240 Orthorrhapha brachycera. 



ally dowii the sides, with more or less distinct, yellow spots on the 

 sides of the second and sometimes also of the third segment. Front 

 coxæ quite or almost quite yellow; femora generally quite yellow, 

 only sometimes the hind femora brownish at the apex; hind tibiæ 

 likewise sometimes quite yellow. Femora mainly short-haired. Squamu- 

 lar fringe black or shining somewhat brownish. 



Length. Somewhat varying in size, the length 4,.5 to fully 8 mm; 

 the female smallest. 



A. leucocephala is a common species in Denmark; at Copenhagen, 

 Vester Fælled, Charlottenlund, Ordrup Mose, Dyrehaven, Lyngby Mose, 

 Fure Sø, Ørholm, Hillerød, Hellebæk, Faxe Ladeplads; on Falster at 

 Vejringe; on Funen at Odense and Veflinge; in Jutland at Snoghøj, 

 in Højenbæk Dal at Vejle, at Vestbirk near Skanderborg and Tinbæk 

 Mølle at Lindenborg Aa, fmally on Bornholm at Almindingen and 

 Hammeren. My dates are ^^'e— ^/y. It occurs in low herbage at 

 humid piaces, in fens and in woods at the horders of water, often 

 in great number; it is often seen in such piaces flying very rapidly 

 to and fro in sharp curves, quite low over the wet ground and resting 

 on it; it is especially the males, which are thus in activity, while the 

 females rest on foliage in the vicinity. 



Geographical distribution: — Europe down into Italy; towards 

 the north to middle Sweden, and in Finland. 



5. A. argyria Meig. 



1824. Meig. Syst. Beschr. IV, 46, 2, et 1830 VI, 362 (Porphijrops). — 1878. 

 Kow. Verhandl. zool. bot. Gesell. Wien, XXVIII, 448, 7. — 1903. Kat. palåarkt. 

 Dipt. II, 323. — Argyra argentata Macq. 1834. Suit. å Buff. I, 457,2.— 

 — 1838. Meig. Syst. Beschr. VII, 154,2. — 1862. Schin. F. A. I, 191. — 

 DoUchophus argmtatus 1843. Zett. Dipt. Scand. II, 590, 78, et 1852. XI, 

 4297, 78, et 1855. XII, 4636, 78. — Dolichopus argentellus Zett. 1843. 

 Dipt. Scand. II, 592,80. — Dolichopus diaphanus 1823. Fall. Dipt. Suec. 

 Dol. 16, 19 p.p. c?. 



Male. Vertex and frons silvery white ; eyes with brownish or pale 

 brownish hairs. Epistoma narrow, silvery grey or white. Palpi small, 

 black. Occiput grey pruinose; postocular bristles black above, whitish 

 below. Antennæ black, as long as or a little longer than the head, 

 third joint about as long as the two basal joints; arista longer than, 

 or at all events as long as the antennæ. Thorax metallic green, some- 

 what densely silvery pruinose, especially when seen from in front, 

 except just in front of the scutellum; acrostichal bristles long; scutellum 

 not hairy. Pleura greenish, grey or whitish grey pruinose; prothoracic 

 bristles fine, whitish. Abdomen with the ground colour appearing 

 dark grey or blackish, seen from behind with a slight greenish colour. 



