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The following table is designed to show the number and succession of the segments of the head, with their respective segments.

Tabular View of the Segments, Pieces (Sclerites), and Appendages of the Head Name of Segment Pieces or Regions of the Head-capsule Appendages, etc. Preoral, in early embryo. 1. Ocellar (Protocerebral). Epicranium, anterior region with the clypeus labrum, and epipharynx. Compound and simple eyes (Ocelli). Postoral, in early embryo. 2. Antennal (Deutocerebral). Epicranium, including the antennal sockets. Antennæ. 3. Premandibular, or intercalary (Tritocerebral). Wanting in postembryonic life, except in Campodea. Premandibular appendages (in Campodea). 4. Mandibular. Epicranium behind the antennæ, genæ. Mandibles. 5. 1st Maxillary. Epicranium, hinder edge? Tentorium. 1st Maxillæ. 6. 2d Maxillary, or labial. Occiput. 2d Maxillæ or Labium. Post-gula, gula, submentum, mentum, hypopharynx (lingua, ligula), paraglossæ, spinneret.

Fig. 38.—Larva (a) of a chalcid, about to pupate, with the head, including the eyes and three ocelli, in the prothoracic segment: b, c, pupa.