Archive image from page 86 of Diptera Danica genera and species Diptera Danica: genera and species of flies hitherto found in Denmark dipteradanicage01lund Year: 1907 Xylophagidae. 77 in a slender ovipositor with a pair of small lamellae at the apex. Wings with the cubital vein forked; between the discal cell and the postical vein is a postical cross-vein: there are five posterior cells, all open. The larva is elongate, cylindrical, whitish yellow: the body con- sists of twelve segments, including the head: at the anterior margin of each of the abdominal segments, except the last, there is,
Archive image from page 86 of Diptera Danica genera and species Diptera Danica: genera and species of flies hitherto found in Denmark dipteradanicage01lund Year: 1907 Xylophagidae. 77 in a slender ovipositor with a pair of small lamellae at the apex. Wings with the cubital vein forked; between the discal cell and the postical vein is a postical cross-vein: there are five posterior cells, all open. The larva is elongate, cylindrical, whitish yellow: the body con- sists of twelve segments, including the head: at the anterior margin of each of the abdominal segments, except the last, there is, on the ventral and dorsal surface, a transverse swelling set with small spines in two rows; the swelling on the dorsal side of the penultimate segment is rudimentary. The segments bear some bristles on the sides. The head is long, conical, pointed, brownish black chitinised. Fig. 28. Wing of X ater. The mouth parts are small, consisting of liookformed, not thooted. mandibles, and more scaleformed maxillae with small palpi. The thoracic segments are, on the dorsal surface, reddish brown, strongly chitinised, on the third segment sometimes the chitinising forms only lateral plates. The last segment is rounded, somewhat bulbous, it bears the anus on the ventral side as a longitudinal split between a pair of swollen lips; the lips are surrounded by a circular groove with small spines, from each side of which a similar, v-siiaped groove stretches out. On the dorsal surface of the segment there is. at the apex, a somewhat triangular, chitinised plate, ending in two dorsally curved spines, and in front of this plate there are two pairs of small plates. The larva is amphipneustic with a large prothoracic spiracle on each side of prothorax. and a pair of spiracles at the apex, in the terminal plate mentioned. The length of the larva is about 20 mm. The pupa is free; it is generally somewhat curved; the antennal sheaths are lying backwards to each side, and in front, between them, the
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