The brain

1. Remove the hypopharyngeal glands to expose the brain.

2. Identify the structures flagged in the plate 13.

3. Cut down the compound eyes to the level of the optic lobes, and note the indications of the radiating ommatidia.

4. Remove the roof of the cibarium.

5. Examine the floor of the mouth cavity, finding:

   5.1. the hypopharynx, with the two pores marking the ends of

   5.2. the ducts of the brood-food glands.