. Fig. 10. Wing of N. quadrifasciata d- Female. Epistoma very slightly broader than in the male. Thorax yellow, in front of the scutellum a grey patch, which is sometimes somewhat indistinct, and generally with indications of three greyish stripes produced from the patch forwards. Postscutellum more or less grey. Plem-a yellow, very sligthly greyish pruinose, with a small, blackish spot as in the male. The four transverse bands on abdomen are more or less deeply incised in the middle of the hind margin, often so much as to be nearly divided into two spots. Legs simple. Length 3,5 to about 5,5
. Fig. 10. Wing of N. quadrifasciata d- Female. Epistoma very slightly broader than in the male. Thorax yellow, in front of the scutellum a grey patch, which is sometimes somewhat indistinct, and generally with indications of three greyish stripes produced from the patch forwards. Postscutellum more or less grey. Plem-a yellow, very sligthly greyish pruinose, with a small, blackish spot as in the male. The four transverse bands on abdomen are more or less deeply incised in the middle of the hind margin, often so much as to be nearly divided into two spots. Legs simple. Length 3,5 to about 5,5 mm; the male is longer than the female. N. quadrifasciata is somewhat common in Denmark; Copenhagen in a garden, Ordrup Mose, Ermelund, Dyrehaven, Geel Skov, Tisvilde, Sorø, and in Jutland at Sæby. My dates are ^^le—^^li. It may occur in high grass on meadows, and in herbage and on foliage on humid, shaded piaces, but especially on tree-trunks. Schiner says that only the female is common, the male rather rare, but I think he has not sought for it on trunks; I found both sexes in great number in Dyre- haven on 2'/6 and ^''/(j; they were present on almost every tree-trunk I examined, the males flying vertically along them; on the latter date many copulated pairs were taken. Geographical distribution: — Northern and middle Europe down into France; towards the north to middle Sweden. ± Fall. 1823. Fall. Dipt. Suec. Dol. 21, 29 {Dolichopus). — 1843. Zett. Dipt. Scand. II, 611, 97 {Dolichopus). - 1862. Schin. F. A. I, 183. — 1903. Kat. palaarkt. Dipt. II, 293. — Porphyrops ochraceus Meig. 1824. Syst. Beschr. IV, 58, 29. — Medeterus ochraceus 1838. Meig. ibid. VII, 155. Male. Vertex and frons grey; postvertical bristles yellow, some- times one or both black; the other bristles black. Epistoma narrow,
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishercopenhagengecgad
