402 Orthorrhapha brachycera. 



not longer at the hind margins of the segments; only the first seg- 

 ment with longer hindmarginal bristles. Venter greyish, with brownish 

 hairs. Legs quite blackish or dark brownish, coxæ a little greyish, 

 trochanters paler brown; hind metatarsus scarcely half as long as the 

 second joint. The legs have very short, black hairs; front tibiæ with- 

 out bristles; middle tibiæ with two distinct antero-dorsal and one 

 postero-dorsal bristle; hind tibiæ with a pair of dorsal bristles near 

 the base and one just above the apex, and on the ventral side with 

 a couple of very small bristles. Wings brown, almost blackish brown ; 

 veins blackisji. Sqaamulæ brownish or blackish, with a black fringe, 

 Halteres yellowish brown. 



The male has the epistoma narrow^ downwards, and without 

 bristles. Palpi smaller than in the female, black. Hypopygium short, 

 black, the outer lamcUæ elongated oval, yellow, hairy. The hind 

 metatarsus still shorter than in the female, about a quarter of the 

 length of the second joint. 



Length 1,8 mm. 



A. niger is very rare in Denmark, only one specimen, a female, 

 has been taken in July 1883, on Bornholm at Allinge (H. J. Hansen). 



Geographical distribution: — The species has otherwise only been 

 found in Hungary. 



34. Thinophilus Wahlbg. 



Species of medium size, and of dark, slightly metallic colours. 

 Head a little broader than thorax, about as broad as high, almost 

 squarely roundish in circumference, a little narrowed downwards; it 

 is slightly arched behind. Vertex a little excavated, ocellar tubercle 

 prominent. Frons broad, a little decreasing in breadth towards the 

 antennæ. There are ocellar, outer vertical and postvertical bristles, 

 the latter placed towards the middle; besides there are some small 

 hairs on the posterior side of the ocellar tubercle. Eyes large, some- 

 what oval, narrowed downwards; they are densely hairy. The facets 

 are slightly enlarged towards the epistoma. In the living specimens 

 the eyes are metallic green, with the upper corner reddish; they are 

 broadly separated in both sexes, most in the female. The postocular 

 bristles form a single row above, the lower part of the occiput is 

 covered with hairs; just above, at the upper eye-corner, there are 

 about three small bristles outside to the row. The antennæ are in- 

 serted near to each other, somewhat high above the middle; they are 

 short, of the same shape in both sexes, the third joint is roundish 



