354 Orthorrhapha brachycera. 



to fifth abdominal segments. Legs long and slender, the front legs 

 not short and not raptorial, without armature, but with the coxæ 

 somewhat elongated; sonietimes the second joint of the front tarsi 

 short and a httle dilated in the males; the hind metatarsus as long 

 as the second joint, without bristles. The hind coxæ have a bristle 

 on the outside; posterior femora with a preapical bristle; for the rest 

 the legs with scattered bristles, and the tibiæ with apical bristles. 

 There are two claws, two pulvilli and a distinct, narrowly lobiform 

 empodium with bristles below. Wings long and somewhat narrow, 

 generally more or less marked with dark patches, especially in the 

 male; the mediastinal vein terminating in the subcostal vein; the last 

 part of the discai vein almost straight, or more or less curved, and 

 more or less converging with the cubital vein ; posterior cross-vein 

 behind the middle, oblique, and near the margin, the last part of the 

 postical vein thus short; anal vein somewhat short. Axillary lobe 

 well developed. The discai vein has a small convexity. Squamulæ 

 with the angulary lobe well developed, with a long fringe, between 

 the hairs of wliich there are quite short, almost microscopical hairs; 

 the inner part of the squamulæ somewhat developed, with shorter hairs. 



The developmental stages are not known. 



The species of Liancalus are very beautiful flies; they occur at 

 water, especially on stones and rocks in or at rapidly flowing streams 

 and at waterfalls, on quite shady and somewhat cool piaces, and they 

 sit generally on perpendicular surfaces. 



Of the genus 5 species are known from the palæarctic region; 

 one is found in Denmark. 



1 . L. virens Scop. 



1763. Scop. Ent. carn. 342, 291 {Musca). — 1862. Schin. F. A. I, 

 229. — 1903. Kat. palåarkt. Dipt. II, 344. — DoUchopus regius Fabr. 1805. 

 Syst. Antl. 267,5. — Medeterus regius 1824. Meig. Syst. Beschr. IV, 60,1, 

 Tab. XXXV, Fig. 16 — 17. — Hydrophorus regius 1843. Zett. Dipt. Scand. 

 II, 441, 1. 



Male. Vertex and frons green. Epistoma green, a little greyish 

 pruinose. Palpi grey. Occiput greenish or æneous, greyish pruinose; 

 postocular bristles black, the hairs below white. Antennæ black, 

 short, third joint somewhat triangular, pointed. Thorax green, a little 

 greyish pruinose, dull, somewhat velvety; in the middle there are two 

 approximated, purplish stripes, which are abbreviated behind but here 

 continued by a more or less distinct middle stripe; further there is 

 at each side a purplish stripe foUowing the upper margin of the præ- 

 sutural depression and stopping at the wing-root, and between these 



