Dolichopodidae. 29 



also often seen on tree-trunks and palings, sometimes in great number. 

 I have once taken it (the female) with a young and very small Arachnid 

 as prey. 



Geographical distribution: — Europe down into France; towards 

 the noi'th to northern Sweden; and in Finland, but becoming rare 

 towards the north. 



2. S. nervosus Lehm. 



1822. Lehm. Programm. 1822, 40 (DoUcJtopus). — 1824. Meig. Syst. 

 Beschr. IV, 36,3 {Psilopus). — 1849. Zett. Dipt. Scand. VIII, 3106, Obs. 3, 

 {Psilopus). — 1857. Loew, Neue Beitr. V, 2,2 (Psilopus). — 1862. Schin. 

 F. A. I, 181 (Psilopus). — 1903. Kat. palåarkt. Dipt. Il, 291. 



Male. Head much broader than high; vertex and frons green, 

 yellowish grey pruinose; bristles black. Epistoma very broad, slightly 

 bluish metallic, but densely whitish grey pruinose. Palpi yellow. 

 Occiput slightly bluish, grey pruinose; postocular hairs white; the 

 lower part of occiput covered with long, white hairs. Antennæ yel- 

 low, the third joint brown at the apex, and the arista brown. Thorax 

 bright golden green, sometimes more bluish or blue, especially behind 

 and on the scutellum ; it is a little greyish or greyish yellow pruinose, 

 most densely anteriorly and on the sides. The acrostichal bristles 

 are only represented by some very small and short, pale hairs in 

 front; the bristles black; there are three supraalar bristles, the first 

 short, the second a little longer. Inwards to the humeri are some 

 longish, pale hairs. Scutellum with two black bristles, and a small 

 bristle on each side. Pleura a little metallic blue, and bluish grey 

 pruinose. Abdomen golden green, more or less coppery; it is clothed 

 with yellowish hairs, which are long at the sides, longest anteriorly; 

 at the hind margin of the segments are black bristles, on the first 

 segment they are pale, and not much marked from the long hairs. 

 Venter pale-haired. Hypopygium small; the eighth segment relatively 

 large, grey pruinose; there are very long, linear ventral lobes, they 

 are brownish, serrated at the margin, and with long, yellow hairs; 

 the outer lamellæ are united to a short lobe with hairs at the margin; 

 below this lobe lie some appendages, probably inner lamellæ, the 

 shape of which I could not see in my specimen, but which at all 

 events terminale with a pair of hooks, which are serrated or bear 

 short, stiff bristles at the ventral margin; below them are still a pair 

 of other appendages; the appendages seem thus principally to be the 

 same as in Wiedemanni. Legs yellow, posterior coxæ a little grey 

 at the base; the last tarsal joint brown or blackish. The front meta- 

 tarsus is much longer than the four foUowing joints, the fourth joint 



