194 Orthorrhapha brachycera. 



are larger than below. The incision in the middle of the inner eye- 

 margin present and distinct, The vertex with three oceUi and some 

 hairs. The antennæ are inserted near to each other, in the middle; 

 they are relatively long, always longer than the head. They consist 

 of five joints; the two basal joints are short, the first cylindrical, the 

 second somewhat globular, the third joint is long, compressed, very 

 sHghtly or not attenuating towards the apex, and thus somewhat 

 band-shaped; the two last joints form a style, the basal joint of 

 which is very small (only seen with the microscope); the style may 

 be thicker or tliinner, the apex is somewhat bristle-shaped, and this 

 bristle-shaped part is longest and most distinct, when the style is 

 thin ^ Epistoma is not narrow; the jowls are almost not developed, 

 only present as a small rim. Glypeus is somewhat horse-shoe-shaped. 

 Proboscis is short, not as long as the head is high; it is directed 

 downwards or more or less forwards. Labrum is strong, straight, broad 

 at the base and semitubular, with three short points at the apex; 

 hypopharynx is well developed, as long as labrum, canaliculated, and 

 pointed at the apex; it has two, somewhat deep excisions below the 

 apex, so that there are three points in all, the middle the longest; 

 the maxillæ are shorter, very thin and thread-like, the maxillary palpi 

 one-jointed, somewhat club-shaped with dilated apex, and somewhat 

 compressed; labium is about of the length of the labrum or a little 

 longer, the labella are somewhat shorter than the basal part. Thorax 

 is rectangular, arched above; pro- and metathorax very small. There 

 are no specialised dorsocentral and acrostichal bristles, the disc being 

 uniformly clothed with short hairs, but these are, however, divided 

 into three parts by two longitudinal, bare stripes, the hairs on these 

 parts answering to the dorsocentral and acrostichal bristles. On the 

 sides of the disc only a notopleural and a postalar bristle present. 

 Scutellum has six marginal bristles. Metapleura are bare. Abdomen 

 is slender; it consists in the usual way of eight segments; in the male 



1 Loew says in his monograph (Neue Beitr. zur Kenntn. der Dipt. VI, 1S59, 44) 

 tliat the second joint of the style „erscheint . . . entweder in Folge seiner kurzen 

 aber dichten Behaarung plump, hochstens am Ende borstenformig zugespitzt, 

 oder es hat die Gestalt einer kurzen, dicken Borste." From this passage it 

 might be thought, that it is only when the style is thick, that it is densely 

 hairy, but it is also hairy, when it is thin, and it is in both cases constructed 

 about in the same way, the only difference being the thickness and the pre- 

 sence of a terminal, bristle-shaped, bare part in the thin style, which part is 

 very short or almost wanting in the thick style. Loew speaks only of the 

 second joint, but it is more correct to speak of the whole style, as the small 

 basal joint is of the same thickness as the second, and under a lens not to 

 be discerned from this. 



