306 Orthorrhapha brachycera. 



hairs. Hypopygium relatively not small, roundish, with some hairs at 

 the end; of appendages I find farthest forwards (the hypopygium in situ) 

 a pair of yellow, somewhat lancet-shaped lamellæ, with a bristle on 

 the upwards turned margin, probably the ventral lobes; behind them 

 a small, flat, black process, cleft at the apex, perhaps the penis- 

 sheath, ^ and then the outer lamellæ, which are pale yellow, pointed 

 oval or lancet-shaped, with dark hairs. Legs yellow, posterior coxæ 

 a little brown at the base; tarsi blackish towards the apex, the front 

 tarsi quite dark and the apical part of the front tibiæ more or less 

 darkened; the hind metatarsus is considerably shorter than the second 

 joint. The legs have short, blackish or brownish hairs, the coxæ 

 pale-haired; the anterior coxæ have besides brownish, bristly hairs 

 anteriorly, the hind coxæ a bristle on the outer side; the front femora 

 have a little longer hairs below, and a pale bristle below near the 

 base; the posterior femora have one or a pair of preapical bristles; 

 the front tibiæ have a small bristle above near the base, the middle 

 tibiæ two antero-dorsal bristles, and one postero-dorsal near the base; 

 hind tibiæ with two dorsal rows of bristles. Wings a little yellowish; 

 veins brown, discai and cubital veins almost parallel, slightly diverging 

 towards the apex. Squamulæ dark yellow, with a yellow fringe. 

 Halteres yellow. 



Female. Similar to the male. Epistoma slightly broader, grey. 

 Antennæ a little shorter, quite dark. Front femora Avithout any 

 bristle below near the base. 



Length 2 — 2,4 mm. 



A. cinereus is very rare in Denmark, only one specimen, a female, 

 has been taken in Geel Skov in a fen on ^^h 1909 (the author). It 

 is observed to occur at the borders of water among reeds, and to 

 have two generations, one in early spring and a second in late sum- 

 mer or autumn. 



Geographical distribution : — Northern and middle Europe down 

 into Austria and Bohemia; towards the north to southern Sweden. 



2. A. flavicoUis Meig. 



1824. Meig. Syst. Beschr. IV, 56, 24 {Porphyrops). — 1843. Zett. 

 Dipt. Scand. Il, 480, nota, et 619, 106, et 1849. VIII, 3100, 106, et 1855. 

 XII, 4640, 106 (Dolichopus). — 1862. Schin. F. A. I, 184. - 1903. Kat. 

 palåarkt. Dipt. II, 337. — Rhaphium pallidum Zett. 1843. Dipt. Scand. II, 

 480, 22, et 1849. VIII, 3063, 22. 



^ It seems to he this organ, vvhicli Mik I. c. considers as inner lamellæ. 



