What is not present in a female cockroach?

In a cockroach, the walking legs help in which of the following?

In $Cockroach$,wings are absent from:

In the female cockroach,which segment is boat-shaped?

Segments in the head of a cockroach - $P$
Segments in the thorax of a cockroach - $Q$
Segments in the abdomen of a cockroach - $R$
Select the correct option for $P, Q, R$.

Which of the following characteristics is $NOT$ found in the cockroach $(Periplaneta \text{ } americana)$?