The Descent of Man

Cape of Good Hope these insects make a wonderful
noise during the night.
In the three foregoing families, the females are
almost always destitute of an efficient musical
apparatus. But there are a few exceptions to
this rule, for Dr. Gruber has shewn that both
sexes of Ephippiger vitium are thus provided;
though the organs differ in the male and female
to a certain extent. Hence we cannot suppose
that they have been transferred from the male
to the female, as appears to have been the case
with the secondary sexual characters of many
other animals. They must have been independently
developed in the two sexes, which no
doubt mutually call to each other during the
season of love. In most other Locustidae (but
not according to Landois in Decticus) the females
have rudiments of the stridulatory organs
proper to the male; from whom it is probable
that these have been transferred. Landois also
found such rudiments on the under surface of