Immature Stages of Pyrgotidae
The egg Adapsilia flaviseta Aldrich of the Pyrgotidae (Fig. 187A) measures 1.3 mm. in length and 0.25 mm.in width, with the posterior third drawn out to a narrow point. It is distinctly curved, and the smoothly rounded anterior end bears a button‑shaped micropyle. The first‑instar larva is distinctly segmented, widest in the mid‑abdominal region, with the caudal segments much narrowed, the mouthparts much reduced, and the single pair of spiracles of simple form. The second‑instar larva is more robust and bears numerous papillae in a transverse band on each segment. The anterior spiracles are simple and very small, whereas the posterior pair (Fig. 187B) have two openings, one above the other, and are surmounted by a heavy, dorsally directed hook or spine. In the 3rd instar larva, the anterior spiracles (Fig. 187D) are stalked and fan‑shaped, with many openings, whereas the posterior pair (Fig. 187E), situated at the dorsal rim of a large median depression, are very large and consist of three main lobes, with a dorsally directed hook or spine at the inner dorsal margin. They are markedly convex, the ventral lobe curved beneath the rim of the depression. The puparium (Fig. 187F) is keel‑shaped and brown to reddish‑brown in color, with the anterior spiracles stalked. The median posterior cavity of the larva and puparium is common to a number of species, though Davis stated that it is lacking in P. valida Harr.
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