242 Orthorrhapha brachycera. 



occupying the whole front side of the head, and a little prominent, 

 so that frons and vertex are a little impressed; they are short-hairy; 

 above the antennæ they are well separated in both sexes, but below 

 they are touching for a long distance^ The facets in the front part of 

 the eye are enlarged in both sexes. The incisure in the inner eye- 

 margin is distinct. The vertex has three ocelli and a pair of ocellar 

 bristles. The antennæ are inserted near to each other, considerably 



Fig. 106. Antenna of T. longicornis. X 55. 



above the middle; they are extraordinarily long, three- jointed ; the 

 first joint is cylindrical, a little elongated, the second almost globular, 

 the third is a little compressed and tapers evenly into a long, down- 

 wards curved arista, which cannot under the microscope be seen to 

 be articulated at any point. Epistoma is very small on account of 

 the long connection of the eyes; the jowls are almost not developed. 

 Clypeus is somewhat horse-shoe-shaped. Proboscis is somewhat thin, 

 scarcely as long as the head is high; it is stretched downwards. La- 

 brum is of the length of proboscis, strong, semitubular, three-pointed 

 at the apex; hypopharynx is as long as labrum, thin, slightly dilated 

 at the apex and pointed; the maxillæ are somewhat shorter, lancet- 

 like blades; the maxillary palpi are not short, they are one-jointed, 

 thin at the base but dilated and somewhat ovate towards the apex, 

 and with some long hairs. Labium has the labella not large, shorter 

 than the basal part, and cleft to their base. Thorax is rectangular, 

 somewhat high and much arched above; pro- and metathorax small. 

 The disc has long, uniserial dorsocentral bristles but no acrostichal 

 bristles. Further a humeral bristle, a posthumeral, a larger and a 

 smaller notopleural, a supraalar and postalar bristle; besides there is 

 a bristle inwards to the humeri. Scutellum with two marginal bristles. 

 Metapleura bare. Abdomen is somewhat long and slender, it consists 

 of eight segments, the flrst is short, the second the longest. In the 

 male the seventh and eighth segments are lower than the preceding 

 and covered by the genitalia; these latter have' a construction re- 

 caliing somewhat that in Hilara; they consist of a compressed 

 lower part, perhaps representing the ventral lamella, above this part 



^ Meigen says, that the eyes of the male are touching above, but this is, as al- 

 ready noted by Schiner, erroneous, but none of these authors mention, that 

 they are toiiching below, whereas Stein (1. c.) correctly notes this. 



