Antennae = formed of scape, pedicel and flagellum
Chaetosema = a group of sensory hairs near the ocellus
Collar (crown) = scales at the rear part of the head
Compound eye = these may be ‘clean’ or have a scattering of hairs or lashes
Crown = collar
Flagellum = third part of the antennae and may be simple or be clothed in hair-like scales
Frons = front part of the head (face)
Haustellum (proboscis) = ‘tongue’, may be short, long, naked or clothed with scales
Labial palps = organs arising from just below the compound eye, usually with three segments and clothed with scales. Together with the maxillary palps, their layout and build can give clues to family identification
Maxillary palps = organs arising from just in front of the labial palps, sometimes conspicuous, sometimes apparently absent, usually clothed with scales and sometimes folded in the more primitive families, partially obscuring the eye. Together with the labial palps, their layout and build can give clues to family identification
Ocellus = a simple eye, sensitive to light levels.
Pedicel = second part of the antennae, between the scape and flagellum
Proboscis = haustellum
Scape = first part of the antennae, which may be simple, have a row of bristles forming a pecten, or be expanded to form an eyecap
Vertex = area between antennae and collar