These appendages are a pair of antennas and three pairs (man- dibles, maxillae, and labium) concerned in the preparation of bn food for the mouth.

In the simpler types of insects (as the Fig 125.

Head of grass- grasshopper) these mouth-parts acquire their typical develop- f Eye! ment 5 in others ( as the % and butterfly) they become greatly n.

LabiTpaipus.

OJem.