48 Orthorrhapha brachycera. 



supraalar and a postalar bristle can be discerned, all black, (Sorae- 

 times a somewhat strong huineral bristle is present). Scutellum grey 

 with about eight black marginal bristles. Pleura dark grey; the meta- 

 pleural bristles black. Abdomen blackish, shining, clothed with erect 

 black or brownish hairs; those at the hind margin of the segments 

 not specially strong. Venter similarly coloured, sparingly haired. Exterior 

 genitalia short, knob-like, shining black; the lower lateral lamellæ 

 short and broad, the upper likewise small and short; both pairs 

 short-haired ; the eighth ventral segment with long hairs at the margin. 

 Penis hidden. Legs robust, black, sometimes brownish, shining, the 

 hind metatarsi somewhat thickened and also the two following joints 

 rather thick; coxæ greyish pruinose; front femora with short, fine 

 hairs on the dorsal and ventral side; middle femora with two rows 

 of short, spine-like bristles on the ventral side; hind femora with two 

 similar rows of somewhat longer bristles, one standing on the postero- 

 ventral side; besides, the posterior femora have a very dense, short, 

 pale pubescence below; the front tibiæ with a very dense, short 

 pubescence ventrally and some bristles dorsally; middle tibiæ with 

 short, spinulous hairs and some bristles ventrally and with two rows 

 of strong bristles dorsally; hind tibiæ with short hairs ventrally and 

 two rows of bristles dorsally; tarsi short-haired, hind tarsi with some 

 few bristles on the dorsal side; besides, the legs have a common, 

 scarce clothing of short hairs. All hairs and bristles black. The 

 posterior femora have a curious, fine, transverse striation, and the 

 same is to a less degree found on the front femora. Wings brownish 

 fumigated. Veins brown, anal vein reaching the margin. Stigma 

 very faint, brownish. Costa with no long bristles but a tuft of short 

 hairs at the base. Balteres yellow. 



Female. Eyes broadly separated; frons dark grey. The hairs 

 on the thoracic disc shorter than in the male. Abdomen dark brownish 

 grey, very short and sparingly haired, only at the sides in front there 

 are longer hairs. Legs less haired than in the male, middle femora 

 with the rows of bristles on the ventral side very short, and hind femora 

 only with one row of much shorter bristles than in the male, and 

 besides with some postero-ventral bristles in the apical part; tibiæ 

 less bristly, but the hind tibiæ besides the dorsal bristles with a 

 dense row of short, strong hairs; the posterior femora without the 

 dense, short pubescence, the hind femora instead with short, some- 

 what strong hairs. Hind tarsi not thickened. 



Length. This species may vary somewhat in size, the length 

 being 5,5 to about 8 mm. 



Remarks: Schiner's description of the spinulosity of the legs is 



