1969] 
Willey and Willey — Social Displays 
281 
of other related species, except for sparse populations of Aeropedellus 
clavatus (Acridinae). At lower elevations, Xanthippus corallipes, 
another oedipodine, is commonly sympatric with A. conspersa. The 
densest populations so far observed occur in short grass prairie parks 
near Los Pinos Pass (10,200 feet, Saquache Co.), Black Mesa, 
and Table Mesa (6,200 feet, Boulder Co.). We have counted as 
many as 60 males per acre, but usually the population averages 
fewer than 20 per acre with more or less clumped distribution. 
These densities would seem to be relatively low for efficiency of loca- 
tion of mates and may be correlated with the highly evolved signals 
for social communication described below. 
Figure 1. Male A. conspersa in alert pose, Table Mesa, Boulder Co. 
This male also was buzzing with the right hind leg (visible as 2 faint 
diagonal streaks). 
MATERIALS AND METHODS 
Field observations entailed sitting or standing quietly in the center 
of a population cluster. The members of this species are unwary 
enough to behave normally within a few inches of the observer. 
Completion of behavioral sequences have been observed on our nets, 
clothing and boots. Notetaking and scoring an outline sheet did not 
disturb the grasshoppers. Climatic conditions were noted ; in a few 
