhog- 
mus fimbriatus. 
The trapped material was assessed in terms of the i lh species (Fig. 
7). The first ten were amassed rapidly and were present by day 56, in 
the third sampling period (Fig. 4). However, the eleventh species 
Fig. 4. Totals of the four most abundant species in the Legon samples, logarith¬ 
mic, grouped in 20-day classes. 
