322 Orthorrhapha brachycera, 



metatarsus more than half as long as the next joint, not excised at 

 the base. The bristly hairs on the anterior coxæ and the bristle on 

 the hind coxæ dark brown or blackish; for the rest the legs with 

 short, pale or whitish hairs, which are specially conspicuous on tibiæ 

 and tarsi; the hairs below the femora indistinct; middle and hind 

 tibiæ without bristles near the base. Wings hyaline or slightly 

 yellowish; veins brown, the last part of the discai vein a little curved, 

 somewhat converging towards the cubital vein; the last part of the 

 postical vein about one and a half times as long as the cross-vein. 

 Squamulæ brownish yellow, with a brown margin and a yellow fringe. 

 Balteres yellowish or brownish. 



Female. Quite similar to the male. 



Length 1,7 — 2 mm. 



M. muralis is rare in Denmark, only five specimens have been 

 taken on Fimen at Odense (H. J. Hansen); I know no time for its 

 capture. 



Geographical distribution : — Europe down into Italy ; towards the 

 north to northern Scandinavia, and in Finland. 



5. M. apicalis Zett. 



1843. Zett. Dipt. Scand. II, 452, 12, $ (excl. var. b) (Hydrophorus). 

 — 1857. Loew, Neue Beitr. V, 53. — 1877. Kow. Verhandl. zool. bot. 

 Geseli. Wien, XXVII, 54, 10. — 1903. Kat. palåarkt. Dipt. II, 337. 



Vertex and frons greenish, greyish pruinose. Epistoma metallic 

 green, a little pruinose above, darker and more shining below. Palpi 

 black. Occiput greenish, grey pruinose; postocular bristles whitish or 

 yellow, black above. Antennæ black, third joint short; arista sub- 

 apical, long. Thorax metallic green or bluish green, somewhat greyish 

 or brownish grey pruinose; acrostichal bristles distinct; the dorso- 

 central rows formed of three to five small bristles in front and three 

 or four longer bristles behind. Scutellum with four bristles. Pleura 

 greenish or bluish green, a little greyish pruinose; propleura with two 

 or three pale or darker prothoracic bristles. Abdomen green or dark 

 green, almost not pruinose; it is clothed with short, yellow or darker 

 to blackish hairs, which are very slightly longer at the sides of the 

 first segment. Venter greenish, grey pruinose. Legs with the femora, 

 especially the hind femora, robust, and the latter shining on the 

 posterior side; the legs are black, the knees yellowish, sometimes to 

 so great an extent that a larger apical part of the femora and the 

 basal part of the tibiæ are pale; middle metatarsus sometimes a little 

 pale at the base; hind metatarsus somewhat shorter than the second 

 joint. The legs have short, chiefly yellowish or brownish hairs; the 



