138 Orthorrhapha brachycera. 



with brown or blackisli brown spots, chiefly forming three more or 

 less dissolved and towards the hind margin narrowed, transverse 

 bands and generally two paler spots near the apex: veins blackish 

 l)ro\vn. Halteres dark gréyish brown with a paler peduncle. 



Female. Eve? brown, faintly iridescent. Abdonien grey. the 

 segments with black, laterally tapering and pointed, transverse bands 

 at the front margins, not reaching the side margins; the bands largest 

 on the front part of the abdomen being smaller backwards, the last 

 segments grey; the hind margins of all segments narrowly pale. 

 Venter grey with broad, yellowish hind margins of the segments. 



Length 8,5 — 10 mm. 



A. ibis is very rare in Denmark, only nine specimens have been 

 taken in all, and it has only been taken in the southern and middle 

 Jiitland; Holsted (Carl Moller), at Vejle (A.Petersen) and in Greisdalen 

 near Vejle (Schlick), al Funder near Silkeborg (A. Petersen) and at 

 Randers (Holstebro); the dates of captnre are -Ve, — ^/-. 



Geographical distribution: — The species is wideiy distributed 

 through Europe. in Siberia and in Japan; in the northern Europe it 

 is very rare, iiiit it goes far north, a specimen having been taken in 

 Lapland. 



2. A. marginata Fabr. 



1781. Bibio. Fabr. Spec. Ins. II. 413. 6. — 1842. Zett. Dipt. Scand. 1. 

 225, 2. — 1862. Schin. F. A. I, 178. — 1903. Kat. paiåaikt. Dipt. II, 77. 



Male. Front black, witli long. black hairs, face grey, with loiig, 

 brownish grey or whitish hairs Antennæ brownish black. Thorax 

 and scutellum black, shining, clothed with somewhat longish, brownish 

 black hairs; pleura and sterna light grey, a tuft of liairs on the 

 mesopleura in front of the wing-root. Abdomen dull l)lack with the 

 hind margins of the segments whitish grey; when seen with the light 

 falling in from behind, the first two segments are almost quite grey 

 except in the middle; the last two segments are entirely black. Venter 

 grey. Abdomen clothed with pale, yellowish grey hairs, but with 

 black hairs along the middle of the dorsal side. Legs brownish black 

 or brown; antcrior femora on the under side with longish, pale or 

 brownish hairs, the hind femora with shorter. pale hairs both above 

 and below; the hind tibiæ with a fringe of short, brown hairs on the 

 outer side. Wings hyaline with brownish fumigation, chiefly forming 

 three transverse bands, one occupying the Ijase, the second lying out- 

 wards to the middle and the third occupying the apical part, the last 

 is not so dark as the others; the bands are separated by somewhat 

 narrow, hyaline parts, the inmost of these forming a hyaline spot at 



