174 Orthorrhapha brachycera. 



white; the upper branch of the cubital vein originating with an acute 

 angle, diverging, and curved a little at the apex. The stigma is white, 

 very faint, scarcely observable; the apical part of the subcostal vein 

 is thickened. Halteres whitish. 



Female. Quite similar to the male. Front metatarsi simple, 

 half as long as tibiæ; hind tibiæ thin and simple. 



Length 2 — 2,4 mm. 



The pupa is yellowish white; besides the two teeth at the bases 

 of the antennal sheaths it has two triangular teeth below the head 

 inwards to the apices of the sheaths, each with a hair close to it. 

 The length is 2,5 mm. 



This species is at once recognised by the colour of the body and 

 the wings. 



H. niveipennis seems to be rare in Denmark, only six specimens 

 have been caught; Ordrup Mose (Jacobsen), Ermelund (J. P. Kryger), 

 and Ørholm (the author); my dates are ^-^/s — ^"/g; it is certainly a 

 somewhat early species. Strobl records it from low herbage at the 

 margin of brooks, and from flowers of Pyrus from the end of April 

 to the end of May. The pupa was taken in a mole-cast in Ermelund 

 on 2^/4, it developed on ^''/s. 



Geographical distribution : — Northern and middle Europe down 

 into Austria; towards the north to middle Sweden. 



20. H. litorea Fall. 



1815. Fall. Dipt. Suec. Empid. 24, 20 {Empis). — 1842. Zett. Dipt. 

 Scand. I, 351, 21, et 1849. VIII, 3017, 21. - 1862. Schin. F. A. 1, 113 

 et 114. -- 1892. Strobl, Verh. zool. bot. Geseil. Wien, XLII, 161, 46. — 1903. 

 Kat. palaarkt. Dipt. II, 252. — Hilara univittata: 1822. Meig. Syst. Beschr. 

 III, 8, 14. ^. 



Male. Vertex and frons grey, the latter rather narrow; epistoma 

 grey, very narrow; palpi yellowish or brownish, with dark hairs, 

 especially one long hair is present. Occiput grey, with black hairs, 

 below with paler hairs. Antennæ black. Thorax grey, almost ahvays 

 with a somewhat broad, brownish middle stripe. The dorsocentral 

 and acrosticlial bristles of some length, black; the former uniserial, 

 longer behind, the latter quadriserial. Further a humeral bristle, a 

 posthumeral, three notopleural, a supraalar and a postalar bristle, 

 all black; generally there are besides some weaker bristles or bristly 

 hairs. Pleura grey, the spiracles lighter or dai'ker brownish. Scutel- 

 lum with four black marginal bristles. Abdomen dark brown, a little 

 lighter at the base, clothed with brownish to blackish hairs, but on 

 the first segments the hairs are yellow; there are somewhat long 



