Dolichopodidae. 45 



darkened. The anterior metatarsi about of the length of the four 

 following joints, the hhid metatarsi shorter than the second joint. The 

 front coxæ yellow-haired, with some bristles, and the middle coxæ 

 with some black bristles anteriorly; hind coxæ with a black bristle 

 on the outer side; for the rest the legs have short, blackish hairs, 

 the anterior femora bare beneath; the front tibiæ with a bristle in 

 the middle on the dorsal side, the posterior tibiæ with bristles on the 

 various sides, and with apical bristles, and the posterior metatarsi 

 with some bristles, on the hind metatarsi only below. Wings narrow 

 at the base, no axillary lobe present; they are yellowish, brownish 

 at the anterior margin; veins brown or blackish brown; the discai 

 vein almost without any bend, nearly parallel with the cubital vein ; 

 the posterior cross-vein lying nearer towards the apex than in quadri- 

 fasciata; the anal vein long, almost reaching the middle of the wing. 

 Squamulæ pale yellow, with a yellow fringe. Halteres yellow. 



Female. Epistoma a little broader than in the male, and more 

 grey. Thorax grey as in the male. Anterior tarsi slightly darkened 

 towards the end. Wings not narrow at the base, the axillary lobe 

 moderately developed; the anal vein shorter. 



Length 3,5 — 5 mm. 



This species is easily known from qtiadrifasciata, in the male by 

 the legs and the narrow wings, and in the female by the grey thorax; 

 in both sexes the infuscation of the anterior margin of the wings, and 

 the direction of the discai vein are good characters. 



N. suturalis is somewhat rare in Denmark ; Lersøen, Ordrup Mose 

 (Stæger), Charlottenlund (the author), Hillerød (Godskesen) ; on Funen 

 at Odense, and in Jutland at Frederikshavn (H. J. Hansen). The dates 

 ^^/e to the last part of July. It may occur on meadows in low her- 

 bage, but is generally, especially the males, found on tree-trunks ; I have 

 taken it on ^Ve in Charlottenlund, where it was present in great 

 number, the males were sitting on tree-trunks and flying vertically 

 along them, from below upwards, evidently seeking for prey; also 

 females were found on the trunks. 



Geographical distribution: — Europe down into Italy; towards 

 the north to southern Sweden. 



4. N. abdominalis Fall. 



1823. Fall. Dlpt. Suec. Dol. 21, 30 (DoUchopus). — 1843. Zett. Dipt. 

 Scand. II, 612, 98 (DoUchopus). — 1869. Loew, Beschr. eur. Dipt. I, 303 

 {Saucropus). — 1903. Kat. palåarkt. Dipt. II, 292. 



Male. Vertex and frons grey, the bristles black, the postvertical 

 bristles yellow. Epistoma very narrow, light grey. Palpi yellowish. 



