Wikipedia:
To mate
following courtship,
the male usually leaps onto the female’s back,
clasping her thorax and wing bases
with his forelegs.
He then arches his abdomen
to deposit and store sperm
in a special chamber near the tip of the female’s abdomen.
The female lays between 10 and 400 eggs,
depending on the species. Eggs are typically deposited in a froth mass-produced by glands
in the abdomen.
This froth hardens,
creating a protective capsule,
which together with the egg mass
is called an ootheca.