18.104.22.168. The glands
1. Cut through the wall of the mask with the point of the knife, across the vertex, round the margins of the compound eyes, and round the edges of the mask, excluding the mandibles, labrum, and clypeus.
2. Snip off the antennae near to their insertion.
3. Lift off the mask which remains connected by tentoria.
4. Cut around the small pits in the suture surrounding the clypeus.
The mask will then lift off.
5. Hold the clypeus down firmly by the cibarial muscles (dilators of the cibarium).
6. Disengage the cibarial muscles by using the point of the knife in the same way as when taking the roof off the thorax.
7.1. the hypopharyngeal glands. In a young bee, five or six days old, or in a winter bee which has not yet nursed brood, they will have the appearance shown in the Plate, the acini being plump and creamy white; they will almost fill the space in front of the brain, as well as sending branches to the back of the brain. They can be lifted out to show their string-of-onions structure. In foraging bees which have completed their nursing duties, these glands are greatly shrunken, almost to the point of disappearance, leaving only thin thread-like remains;
7.2. the mandibular glands, beware of rupturing them and thus losing their contents.