. Fig. 48. Wing of S. fenestralis. branched and thus two cubital cells; the discal vein not branched, the apical part curved up towards the end of the cubital vein, thus the first posterior cell narrowed at the margin; as the discal vein is not branched there is no ]'eal discal cell, but this is formed below in its whole length by the upper branch of the postical vein; the discal cell is long; the first basal cell longer than the second: the anal cell is closed at a considerable distance from the margin. Alula developed; alar squamula slightly fringed at the margin, no thoracic squamula, but f
. Fig. 48. Wing of S. fenestralis. branched and thus two cubital cells; the discal vein not branched, the apical part curved up towards the end of the cubital vein, thus the first posterior cell narrowed at the margin; as the discal vein is not branched there is no ]'eal discal cell, but this is formed below in its whole length by the upper branch of the postical vein; the discal cell is long; the first basal cell longer than the second: the anal cell is closed at a considerable distance from the margin. Alula developed; alar squamula slightly fringed at the margin, no thoracic squamula, but frenulum distinct. In rest the wings lie parallel over the abdomen, one quite covering the other, and they are also inclined somewhat downwards on the sides, the fly thereby having a curious appearance. I have not examined the developmental stages, but they have been described several times. Bouche (Naturgesch. d. Ins. 1834, 46, Tab. IV, Fig. 21—25) describes larvae and pupoe of fenestralis {senilis); the larvae were found in Polypori on Salix and other trees. Leon Dufour described the pupa of fenestralis (Anal. d. la Soc. Ent. de Fr. 11, 8, 1849, 493, PI. 16, fig. IV). Frauenfeld (Verb. k. k. zool. bot. Gesell. Wien, XIV, 1864, 65) bred fenestralis from larvae found in a
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Keywords: ., bookauthorlu, bookcentury1900, bookdecade1900, booksubjectdiptera
