164 Orthorrhapha brachycera. 



end; the median dorsal appendage is hoois-shaped and has on each 

 side at the base a long, likewise hook-shaped lobe, so that the appen- 

 dage is tripartite; the outer lamellæ are somewhat large, about trian- 

 gular, with the dorsal apical corner drawn somewhat out; they are 

 black or brownish black, the whole ventral margin has long teeth 

 with black, curved hairs, and besides there are hairs inserted at the 

 margin. Legs yellow, front coxæ whitish pruinose anteriorly, posterior 

 coxæ grey, yellow at the apex; front tarsi with the apex of meta- 

 tarsus and the four folio wing joints black, posterior tarsi and the apex 

 of the hind tibiæ black. The legs have short, black hairs, front coxæ 

 white-haired towards the outside; posterior femorawith one preapical 

 bristle; front tibiæ with bristles above and on the postero-ventral 

 side; middle tibiæ with four rows, and hind tibiæ with two dorsal 

 and one ventral row of bristles. Wings with the axillary lobe small; 



Fig. 49. Wing of P. nobilitatus d- 



on the apical part there is a blackish, transverse band, most black 

 towards the anterior margin; it stretches about from the posterior 

 cross-vein to the end of the cubital vein, and the apex of the wing 

 outwards to the band is snow-white; the veins are black, the radial 

 and cubital veins, and the apical part of the discai vein are some- 

 what undulated; the cubital vein curves downwards at the apex, and 

 the first posterior cell is thus narrowly open; anal vein somewhat 

 long. Squamulæ yellow, Avith a black fringe. Halteres yellow. 



Female. Epistoma broad. Antennæ of about the same length 

 as in the male. Wings with the transverse band only slightly tinged, 

 indistinct and indistinctly bordered, and without any white spot at 

 the apex; the radial, cubital and discai veins only slightly undulated, 

 almost straight. 



Length 4,5 — 6 mm. 



P. nobilitatus is common in Denmark on suitable localities ; Frede- 

 riksberg Have, Amager, Nordskoven at Jægerspris, Faxe Ladeplads ; on 

 Funen at Hoffmansgave ; in Jutland at Ribe and on the little island 



