Courtship of certain European Acridiidx. 251 
under wings, but even in the open path, the male seemed 
to lose her at once. In another case, when the female 
came near, the male jumped right away.” 
It is noteworthy that most of the observations upon 
the last-named two species were made late in the after- 
noon, when the sun was losing its power. 
CHDIPODA C@RULESCENS. 
Thad long wished to study the courtship of these 
beautiful insects, but there were none round the Weiss- 
horn Hotel. Lower, at San Luc (5390 feet), they began 
to appear, and still lower, at Vissoye (4006 feet), and all 
along the main valley road, they were excessively abun- 
dant. They are always difficult to observe, because they 
haunt places where the combination of direct heat with 
that reflected from rocks or bare slopes, is almost un- 
bearable. I had no time to observe them until we had 
come down to Fribourg. 
SEPTEMBER 9.—T'hese insects were very abundant in a 
large gravel pit, just outside the gate of the town, on the 
road to La Roche. There is little doubt that they be- 
longed to the above-named species. They were very lively, 
continually flitting about over the bare earthand gravel. 
They are very shy, and it is necessary to keep perfectly 
still in the intolerable heat, in order to watch their habits. 
I noticed that the males move their third legs as if in 
stridulation, but that no audible sound was emitted. 
There is an apparent lack of intention and effort about 
their movement which suggested that the habit is pro- 
bably only a vestige, and possesses no other significance. 
The legs were raised, and seemed to be allowed to drop 
by their own weight. Furthermore, these strokes were 
not repeated at regular intervals, but quite irregularly, 
and often singly. In this case I did not secure any 
material, and therefore cannot speak with any confidence ; 
but I anticipate that the legs will be found to be without 
the sound-producing structures. 
A female remained motionless on the ground near to 
me. She was much larger than the males, and the ex- 
posed surface of her body and wings was of a redder 
brown. ‘The males were extremely acute in detecting 
her presence, although she made no movement, and 
looked exactly like a part of the ground. Whenever a 
