1979] Lest on Dispersal by Male Dory line Ants 69 
This confirmed what is suggested by inspection: rainfall and num¬ 
bers of male dorylines are neither directly nor inversely associated, 
nor can a lagged correlation be detected. 
However, there is a highly significant deviation from a random 
distribution pattern in the three components of Table 1 (extension 
of the median test (Siegel 1956): *2 = 16.15, DF = 3, p< 0.001). 
There is in fact an association of peak numbers, both in A. atriceps 
and overall ant frequencies (Fig. 3), with the period of the year—late 
April through early June (Fig. 1)—when both mean sunshine and 
mean rainfall are relatively high. This is obscured in the data of 
Table 1 by October 1969 and January and February 1970 being 
wetter than usual. 
Discussion 
Cyclic phenomena occur in all the New World dorylines studied 
(Schneirla, 1971, and works cited therein): brood production and a 
division of activity between well marked statary and nomadic 
phases are among the events in which regular periodicities are the 
Tab Ie 1 Bright sunshine, rainfall and numbers trapped of Alaopone atriceps, cor¬ 
rected for missing samples and grouped in monthly classes. 
Mean bright 
sunshine/ hrs 
per day 
Rainfall 
cms 
1969 
Oct 
7.9 
10.21 
Nov 
8.7 
1.12 
Dec 
8.9 
0.64 
1970 
Jan 
8.0 
7.54 
Feb 
8.1 
8.33 
Mar 
8.3 
3.76 
Apr 
6.5 
6.71 
May 
6.3 
25.78 
Jun 
6.3 
15.80 
Jul 
5.2 
2.49 
Aug 
4.9 
0.76 
Sep 
6.5 
3.76 
Oct 
7.7 
8.46 
A. atriceps 
trapped 
34 
29 
106 
38 
57 
178 
624 
707 
237 
124 
191 
104 
41 
