Empididae. 215 



aperture with the labella. Labrum is very short, broad and arched; its 

 front margin is not pointed but straight, and beset with small dents; 

 hypopharynx is very broad, it is divided into a somewhat long, me- 

 dian, more or less narrow and poinfed lobe, and two shorter and 

 broader lateral lobes; there are no maxillæ, but one-jointed or indi- 

 stinctly two-jointed maxillary palpi, which are somewhat dilated to- 

 wards the end and somewhat compressed; in rest they are curved 

 forwards and cover the labrum. Labium has a short, well chitinised 

 basal part, a little longer and somewhat broader labella, which are 

 directed forwards, and cleft to the base. Thorax is rectangular, rather 

 long, somewhat arched above. Prothorax is distinct, but small, me- 

 tathorax very small, and there is a small, distinct metasternum. There 

 are long, uniserial dorsocentral bristles, sometimes with some shorter 

 bristles between them in the same row; the acrostichal bristles short, 

 biserial, often absent. A humeral bristle (rarely two to three), a post- 

 humeral, one or generally two notopleural, a supraalar and a postalar 

 bristle present; sometimes the supraalar bristle is absent. Scutellum with 

 two, rarely more, long marginal bristles; sometimes there are besides 

 smaller hairs. Metapleura with fme, shorter or longer hairs. ^ Abdo- 

 men somewhat slender, consisting of eight segments; the first segment 

 short, the second the longest. The exterior genitalia in the male are 

 somewhat curious, and remind one of the structure in Hilara. The se- 

 ventli and eighth abdominal segments are suddenly lower than the 

 preceding, and they are not quite chitinised above, but they are here 

 covered by the genitalia, which are directed forwards. It thus looks 

 as if there were only six dorsal segments. The genitalia consist of 

 a forceps, formed of two pairs of lamellæ, an outer, shorter pair, and 

 an inner, longer and in shape generally more complicated pair; the 

 first pair answers to the lower and the second pair to the upper 

 lamellæ, but on account of the recurved direction of the forceps, the 

 outer, lower lamellæ lie more upwards. Below there is a somewhat 

 pointed ventral lamella, which is stretched straight out or curved 

 upwards, and from the apex of it issues the thread-like, more or less 

 sinuous penis. In the female the abdomen is pointed, the eighth seg- 

 ment is smaller or larger, and terminates with two small and short 

 styles. The legs are long and slender, the front coxæ somewhat, but 

 not much elongated; the front femora are often a little thickened at 

 the base. The legs are chiefly short-haired, the front femora may 



1 Mik says (Wien. ent. Zeitg. VIII. 1889. 150) about Cl. stylifera, that Ihis spe- 

 cies has no notopleural hairs; I think it possible, that these fine hairs have 

 been lost. 



