294 Oithorrhapha l)i'achycera. 



Geographical distribution : — The species is hitherto only known 

 from Denmark, but this is probably because it has not been recog- 

 nised, or perhaps not considered as a separate species. 



Remarks: The species is very nearly related to flavipes and 

 fulvipes, and I am not quite sure, that it is a distinct species; it 

 might then perhaps be a form of fulvipes with quite yellow legs and 

 coxæ. I have examined Zetterstedt's type-specimens, the thoracic 

 disc is in these somewhat rubbed, as also suggested by Zetterstedt. 

 Frey (Zeitschr. fiir syst. Uymenopt. and Dipt. 1907, 410) piaces the 

 species in the group with black thoracic bristles, but this is erroneous, 

 as all the bristles are yellow; probably then Frey has had another 

 species. 



4. T. cothurnata Macq. 



1827. Macq. Soc. Se. Lille, 1827, 100, 17 {Platypalpus) . — 1838. 

 Meig. Syst. Beschr. VII, 98, 54. — 1842. Zett. Dipt. Scand. I, 283, 13. — 

 1862. Schin. F. A. I, 88 {PlaUjpalpus). — 1903. Kat. palåarkt. Dipt. Il, 282. 



Male. Frons and vertex grey; epistoma white; palpi small, 

 white haired. Occiput grey, with yellow bristles above, white hairs 

 below. Antennæ black, third joint short, shorter than the arista. 

 Thorax greyish yellow, or sometimes more light grey, and not very 

 densely pruinose; all bristles yellow. Scutellum with two yellow 

 marginal bristles and a small hair on each side. Pleura grey or light 

 grey pruinose; above the middle coxæ a black, polished spot. Ab- 

 domen black, shining; indistinct grey bands may be present at the 

 sides on the first segments; it is clothed with short, pale yellowish 

 hairs, which are longer at the sides. Venter black. Legs paler or 

 darker yellow, also the coxæ; generally the tarsi have the last two 

 or three joints blackish, but sometimes the whole tarsus is blackish 

 or brownish annulated. The front femora slightly, the middle femora 

 a little more thickened, but both pairs not much thickened. The legs 

 are yellow haired, front and hind tibiæ with a few small bristles on 

 the dorsal side. Wings a little yellowish. Veins brownish, paler at 

 the base. Halteres yellowish white. 



Female. Quite similar to the male; abdomen pointed. 



Length 1,8—2,3 mm. 



This species I can distinguish from flavipes only by the smaller 

 size and the less thickened legs; generally also the tarsi are not 

 distinctly annulated. 



T. cothurnata is not common in Denmark; Amager, Charlotten- 

 lund; on Langeland at Lohals, and on Bornholm at Rø; my dates 

 are only ^^/c— ^'/7. 



