288 Oiihorrhapha brachycera. 



very slightly enlarged in front towards the epistoma in the males. 

 The frons decreases a little in breadth towards the antennæ. The 

 eyes are separated in both sexes, the epistoma is somewhat narrow 

 in the male, but not as narrow as in Porphyrops, narrowed down- 

 wards; in the female it is broader, but not as broad as in Syntormon^ 

 with parallel horders. The clypeus is slightly marked off in the males; 

 in the females it is more distinctly marked off by an elevation at 

 each side and a more or less distinct, transverse, impressed line; its 

 lower margin is in this sex triangularly rounded; it does not reach 

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

 row above, but the lower half of occiput is covered with hairs, which 

 are also present above the oral aperture; they are however not so 

 long and dense as in Porphyrops. The antennæ are long in the 

 males, with the third joint very elongated, band-shaped, from six to ten 

 times as long as broad, rarely shorter {brevicorne, non Danish); they 

 are short in the female with the third joint more or less triangular; 

 the arista is apical (rarely a little subapical), short or very short in 

 the male, longer than the antennæ in the female; the seeond antennal 

 joint is simple, not overlapping the third. The first joint is bare 

 above,' the seeond has small bristles at the end, the third and 

 the arista are short but distinctly hairy. The mouth parts and 

 oral aperture are considerably larger in the female than in the 

 male, and in the former sex the proboscis is somewhat protruding. 

 The thoracic disc has short, biserial acrostichal bristles; the dorso- 

 central bristles are somewhat varying; there are generally six, but the 

 foremost is small, and sometimes indistinct, so that there are only five ; 

 in fasciatum I found always only four; there is as usual a humeral, 

 a posthumeral, two notopleural, a præsutural, three supraalar and a 

 postalar bristle. The front part of the disc has only a few small 

 hairs. Scutellum is bare above, with two marginal bristles and on 

 each side a small hair. Propleura with few, short hairs. Abdomen 

 cylindrical, in fasciatum somewhat compressed; in the male there are 

 six visible dorsal segments and five ventral. The hypopygium is small, 

 roundish, but exposed, and the appendages are visible; there are 

 shorter or longer ventral lobes, variously provided with hairs and 

 bristles; the outer lamellæ are likewise shorter or longer, hairy and 

 sometimes with^long hairs. In the female there are five visible ab- 

 dominal segments. Dot-like impressions are present on some of the 

 segments, at all events in the female. The abdominal segments have 

 somewhat short hindmarginal bristles. The legs have the coxæ and 

 femora only short-haired ; in the male the middle coxæ have, as in 

 species of Porphyrops, an apical spine, but it is small, of pale colour. 



