308 Orthorrhapha brachycera. 



Amager, Hellerup, Ordrup Mose, Tyvekrog; on Funen at Strib; my 

 dates are ^Ir, — ^^is. It occurs on fields and commons in low herbage. 



Geographical distribution : — Northern and middle Europe down 

 into France; towards the north to northern Scandinavia, and in Fin- 

 land; besides the species goes still farther towards the south, down 

 into North Africa. 



Remarks: Zetterstedt says: „Individua (J* $), quæ e Dania sub 

 hoc nomine a D. Stæger obtinui, majore jure ad speciem sequentem 

 lalbicor7iis'] referenda mihi videntur". How this may be I cannot say, 

 the specimens in our collection, labelled fiavicornis and originating 

 from Stæger, are certainly the present species. 



18. T. albicornis Zett. 



1842. Zett. Dipt. Scand. I, 279, •.). — 1903. Kat.palaarkt.Dipt.il, 279. 



Male. Frons and vertex white or greyish white; epistoma yel- 

 lowish white; palpi large, white and white haired. Occiput greyish 

 white, with white bristles above, white hairs below, the latter are 

 specially long, longer than usual. Antennæ white, the arista more 

 or less darkened towards the apex; the third joint very short, not 

 much longer than the basal joints, and only half as long as the arista. 

 Thorax light grey pruinose; there are two distinct notopleural bristles; 

 all bristles white. Scutellum with two white marginal bristlcs and 

 on each side a small hair. Pleura white or greyish white pruinose, 

 with a very small, black, polished spot above the middle coxæ. Ab- 

 domen black, shining, with grey bands at the sides, the bands gener- 

 ally somewhat large, sometimes smaller and only distinct in front: 

 abdomen is clothed with short, whitish hairs. Venter black, or often 

 more or less pale, especially at the base. Legs pale yellow to whitish, 

 tarsi dark at the apex, and sometimes more or less brownish annul- 

 ated, especially the anterior tarsi. The anterior femora a little thick- 

 ened and of equal thickness. The legs are pale yellow or whitish 

 haired. Wings hyaline. Veins pale yellow, the cubital and discai 

 vein about parallel. Halteres white. 



Female. Quite similar to the male, except the pointed abdomen. 



Length 2 — 2,5 mm. 



This little species is nearly related to fiavicornis, but it is 

 distinguished by the colour which both on head, thorax and legs is 

 much wliiter, the tarsi are only indistinctly annulated, and the cubital 

 and discai vein more parallel ; besides the species is smaller. 



T. albicornis is rare in Denmark ; V^ esterfælled (Stæger) and on 

 Funen at Odense (H. J. Hansen); the dates are in June and July. It 

 seems to occur on fields. 



