Displaying the glands and antennal lobes (Plates 9, 10)

1. Lift out the glands with the point of a needle.

2. Note:

   2.1. the form of the hypopharyngeals, like strings of onions;

   2.2. the quite different branched structure of the postcerebrals;

   2.3. the mandibular glands.

Beware of rupturing them and thus losing their contents.

3. Cut away the frons down to the level of the antennae.

4. Observe:

   4.1. the antennal lobes,

   4.2. nerves running into the antennae.

They can be seen if the head is lying in a favourable position, as in Plate 10.