3.3.5. The head of the drone
Proceed as with the worker. The hypopharyngeal glands are absent, and the postcerebrals are reduced to rudiments adhering to the posterior wall of the head. The mandibular glands are also vestigial. Clusters of fat cells in some parts of the head may be mistaken for glands. The brain proper (part of the protocerebrum under the ocelli) is smaller than the worker's, though the very large optic lobes give a misleading appearance of size.