156 Orthonhapha brachycera. 



metatarsus and the four folio wing joints black; the fifth joint has the 

 hairs at the upper margin mainly white, and the puvilli are large, 

 white; the posterior tarsi black with the basal part of metatarsus 

 yellow. The legs have short, black hairs, the front coxæ somewhat 

 longish hairs anteriorly ; below the femora the hairs also a little longer, 

 and the middle femora with long, bristly hairs below at the base; 

 middle femora with one, sometimes two preapical bristles, hind femora 

 with a number (five to nine) in two rows. Front tibiæ with bristles 

 above and on the postero-ventral side; middle tibiæ with two dorsal 

 rows, and sometimes a ventral bristle; hind tibiæ with two dorsal 

 rows of bristles and a ventral row. Wings slightly greyish tinged; 

 veins black; costa thickened on streak between the base and the 

 apex of the subcostal vein; discai vein with a small bend, the apical 



Fig. 47. Wing of T. ammohates c?. 



part converging towards the cubital vein, the first posterior cell nar- 

 ro wly open; the bend lies nearer to the apex of the vein than to the 

 posterior cross-vein, or about in the middle; the posterior cross-vein 

 curved with the convex side outwards; it is placed after the middle, 

 the apical part of the postical vein being shorter than the cross-vein; 

 there is a more or less distinct blackish or brownish spot at the bend 

 of the discai vein, and a seam at the posterior cross-vein. Squamulæ 

 whitish yellow, with a black fringe. Halteres whitish yellow, the 

 base of the peduncle darkened. 



Female. Epistoma a little broader than in the male, as it is 

 less narrowed above, grey or pale greyish yellow. Antennæ some- 

 what shorter than in the male. Front tarsi simple (but however a 

 little compressed); middle femora without prominence below. The 

 legs more bristly, front tibiæ with two ventral rows. 



Length 5,3—5,8 mm. 



T. ammohates is common in Denmark on suitable localities; 

 Fure Sø, Sorø Sø, Løng Sø at Sorø; in Jutland at Nymindegab, Ma- 

 dum Sø near Skørping, Frederikshavn, Hulsig north of Frederikshavn, 

 and on Læsø. My dates are ^h — ^r./g it occurs at the sandy bor- 



