Empididae. 185 



three ocelli on the vertex, and some small hairs. The antennæ are 

 inserted near to each other in the middle, or sometimes a little above 

 the middle. They are five-jointed ; the first joint is very short, the 

 second about globular, the third more or less elongated, attenuated 

 towards the apex and compressed; the two last joints form a shorter 

 or longer style, the first joint of which is short, the second long and 

 terminating in a bristly part, which is bare. Epistoma is very nar- 

 row; jowls are not developed, the eyes going quite to the mouth 

 aperture. About the mouth parts I can only say very little, as I 

 have only been able to examine dried specimens. The proboscis is 

 very short, only stretching slightly out of the mouth aperture ; labrum 

 is strong, broad at the base, curved downwards towards the apex; 

 the maxillary palpi are short, one-jointed, somewhat club-shaped. 

 Thorax is rectangular, rather highly arched above; prothorax is very 

 small, and likewise metathorax. There are somewhat short uniserial 

 dorsocentral bristles and biserial acrostichal bristles; the former show 

 a long bristle behind. A humeral bristle, a pair of posthumeral, one 

 to three notopleural, a supraalar and a postalar bristle present. 

 Scutellum has about four to eight marginal bristles. The metapleura 

 are bare. Abdomen is somewhat slender, often a little compressed; 

 it consists of eight segments ; as usual the first is small, the second the 

 longest. In the male the abdomen is only slightly attenuated towards 

 the apex; the male genitalia are small, in flavipes they form a very 

 small forceps, consisting, so far as I have seen, of a pair of straight 

 lamellæ with small teeth at the apex, and between the lamellæ a 

 thin, styliform process (penis'?); in clavipes the forceps is a little 

 larger, and it seems to be somewhat unsymmetrical. In the female 

 the abdomen is pointed towards the apex, and it terminates with 

 two small and short styles. The legs are slender, the hind legs the 

 longest; the hind tibiæ may be more or less thickened towards the 



Fig. 71. Wing of T. flavipes. 



apex. The legs have shorter or longer, fine hairs, sometimes the 

 hind legs have stronger bristles. The tibiæ have no apical spurs. 

 There are two claws, and two well developed pulvilli; the empodiurn 



