Courtship of certain Huropean Acridiide. 245 
order in which the male went through the various phases 
of courtship. Itis probable that the order varied greatly, 
and that some of the phases were often omitted. 
SerremMBer 2.—On this and many other occasions the 
males were often seen to leave the female they were 
pursuing and, apparently without knowing it, to follow 
some other female they accidentally came upon in the 
course of the pursuit. A male pursuing a female was 
once seen to approach and jump at the male of Pezo- 
tettiv, having apparently mistaken it for the female. 
SEPTEMBER 3.—On the grassy slopes below the Bella 
Tola, a male observed by F. Jenkinson and me was 
greatly excited by the pair of Pezotettix already described 
as attempting, but unable to copulate. He stood in the 
characteristic attitude, walked round them, and finally 
stood in front and stridulated for the usual length of 
time and with the usual ending, he then advanced as if 
to jump, but before doing so became satisfied that he had 
made a mistake, and walked away. It was evident that 
he had mistaken the pair for the female of his own species. 
Just below the zigzags up the Bella lola we saw a 
male which, standing by a female, repeated the stridula- 
tion four times with the usual conclusion on each occasion, 
and then after all this attention let her walk away unper- 
ceived. This and the other facts already described seem 
to show that the males were very unobservant. In this 
respect their behaviour was very different from that of 
Pezotettiz, and from the very alert member of their own 
species observed on August 30. 
No hight was thrown upon the function of the remark- 
able dilated tibiz of the first legs of the male. ‘he 
whole tibia, swollen into the shape of a pear, with the 
tarsus articulated to its broader end, presented a most 
curious appearance in the characteristic attitudes assumed 
during courtship. On the underside of this dilated mass, 
which js approximately circular in transverse section, two 
rows of hairs are seen. Although the hairs are smaller, 
and the rows more widely separated, both evidently cor- 
respond to those which are found beneath the unmodified 
tibize of the other legs. 
Although we observed the habits of this species on 
many other occasions, neither F'. Jenkinson nor I had 
ever seen the pairing accomplished. I therefore asked 
Mr. F. V. Dickins if he would consent to watch through 
