i6o 
Psyche 
[September 
Fig. 5. Female Lycosa rahida being tested after the male’s dismount. 
She has responded to tactile stimulation of the left posterior region of her 
carapace by swiveling her abdomen so as to raise the left side dorsad. 
(Note that the medial dark band on her abdomen is in line with the right 
dark band on her carapace.) 
inal swiveling in a few females that had initiated catalepsis prior to 
the male’s mount in apparent response to the male’s courtship dis- 
play alone. In all of these cases, tactile stimulation of various regions 
of the female’s cephalothorax and abdomen with an artist brush or 
a probe revealed that maximal abdominal swiveling was elicited by 
touching the posterior quarter of the carapace. (Tactile stimulation 
of the more anterior portions of the carapace or of the anterior lat- 
eral sides of the abdomen yielded weaker swiveling responses.) Touch- 
ing the right side of the posterior carapace resulted in a single ab- 
dominal movement which brought the right epigynal pore to a more 
dorsad position; touching the left posterior carapace elicited the cor- 
responding abdominal swiveling (Fig. 5). I could go from side to 
side with the probe in this manner and elicit appropriate abdominal 
movements in relatively rapid succession. If both sides of the fe- 
male’s carapace were pressed simultaneously, her abdomen was held 
medially and swiveled very slightly from side to side in alternation. 
Copulations in most experimental categories were similar in dura- 
tion to those observed in normal pairs (average duration for the lat- 
