Dolichopodidae. 253 



pair of forwards curved hairs. The eyes are large, oval or almost 

 semicircular ; in the living specimens they are dark metallic green 

 with reddish or purplish reflexes, or quite purplish; they are densely 

 hairy. The facets are in the males slightly enlarged on the front side. 

 The eyes are separated, the epistoma is narrow or very narrow in 

 the males, broad in the females. The postoeular bristles form a 

 single row above, but below the whole occiput is densely covered 

 with long or longish hairs. The antennæ are placed near to each 

 other, soinewhat high above the middle; they ai"e longer or shorter, 

 longest in the males; it is especially the third joint which varies 

 in length, and in the males it is more or less oval or longer and 

 lancet-shaped, in the females it is generally more or less short oval 

 or triangular, rarely longer; the basal joint is cylindrical or slightly 

 obconical, the second short, not overlapping the third, The arista is 

 apical, it has sometimes (in non Danish species) a little dilatation at 

 the apex; it is in the male shorter or longer than the antenna itself, 

 in the female longer ; its first joint is quite short. The basal antennal 

 joint has no hairs above, the second has a circlet of longer or shorter 

 bristles at the apex, longest above; the third joint is very short- 

 haired or almost microscopically haired, so that it may be apparently 

 bare^; the arista very shortly pubescent, almost bare. The epistoma 

 is, as said, much broader in the female than in the male; the clypeus 

 is in the male slightly marked off, in the female it is somewhat large, 

 distinctly separated from the epistoma by a transverse, elevated keel; 

 it has in this sex a rounded lower margin and is a little arched, and 

 it reaches almost as far down as the lower margin of the eyes, while 

 it is shorter in the male. The proboscis, palpi and mouth aperture 

 are considerably larger in the female than in the male; the proboscis 

 is also rather protruding in the female, while it is not or almost not 

 protruding in the male. Labrum {crassipes $) strong, somewhat long, 

 high at the base, with a longer median tooth and two shorter lateral 

 teeth; it is strongly semitubular, the margins almost touching below, 

 and hence the lateral teeth turned downwards; the margins are 

 distinctly haired; hypopharynx a little shorter than labrum, elongated 

 triangular, curved a little downwards at the apex, and with a distinct 

 salivary duet; maxillary palpi large (much smaller in the male) some- 

 what oval, squamiform and hairy. The labium is thick, it has the 



1) Loew says (Neue Beitr. V, 1857, 35) that all species of Porphyrops, except 

 nasutus and crassipes, have the third antennal joint bare below, but this is 

 not correct; the joint is haired all over, but very short, and I am unable to 

 trace any difference in this respect between nasutus and crassipes and the 

 other species. 



