318 Orthonhapha biachycera. 



wards on the humeri. The iiniserial dorsocentral and biserial acro- 

 stichal hairs short and few in number, greyish yellow; there are no 

 long dorsocentral bristles ; one distinct, yellow notopleural bristle (and 

 one vveaker). Scutellum with two brown marginal bristles, and on 

 each side a small hair; postscutellum yellow pruinose. Pleura black, 

 shining, only pruinose in front, above the front coxæ and above the 

 hypopleura. Abdomen black, somewhat shining, with very short, 

 yellowish hairs. Venter black. Legs yellow, tarsi narrowly and in- 

 distinctly brownish annulated, the last joint blackish; the middle 

 knees distinctly black. The front femora a little, the middle femora 

 more thickened; the apical spine on the middle tibiæ rather large, 

 black at the apex. The legs are yellowish haired. Wings hyaline. 

 Veins yellow or pale brownish. Balteres yellow. 



Length 2,7 mm. 



This species is characterised by the yellow antennæ, the few 

 hairs on the thoracic disc, and the want of longer dorsocentral bristles 

 behind. 



T. thoracica seems to be very rare in Denmark, only one specimen, 

 a female, has been taken on Langeland at Lohals on -V; 1909 (the 

 author). 



Geographical distribution : — Besides in Denmark the species also 

 occurs in Germany, as Mr. Becker, who has seen my specimen, has 

 kindly communicated to me, that he also has the species in his 

 collection. 



29. T. pallipes Fall. 



1815. Fall. Dipt. Suec. Empid. 8, 6 p. p. — 1842. Zett. Dipt. Scand. I, 305, 

 40, et 1849. VIII, 3009, nota. — 1862. Schin. F. A. I, 90 {Plattj palpus). 

 — 1903. Kat. palåarkt. Dipt. II, 287. — Tachydromia flavipalpis : 1822. 

 Meig. Syst. Beschr. III, 74, 15. — 1842. Zett. Dipt. Scand. I, 288, 19. — 

 Platypalpus flavipalpis: 1862. Schin. F. A. I, 90. 



Male. Frons and vertex black, slightly greyish ; epistoma narrow, 

 black; palpi yellow, large, as long or almost as long as the black 

 proboscis. Occiput greyish, with pale bristles above and whitish hairs 

 below. Antennæ black or brownish black, the third joint elongated 

 triangular, considerably shorter than the arista. Thorax black, shining, 

 the margin slightly greyish pruinose ; the disc is uniformly and densely 

 clothed with short, greyish yellow hairs; a pair of indistinct, scarcely 

 observable, weaker haired stripes indicate a division into dorsocentral 

 and acrostichal hairs ; there is one longer, yellow dorsocentral hair 

 behind, and two black notopleural bristles; no humeral bristle. Scu- 

 tellum with two black marginal bristles, Pleura greyish pruinose; 



