284 Orthorrhapha brachycera. 



thus I took it on '^le at Ørholm swarming numerously over a ditch 

 in a meadow. 



Geographical distribution:— Northern and middle Europe down 

 into Styria and Hungary; towards the north to southern Sweden. 



1(3. Macliaeriuin Hal. 

 This genus again shows resemblance to Forphyrops, but is in 

 some respects characteristically different. The frons is broad, some- 

 what decreasing in breadth towards the antennæ. There are the 

 usual ocellar, outer vertical and postvertical bristles, and a pair of 

 small hairs on the ocellar tubercle. The eyes are hairy, the facets 

 very slightly enlarged on the front side. The eyes are well separated 

 in both sexes, the epistoma somewhat broad in the male, but a little 

 narrowed upwards; in the female it is broader and with parallel 

 horders ; the clypeus is somewhat marked off by a little elevation at 

 each side, it is widened downwards in the male; the lower margin 

 is somewhat angular and a little pointed; it reaches as far down as 

 the lower margin of the eyes. The postocular bristles form a single 

 row above, but below the whole occiput is covered with longish 

 hairs, not interrupted above the oral aperture. The antennæ inserted 

 near to each other, slightly above the middle; they are long or short, 

 of the same length and the same shape in both sexes; the two basal 

 joints are short, the second not overlapping the third; this latter is 

 long or (in non Danish species) short, but in both cases thick at the 

 base but incised below from near the base towards the apex, so that 

 the last part in the long antennæ is thin^; the arista is apical, its 

 first joint short and somewhat thick, the second thin and exceedingly 

 fine towards the apex; in the long antennæ the arista is shorter than 

 the third joint, in the short antennæ it is longer than the antennæ; 

 the basal antennal joint is bare above, the second has small bristles 

 at the apex, the third is very short-haired, somewhat longer below, 

 and the arista apparently bare. The proboscis, palpi and mouth 

 aperture are only a little larger in the female than in the male, and 

 the proboscis somewhat protruding in both sexes. Haliday figures 

 (Zool. Journ. V, 1831, 351, Tab. XV, fig. 12) the mouth parts, which 

 are seen to be of the usual structure (the author considers the teeth 

 on the lower side of labruni as mandibles and figures below them a 



^ In M. maritimae the third joint shows a curious structure, only seen by the 

 microscope; it has a thin-skinned, translucent area below (Fig. 89, marked by 

 the dotted line), and this area is in front a little projecting, forming, as it were, 

 a small tooth; in the dried condition it is not seen. 



