152 Orthorrhapha brachycera. 



behind are interrupted in the middle, as there are no bristles above 

 the aperture. Aiitennæ as in Dolichoims, but the arista very distinctly 

 haired, almost feathered; the basal antennal joint hairy above. The 

 niouth parts are somewhat larger in the female than in the male. 

 The thorax has always a purplish black spot at the upper corner of 

 the præsutural depression. Acrostichal bristles biserial and distinct; 

 the other thoracic bristles long; there are six dorsoeentral bristles, 

 one strong humeral bristle and a couple of weaker, two posthumeral, 

 one præsutural, three supraalar, two notopleural and one postalar 

 bristle; besides there are small hairs on the front part of the disc, 

 of which some of the hindmost may be rather long. Scutellum only 

 with a few hairs above and at the margin, and with two strong 

 marginal bristles and on eaeh side a small hair. Propleura with fine 

 hairs and a prothoracic bristle. Abdomen as in DoUchopus, the fifth 

 dorsal segment somewhat long, the sixth small, partly or quite hidden, 

 the seventh segment likewise more or less hidden. The first sternite 

 is only an exceedingly narrow chitinisation, sternites two to four are 

 normal, the fifth for the greatest part membranous, only chitinised 

 at the sides, the sixth is a somewhat V-shaped chitinisation, the seventh 

 segment has a narrow^ sternite. The hypopygium is somewhat high, 

 much compressed in the upper part; it is free, but not distinctly 

 pedunculated as the sixth and seventh segments are small; the hypo- 

 pygium is somewhat short and has broad, triangular lobes on the 

 ventral side in the middle, and at the end two pairs of inner laraellæ; 

 the outer lamellæ somewhat large, with long teeth at the end. In 

 the female the abdomen shows five normal segments and three hidden, 

 the last terrainating with some small spines and below them two small 

 styles. The second, third and fourth abdominal segments have dot- 

 like impressions at the side margins, and the segments have hind- 

 marginal bristles. Legs as in DoUchopus, posterior femora with one 

 preapical bristle, hind metatarsi of the length of the second joint, 

 without bristles above; only one species {regalis, non Danish) is 

 aberrant in this respect, and has bristles. Wings somewhat variegated 

 in the male with blackish and white spots; they have the radial, 

 cubital and discai vein somewhat near to each other; the discai vein 

 has only a very small bend, but is converging towards the cubital 

 vein, and the first posterior cell thus narrowly open; anal vein some- 

 what long, but not reaching the margin, Axillary lobe very small or 

 almost wanting. The discai vein has a distinct convexity about in 

 the middle of its last part. Alar squamula with the angulary lobe 

 well developed, bearing a fan of long hairs at the margin, the inner 

 part of the squamula with short hairs. 



