Dolichopodidae. 195 



Geographical distribution : — Northern and middle Europe down 

 inlo the Pyrenees; towards the north to southern Sweden, and in 

 Finiand. 



9. Hypopliyllus Loew. 



Species of medium size and of slender shape, witli long legs; the 

 colour nietaliic green. Head a little broader than thorax, as broad as 

 or broader than high, short seniiglobular, a little narrowed downwards. 

 Occiput slightly arched. Vertex a little excavated, the oeellar tubercle 

 a little prominent. Frons broad, somewhat narrowed towards the 

 antennæ. There are oeellar, outer vertical and postvertical bristles, 

 and a couple of small hairs on the posterior side of the oeellar tuberble. 

 Eyes large, somewhat oval in circumference but narrowest downwards, 

 metallic green with reddish reflexes in the living specimens; they are 

 densely short-haired; the facets are of the same or almost the same 

 size. The eyes are separated in both sexes, narrowly in the male, 

 more broadly in the female. The postocular bristles form a single 

 row, they are not specially strong; there are no bristles on the back 

 of the head above the oral aperture. The antennæ are inserted near 

 to each other, somewhat above the middle; they are five-jointed, the 

 third joint either somewhat elongated in the male, short in the female, 

 or short in both sexes; the first joint is somewhat obconical, the second 

 short, overlapping the third in a similar way as in Dolichopus; the third 

 joint is short or longer, ovate or elongated triangular; the joints are com- 

 pressed, especially the third; the two last joints form an arista, the basal 

 joint of which is of various length; in some species it is in the male 

 very long, longer than the second, in the female shorter, in other 

 species this difference is smaller, or it is very short in both sexes; 

 sometimes it is slightly thickened towards the apex. The arista is 

 inserted dorsally, sometimes rather near the apex. The antennæ 

 have the basal joint hairy above, the second joint has hairs at the 

 apical margin, the third is very short-haired, and the arista bare 

 (microscopically hairy). Epistoma narrow or very narrow in the male, 

 broader in the female; clypeus short, rounded or truncate at the apex; 

 it is slightly marked off from epistoma at each side by a httle eleva- 

 tion with a notch, and it is a Httle arched; it does not reach the 

 iower margin of the eyes. The mouth parts and oral aperture are 

 larger in the female than in the male. The proboscis is slightly 

 protruding; labrum (obscurellus $) as in Dolichopus, strong, high at 

 the base, with a median tooth and longer backwards on each side a 

 lateral tooth; it is semitubular, the lateral teeth lying below the median; 

 hypopharynx triangular, a little shorter than or about as long as 



13* 



