1983] 
Betz — Biology of Trichadenotecnum 
109 
Table 2. (continued) 
% of Total 
Position of a female 
K. Position of the forewing tips 
1. 
On the bark substrate 84.8 
2. 
In the air 
15.2 
N=92 
100.0 
L. Angle formed by the antennae 
1. 
0°-30° 
25.0 
2. 
o 
O' 
o 
0 
51.7 
3. 
61°-90° 
18.3 
4. 
9I°-120° 
5.0 
N=60 
100.0 
M. Angle formed by the antennae and 
the bark substrate 
1. 
0°-30° 
88.3 
2. 
O 
k 
o 
11.7 
N=60 
100.0 
General Features 
N. Relative positions of a male 
and female 
1. 
2. 
Both in-line 
Female skewed 
55.3 
right or left 
44.7 
N=47 
100.0 
O. Duration of copulation 
X 
14.3 minutes 
s.d. 
2.2 
range 
8.3-19.9 minutes 
N 
99 
^Recorded for both legs. 
In contrast to the position of a male’s antennae, a female’s anten- 
nae were swept back along her body when she assumed the receptive 
posture. Usually the antennae were held close to her sides, and the 
angle formed by the antennae was between 31° -60° (Table 2, L). 
Most (88.3%) antennal pairs were slightly raised from the substrate 
(Table 2, M). 
Copulation did not always proceed uneventfully. The number of 
positions among the pairs reflects the incidence of minor problems 
that were encountered during mating. The conformations occurring 
