Auditory organs of a simple type are present in most insects.

Auditory organs of a simple type are present in most insects.

Auditory bulla filled with honeycombed bony tissue.

At the fundus are placed the concrement-cells with their conspicuous otoliths (con) and the inconspicuous auditory cells, which are connected with the subumbral nerve - ring.

In connexion with the large size of the ears is the excessive inflation of the auditory bulla of the skull.