278 Orthorrliapha brachycera. 



plate black-haired. Legs black, the front femora somewhat thickened. 

 The front femora with a row of strong hairs above and two rows 

 below ; middle femora with shorter hairs below, and with bristles on 

 the antero-dorsal side in the apical half; hind femora with bristles 

 on the antero-dorsal and on the ventral side; all femora with a 

 strong bristle on the anterior side near the apex; front tibiæ with a 

 few bristles on the dorsal side, and two long, subapical bristles on 

 the ventral side; middle tibiæ short-haired, with a few short bristles 

 above and a long, subapical bristle below; hind tibiæ with long bristles 

 on the dorsal, anterior and ventral side in the apical two thirds, and 

 the hind metatarsi with a bristle in the middle on the posterior side; 

 for the rest the legs densely short-haired, especially the anterior tibiæ 

 densely ciliated below. All hairs and bristles black. Wings greyish. 



Fig. 126. Wing of Ch. hirta. 



a little brownish towards the anterior margin. The velns thick, brown, 

 the postical cross-vein quite perpendicular. Halteres yellow or reddish 

 yellow. 



Female. Similar to the male; abdomen very short-haired, and 

 pointed. 



Length 3 — 4 mm. 



In not fuUy mature specimens the legs may be somewhat brownish. 



Ch. hirta has hitherto been taken only on the sea-shore at Tisvilde ; 

 it was present in rather great numbers, and it occurs probably also in 

 other piaces in Denmark at sea-shores. It was for the first time 

 taken in 1909 on the ^^'/7 and ^^h (the author). It was also taken 

 in copula. 



Geographical distribution: — Europe and down into North Africa; 

 it is not known north of Denmark, but it occurs in England. 



± Ch. cursitans Zett. 

 1819. Zett. Vetensk. Akad. Handl. 1819, 82, 36 (Empis). — 182R. 

 Fall. Dipt. Suec. Suppl. I, 7, 20 — 21 {Tachydromia) . — 1842. Zett. Dipt. 

 Scand. I, 322, 12 (Tachypeza). — 1903. Kat. palaarkt. Dipt. II, 278. 



Male. Frons and vertex dark grey; epistoma and palpi light grey. 

 Occiput greyish, with four long, black bristles above, and with short 



