284 Orthorrhapha biachycera. 



apical spine. The legs are mainly short-haired, and there is no siich 

 arinature on the niiddle legs as in Tachijdromia. Wings alniost with- 

 out axillary lobe, and the axillary angle very shallow. 



The developrnental stages are not known. 



Of the genus only one species is known, also occurring in Den- 

 mark. 



1. S. dissimilis Fall. 



1815. Fall. Dipt. Suec. Empid. 9, 9 {Tachydromia). — 1822. Meig. 

 Syst. Beschr. III, 85, 41 {Tachydromia). — 1842. Zett. Dipt. Scand. 1, 

 308, 44 {Tachydromia). — Macroptera pictipes: 1889. Beck. Wien. Ent. 

 Zeitg. VIII, 80, Tab. I, Fig. 3 — 5. — Symhallophthalmiis pictipes: 1889. 

 Beck. 1. c. 285. — Symballophthahnus cyanophthalmus: 1893. Strobl, Mittheil. 

 Ver. Steierm. 1892, 123. 



Male. Vertex black; epistoma blackish, dull above, shining below, 

 Palpi yellow. Occiput greyish black, with white hairs which are some- 

 what long above. Antennæ yellowish or brownish. Thorax black or 

 brownish black, shining, with short, pale hairs which form indistinct 

 dorsocentral and acrostichal rows. One long, yellow notopleural bristle 

 present. Scutellum with six fine, yellow marginal bristles. Pleura 

 black or brownish black, somewhat shining. Abdomen black, the 

 basal part yellowish; it is clothed with longish, pale yellowish hairs. 

 Venter similarly coloured and halred. Legs yellow, the apex of the 

 hind femora, the hind tibiæ and all tarsi brownish, sometimes the 

 base of the metatarsi paler. The legs are short-haired with yellowish 

 hairs, the femora with a little longer hairs below; the front metatarsi 

 with long, somewhat bristle-like hairs on the posterior side. Wings 

 hyaline, the subcostal cell somewhat yellowish. The veins pale brown. 

 Halteres pale yellowish. 



Female. Similar to the male; the front metatarsi without long 

 hairs; abdomen pointed. 



Length 2 — 2,5 mm. 



Remarks: The statements by the various authors with regard to 

 the colour of the antennæ and legs are somewhat different, the species 

 may evidently vary somewhat in this respect, the colour of the 

 brownish parts being lighter or darker to blackish. 



S. dissimilis is rare in Denmark, only five specimens have been 

 taken many years ago in Charlottenlund in June by Stæger. 



Geographical distribution: — Northern and middle Europe down 

 into Styria and Switzerland ; towards the north to middle Sweden, 



