190 Orthorrhapha brachycera. 



Female. Epistoma broad, grey. Antennæ about as in the male. 

 Abdomen generally darker than in the male, sometimes almost blackish. 



Length 3,8—4,5 mm. 



This beautiful species is easily known by the fine, steel-blue 

 colour of thorax, and also the leg-bristles are characteristic, as well 

 as the dark hind tibiæ and the yellow colour below on the first 

 antennal joint. 



H. chalyheus is not properly common in Denmark, and it has 

 only been taken at Lersøen (Stæger), in Bøllemosen and Lyngby 

 Mose (the author), but where it occurs it may be present in great 

 numbers. Stæger notes that it was numerously present in a ditch 

 at Lersøen, especially on Sium latifolium, from May to September; I 

 took it in great number in July in Bøllemosen, chiefly on Galla palu- 

 stris, and it was especially sitting and flying quite low just above the 

 water. 



Geographical distribution : — Northern and middle Europe down 

 into Austria; towards the north to southern Sweden, and in Finland. 



13. H. metallicus Stann. 



1831. Stann. Isis 1831, 262, 51 (Dolichopns). — 1842. Stæg. Krøyer's 

 Tidsskr. IV, 43, 39 (DoUchopus). — 1843. Zett. Dipt. Scand. II, 578, 68, 

 et 1855, XII, 4633, 68 (DoUchopus). —1862. Schin. F. A. I, 210.— 1903. 

 Kat. palåarkt. Dipt. II, 317. 



Male. Vertex and frons greenish, grey dusted; the ocellar tubercle 

 dark. Epistoma narrow, greyish white. Palpi dark. Occiput greenish, 

 grey pruinose; postocular bristles black. Antennæ black, short, not 

 as long as the head, third joint short triangular, shorter than broad; 

 the arista short-haired. Thorax dark greenish or somewhat æneous, 

 a little pruinose, shining; scutellum distinctly haired with short, dark 

 hairs. Pleura greenish or æneous, grey pruinose; propleura with a 

 few pale hairs and a black prothoracic bristle. Abdomen green, very 

 slightly pruinose downwards; it is clothed with short, black hairs; 

 the hindmarginal bristles are somewhat short, only long on the first 

 segment. Venter greenish, grey pruinose, with yellowish hairs which 

 are long at the base. Hypopygium shaped as in cupreus and the 

 following species ; the outer lamellæ small, roundish, darker or lighter 

 brownish yellow, with the margin darkened and along it moderately 

 long hairs ; the lamellæ are sometimes darker to blackish. Legs yellow, 

 coxæ grey with the apex yellow, front coxæ often yellowish to a 

 greater extent; tarsi darkened towards the apex, on the anterior tarsi 

 generally the last two or three joints brown or blackish, on the hind 

 tarsi the last four, or the second joint more or less yellow; hind 



