350 Orthorrhapha brachycera, 



2 — 3. — Hydrophorus bipunctatus 1838. Zett. Ins. Lapp. 700, 2, p. p., et 

 1843. Dipt. Scand. II, 442, 2, p.p. 



Male. Head higher than broad; vertex and frons dark brown, a 

 little greenish at the sides. Epistoma broad, white, just below the 

 antennæ a little brown, and the green ground colour may here be 

 slightly seen. Palpi blackish. Occiput æneous, brownish pruinose above, 

 grey below; postocular bristles blaek, the hairs below yellow, No 

 jowls. Antennæ black, third joint roundish, pointed in front; the 

 arista longer than the antennæ. Thorax dark olive or blackish, with 

 greenish or dark violet reflex, shining; it is dark brown pruinose 

 along the margin; on the middle there is a very narrow, brown 

 pruinose line; dorsocentral bristles not short, numerous. Scutellum 

 with four bristles. Pleura a little greenish or æneous, grey pruinose, 

 brown above; propleura with pale hairs and a black prothoracic 

 bristle. Abdomen short, obliquely truncate at the end; it is green or 

 æneous, grey pruinose at the sides, clothed with short hairs, which 

 are black above, longer and pale at the sides in front. Venter greyish, 

 with pale hairs. Hypopygium hidden, the outer lamellæ short, blackish. 

 Legs green, coxæ grey pruinose; feniora very slightly pruinose, tarsi 

 blackish; the legs have short, chiefly black hairs, and some pale 

 pubescence below the tibiæ towards the end and below the tarsi; the 

 coxæ are blackish-haired, the front coxæ more brownish, and with 

 some black bristles; front femora not much thickened, with a short 

 row of rather thin spines or bristles in the middle on the antero- 

 ventral side, and besides with somewhat dense hairs; before the apex 

 there are four slightly stronger spines, two of which are curved, and 

 still more apically a little tubercle; the front tibiæ have a dense row 

 of short spines, decreasing in size towards the base, and at the base 

 there is a small tubercle; the posterior femora and tibiæ have various 

 scattered bristles. Wings a little greyish tinged, with two spots placed 

 as in bipunctatus, but often smaller and less conspicuous; veins black, 

 the last part of the discai vein very slightly curved, and slightly con- 

 verging towards the cubital vein. Squamulæ yellow, with a yellowish 

 fringe. Balteres yellow, with the knob brown or blackish, but with 

 the inner margin yellow. 



Female. Epistoma very slightly broader above than in the male, 

 brown, the æneous green ground colour a little observable below the 

 antennæ. Front femora and tibiæ simple and unarmed. Wings more 

 tinged on the anterior half. 



Length 4 — 5 mm. 



H. horealis is rare in Denmark, we have only four specimens, 

 three from earlier time, without locality given, and one taken in 



