Diptera danica : genera and species of flies hitherto found in Denmark . al discal cell, but this is formed belowin its whole length by the upper branch of the postical vein; thediscal cell is long; the first basal cell longer than the second; theanal cell is closed at a considerable distance from the margin. Aluladeveloped; alar squamula slightly fringed at the margin, no thoracicsquamula, but frenulum distinct. In rest the wings lie parallel overthe abdomen, one quite covering the other, and they are also inclinedsomewhat downwards on the sides, the fly thereby having a curiousappearance. I
Diptera danica : genera and species of flies hitherto found in Denmark . al discal cell, but this is formed belowin its whole length by the upper branch of the postical vein; thediscal cell is long; the first basal cell longer than the second; theanal cell is closed at a considerable distance from the margin. Aluladeveloped; alar squamula slightly fringed at the margin, no thoracicsquamula, but frenulum distinct. In rest the wings lie parallel overthe abdomen, one quite covering the other, and they are also inclinedsomewhat downwards on the sides, the fly thereby having a curiousappearance. I have not examined the developmental stages, but they havebeen described several times. Bouche (Naturgesch. d. Ins. 1834, 46,Tab. IV, Fig. 21— 25) describes larvae and pupae of fenestrate (senilis) \the larvae were found in Polypori on Salix and other trees. LeonDufour described the pupa of fenestralis (Anal. d. la Soc. Ent. de , 8, 1849, 493, PI. 16, fig. IV). Frauenfeld (Verb. k. k. zool. Wien, XIV, 1864, 65) bred fenestralis from larvae found in a. Fig. 48. Wing of S. fenestralis. 158 Orthorrhapha brachycera. mattress among horse-hair. He mentions (p. 68) three larva? of whichLow had spoken (ibid. XI, 1861, 395) and which were found in thenest of a swallow and were by Low recorded as Thereva larvae, butwhich Frauenfeld, probably correctly, thinks are larvae of niger was bred by Damianitch (Verh. k. k. zool. bot. Gesell. , 1865, 237) from a pupa found in an elm-tree in a cocoon ofSaturnia pyri which contained the remains of the Saturnia mentions (Berl. Ent. Zeitschr. 1867, 78) the same speciesbred from decaying wood. Packard (Proc. Essex Inst. 1867, 93) men-tions and figures a Scenopinus larva about which it is stated, that itwas feeding on carpets. Perris (Ins. du pin marit. Ann. de la de France, 1870, 226) found larvae and pupae of S. fenestralisin a branch of Crataegus which contained larvae of Ptinus germanus,
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