238 Professor Edward B. Poulton on the 
cess, the male being apparently firmly seated on her 
back. 
Avcust 31.—A pair were found in copula in the Alpe 
garden close to the Weisshorn Hotel. The female was 
seen to eat freely, and once to void excreta, while the 
male was actively moving his third legs. This observa- 
tion was confirmed by F. Jenkinson. ‘These remarkable 
alternate movements of the male’s third legs during 
coitus were also seen by F. Jenkinson and me in a very 
large number of cases at other times. In a single case 
observed by F. Jenkinson on August 31, the male’s legs 
were at one time rapidly vibrated laterally, being moved 
simultaneously and not alternately, as in the usual move- 
ment. This perhaps corresponds to the shivering move- 
ment seen by me in the female on August 30th. 
SepremBer 1.—This latter observation was confirmed 
by me in the Alpine garden. In this case the beginning 
of the act was seen. The male appeared to be much 
excited, and the shivering movement occurred from time 
to time, just before and after the beginning of the act. 
The female, which possessed only one leg of the third 
pair, was quite motionless throughout. At the com- 
mencement of the act she expelled feeces, which were 
moist and quite different from the dry ejecta seen on 
other occasions. In this and the complete passivity of 
the female there is probable evidence that she was much 
influenced by the act. This passive appearance was 
entirely distinct from the indifference manifested in so 
many of the cases previously observed, in which, how- 
ever, the act had either not begun, or was probably far 
advanced. Shortly after coitus the pair remained motion- 
less for a considerable time. 
SEPTEMBER 2.—Up to this date the events immediately 
preceding pairing, and the pairing itself had been observed 
with care, but there was no evidence to show how the 
male became seated on the back of the female. I was 
very anxious to find out how this occurred, and whether 
there was any preliminary courtship by stridulation or 
otherwise, although the species had never been heard to 
stridulate. At this date, F. Jenkinson observed, and I 
was able to confirm, that the males leap upon the females 
when they come within a distance of about three inches, 
but apparently do not notice them at a much greater 
distance. Their attention appears to be directed to the 
