198 Orthorrhapha brachycera. 



first joint only reaching just beyond the apex of the third 



antennal joint; middle tarsi about as long as tibiæ 2. ohscurellus. 



3. Front metalarsi in the maJe with long hairs below. Hypo- 



pygium large, with long ventral lobes 3. crinipes. 



— Front metatarsi in the male with short hairs below. Hypo- 

 pygium small, with shorter ventral lobes (only the male 

 known) ^- crinicaiida. 



1. H. discipes Ahr. 



1817. Ahr. Faun. Ins. Eur. IV, 24 (Dolichopus). — 1824. Meig. Syst. 

 Beschr. IV, 71, 1 {Sybistroma). — 1842. Stæg. Krøyer's Tidsskr. IV, 4, 1 

 {SyUstroma). — 1862. Schin. F. A. I, 226. — 1903. Kat. palåarkt. Dipt. 

 II, 314. — Dolichopus patellatus Fall. 1823. Dipt. Suec. Dol. 10, 5. — 

 1843. Zett. Dipt. Scand. II, 583, 72. — Sybistroma patellipes Meig. 1824. 

 Syst. Beschr. IV, 72, 2. 



Male. Head as high as broad. Vertex and frons whitish grey, 

 the ocellar tubercle darker. Epistoma narrow, greyish white. Palpi 

 dark. Occiput somewhal æneous, densely grey pruinose: postocular 

 bristles black above, yellowish below. Antennæ considerably longer 

 than the head, black, the third joint may be somewhat translucently 

 brownish or reddish; it is elongated, much longer than broad, some- 

 what lancet-shaped; the arista has the first joint very long, twice 

 as long as the second. Thorax æneous olive or somewhat greenish, 

 brownish pruinose, only slightly shining; the humeral callus yellowish. 

 Pleura slightly æneous, grey pruinose, metaepimera reddish yellow; 



Fig. 59. H. discipes. Hypopygium ; ventral lobe, outer lamella 

 and dorsal median appendage are seen. 



propleura with fine, pale hairs and a black prothoracic bristle. Ab- 

 domen greenish, æneous or more or less coppery, especially above, 

 slightly whitish grey pruinose downwards; it is clothed with short, 

 black hairs, at the base and just at the sides there are yellowish hairs; 

 the hindmarginal bristles short, somewhat longer towards the apex, and 

 long at the sides of the first segment. Venter yellow with yellow 



