The head is extended from behind forwards, so that the crown (epicranium) is large, while the face (clypeus) is small.
The face (clypeus) is (Grooved Whirlibroad, extending on either side gig).
Below this comes the front, and then the face or clypeus, to which a very distinct upper lip (labrum) is usually jointed.
Ia, frons; b, clypeus (the pointed labrum beneath it); II, mandible; III, first maxilla; (a, base; b, sheath; c, piercer), III', inner view of sheath; IV, second maxillae forming rostrum (b, mentum; c, ligula).
The labrum and clypeus are developed as a single prolongation of the oral piece, not as a pair of appendages.
Of the head-capsule in the imago, it appears that the clypeus and FIG.
- A, Front of head of Sawfly (Pachynematus); a, labrum; b, clypeus; c, vertex; d, d, antennal cavities.
Along the straight edge there is usually a broad band, and at the neck is attached the "hood" (in Latin, the clypeus or shield), i.e.
I., a, frons; b, clypeus; I'., Same from behind.