Dolichopodidae. 389 



tinged; veins yellow; posterior cross-vein much before the middle of 

 the wing, and before the middle of the postical vein. Squamulæ pale 

 yellow, with a whitish fringe. Halteres pale yellow. 



Female. Epistoma not broader than in the male. Abdonien 

 yellow, with the apex green. 



Length 1,5 — 1,8 mm. 



C. concinnus is very rare in Denmark, and seems to be rarer 

 than the preceding, though taken in more localities; Dyrehaven 

 (Stæger, type-specimens) ; on Funen at Odense, and in Jutland at 

 Hald near Viborg (H, J. Hansen); in all six specimens. The dates are 

 in August. Stæger took it on Corylus. As Zetterstedt says: "Stæger 

 in litteris" the name is originally due to Stæger, who tlrst detected 

 the species. 



Geographical distribution: — Northern and middle Europe down 

 into Hungary; towards the north to southern Sweden. The species 

 is everywhere generally rare; Verrall says (Entom. Month. Mag. XVI, 

 1905, 248) that beyond a capture in England in 1904, when it was 

 taken in abundance, he could trace only about five specimens from 

 Scandinavia and one from Hungary; there were however some more 

 known; in Stæger's coUection are four specimens, and Zetterstedt 

 mentions in Vol. II four specimens, and in Vol. XIII he says that it 

 had further been taken "rarissime"; finally Lichtwardt mentions 

 (Zeitschr. fur Hymenopt. und Dipt. II, 1902, 286) besides the specimen 

 from Hungary three from near Berlin. 



30. XantlioclilOFUS Loew. 



Species of small size, more or less yellow and slightly metallic in 

 colour. Head about as broad as thorax, a little broader than high, 

 slightly arched behind. Vertex slightly excavated, ocellar tubercle a 

 little prominent. Frons broad, a little narrower towards the antennæ. 

 There are ocellar, outer vertical, and somewhat large postvertical 

 bristles, besides a pair of small hairs on the ocellar tubercle. Eyes 

 large, oval, slightly, almost microscopically hairy ; in the living specimens 

 they are bright green, with a little reddish reflexes. The facets are 

 of the same size. The eyes are separated in both sexes, a little more 

 in the female than in the male, and in the latter sex the eyes are 

 most approximated below. The postocular bristles form a single row, 

 but besides there are a number of bristles on the lower part of the 

 occiput. Antennæ inserted near to each other, slightly above the 

 middle, in the female almost in the middle; they are short, of the 

 same shape in both sexes; the third joint is shorter than broad, 



