Empididae. 263 



higher than broad. Occiput somewhat conical, with a few bristles 

 above. Eyes high; they are in both sexes separated above the an- 

 tennæ, leaving a narrow frons between them; below tiie antennæ tiiey 

 are touching, and the facets are here in both sexes a httle enlarged; 

 the hind margin is a little incurved, the Iower posterior corner drawn 

 a little out backwards. The incision in the middle of the inner eye- 

 margin distinct. In the living specimens the eyes are brown and a little 

 metallic. There are three ocelli, placed somewhat forwards, so that 

 the upper posterior corner of the eye lies somewhat behind the ocelli. 

 No ocellar bristles. The antennæ are inserted somewhat near to each 



Fig. 120. Antennæ of T. nuUla. x 100. 



other, aboiit in the middle; they are four-jointed, the basal joint is 

 very short, almost ring-like, the second somewhat longer, the third ovate, 

 compressed and terminating with a long, unjointed arista, forming the 

 fourth joint. Epistoma is very small on account of the touching eyes. 

 Jowls not developed. Proboscis short, stretched downwards and more 

 or less inwards (backwards). Glypeus consists of two small lists. La- 

 brum is as long as labium, semitubular or almost tubular, strong, high 

 at the base and three-pointed at the apex, the lateral lobes are some- 

 what hook-shaped, the median broad and rounded, beset with spines 

 below; hypopharynx is a lancet-shaped blade, as long as the labrum, 

 pointed and with a pair of spines below at the apex. There are no 

 maxillæ, but ovate, compressed, one-jointed maxillary palpi, with strong 

 bristles at the apex. Labium has somewhat large labella with some 

 bristles, they are not cleft quite to their base, and between them 

 there is a relatively large, median lobe. Thorax is elongated, rect- 

 angular, a little narrowed in front, and not much arched above; the 

 humeri are distinctly marked off by an impressed furrow. Pro- and 

 metathorax are small, the latter however visible as a narrow rim be- 

 hind the postscutellum. There are uniserial dorsocentral and biserial 

 acrostichal bristles on the disc, but they are very small, almost puncti- 

 form and scarcely observable; there are two notopleural bristles. 

 Scutellum with two marginal bristles. Metapleura bare. Abdomen 

 somewhat slender; it consists of eight segments, but the last is small 

 and hidden; the first dorsal segment is very short, and there is no 

 chitinised first ventral segment. The male genitalia are somewhat 

 large; they consist {nubila) of a large ventral piece, and above it lies 

 a pair of complicated, not symmetricai lamellæ, and perhaps still a 



