42 Orthorrhapha brachycera. 



Labrum a little longer than the head is high; palpi black, wilh black 

 hairs. Antennæ about as long as the head, black, the two basal 

 joints greyish. Thorax grey, very slightly shining, with two dark or 

 blackish grey stripes; the dorsocentral and acrostichal bristles very 

 short, biserial, brownish; further a hiimeral, a posthumeral, three 

 notopleural, some supraalar and a postalar bristle ; the humeral, post- 

 humeral and notopleural bristles yellow, the others black; on and 

 behind the humeri there are scarce, yellow hairs. Scutellum greyish 

 with two marginal bristles. Pleura grey, metapleura with pale yellow 

 hairs. Abdomen dark grey with narrow, light grey incisures, slightly 

 shining; venter lighter grey and more dull. Abdomen clothed with 

 long, erect, yellow hairs, those at the hind margins of the segments 

 longestand strengest, fan-like spreading; venter more sparingly haired. 

 The exterior genitalia much as in nigripes; the lamellar processes 

 from the eighth segment larger, the backwards directed processes 

 from the upper lamellæ not angularly bent but gently curved and the 

 triangular outshoot above more tubercle-shaped; the lower lamellæ 

 black, shining, with long, yellow hairs below. Penis thread-like and 

 curved as in nigripes. Legs black; coxæ greyish pruinose; the front 

 metatarsi somewhat thickened, the hind metatarsi practically not 

 thickened, Anterior femora with somewhat long hairs below, on the 

 niiddle femora in antero- and postero-ventral rows; hind femora with 

 a dorsal row of middle-long hairs, and a ventral row^ of relatively 

 few hairs which are long in the apical half; the anterior tibiæ with 

 short hairs and a few longer bristles, the hind tibiæ short-haired 

 ventrally, but with long hairs dorsally most of which are stronger 

 and bristly; the hind metatarsi are similarly haired on the dorsal 

 side, and slightly spinulous on the ventral side; also the middle 

 metatarsi have long, bristly hairs on the dorsal side and are spinulous 

 beneath ; otherwise the tarsi are short-haired. The hairs on the 

 femora, except on the dorsal side of the hind femora, are yellow, 

 the other hairs and bristles black or dark brownish. For the rest 

 the legs have a thin, short, pale pubescence. Wings hyaline; veins 

 blackish; anal vein very pale, not reaching the margin. Stigma very 

 faint, almost absent. Halteres clear white. 



Female. Frons more than twice as broad as in the male, with 

 a fine, impressed middle line. Dorsocentral and acrostichal bristles 

 still shorter. Abdomen light grey, exceedingly short and sparingly 

 haired. Legs nearly bare, only below the hind femora towards the 

 apex some bristle-like hairs, which are blackish; front metatarsi 

 simple. Wings with the discai cell magnified, extended backwards, 

 so that the hinder, lower angle touches the margin, the lower of the 



