102 Orthorrhapha brachycera. 



haired below; posterior femora with one preapical bristle; front tibiæ 

 with bristles above and two on the postero-ventral side; middle tibiæ 

 with three anterior and one postero-dorsal bristle, but with no bristles 

 near the apex (besides the apical); hind tibiæ with two dorsal ro vvs 

 of bristles and one ventral bristle near the apex, besides with a ven- 

 tral row of small bristles; hind metatarsi with about two bristles 

 above, one anterior, and small ventral bristles. Wings slightly yel- 

 lowish tinged ; veins black or blackish brown, costa practically with 

 no swelling; discai vein with a somewhat large, obtuse bend; axillary 

 lobe very large, anal vein going chiefly downwards. Squamulæ yel- 

 low, with a black fringe. Balteres pale yellow. 



Female. Epistoma broader than in the male, but likewise ochra- 

 ceous. Antennæ shorter. Middle legs simple, tibiæ rather long, distinctly 

 longer than the tarsi, with four to five antero-dorsal, two postero- 

 dorsal bristles and one ventral below the middle. Wings a little 

 darker than in the male. 



Length 4,5 — 5 mm. 



This interesting and curious species is very near to and similar 

 to plumipes, but as seen from the description the male is distinguished 

 by many characters; also the female is easily distinguished by the 

 yellow hind tibiæ and base of metatarsi, and especially by the longer 

 middle tibiæ, which in plumipes are not longer than the tarsi. 



D. Wahlhergi is rare in Denmark, only eight specimens are 

 known; Espergærde; in Jutland in Greisdalen at Vejle and at Silke- 

 borg, and on Bornholm at Hammeren (the author). My dates are in 

 June and from ^/s — ^^/s. I can confirm the note by Verrall (1. c.) that 

 it does not occur in company with plumipes or only rarely. Stæger 

 did not know it, but in his collection a male was found, intermingled 

 with plumipes. 



Geographical distribution: — Northern and middle Europe, down 

 into Germany ; towards the north to middle Sweden, and in Finland. 



21. D. pennatus Meig. 



1824. Meig. Syst. Beschr. IV, 90, 28. — 1831. Stann. Isis 1831, 64, 

 15. — 1843. Zett. Dipt. Scand. II, 543, 36, et 1852. XI, 4292, 36, et 

 1855. XII, 4629, 36. — 1903. Kat. palåarkt. Dipt. Il, 301. — DoUchopus 

 popularis p. p. 1823. Fall. Dipt. Suec. Dol. 11, 7. — DoUchopus signatus 

 Stæg. (nec Meig.) 1842. Krøyer's Tidsskr. IV, 25, 16. — 1862. Schin. 

 F. A. I, 217. 



Male. Vertex and frons greenish. Epistoma narrow, ochraceous. 

 Palpi yellow. Occiput green, greyish pruinose; postocular bristles yel- 



