320 Orthorrhapha biachycera. 



from him. I do not doubt the determination, as Kowarz's description 

 agrees in every respeet, only the abdomen is in my specimen more 

 greyish æneous than green. 



M. seniculus is very rare in Denraaric, \ve have only one specimen, 

 a female, taken in Jutland at Jerup north of Frederiicshavn on ^^h 1908 

 (Th. Mortensen). 



Geographical distribution: — Besides from Denmark the species is 

 only known from Poland. 



3. M. micaceus Loew. 



1857. Loew, Neue Beitr. V, 55. — 1862. Schin. F. A. I, 238. — 

 1877. Kow. Verhandl. zool. bot. Gesell. Wien, XXVII, 47, 3, Taf. II, Fig. 19—20. 

 — 1903. Kat. palåarkt. Dipt. II, 338. — Hydrophorus apicalis Zett. 1843. 

 Dipt. Scand. II, 452, 12, p. p, var. b, et 1849. VIII, 3055, 12, et 1855. 

 XII, 4616, 12. — Hydrophorus jaculus Fall. 1823. Dipt. Suec. Dol. 5, 7. 

 p. p. var. /?. 



Male. Vertex and frons brown. Epistoma brown above, below 

 blackish green, a little shining, and a little greyish pruinose, especially 

 at the sides. Palpi black. Occiput greenish, greyish pruinose; posto- 

 cular bristles whitish. Antennæ black, third joint short, roundish; 

 arista almost apical, long. Thorax brown or somewhat coppery 

 pruinose, with three, often indistinct, brown stripes, the median most 

 distinct; acrostichal bristles very short; three equally long dorsocentral 

 bristles; only two supraalar bristles, Scutellum with two bristles. 

 Pleura brownish grey or grey pruinose, the æneous ground colour 

 somewhat visible; propleura with two or three whitish prothoracic 

 bristles. Abdomen æneous or sometimes more greenish, a little greyish 

 pruinose; it is clothed with short, yellow hairs, and has slightly longer 

 hind marginal bristles at the sides of the fh'st segment. Hypopygium 

 somewhat large, black or slightly greenish ; the eighth segment greyish 

 pruinose; tlie ventral lobes somewhat long, straight, brownish; the 

 outer lamellæ shorter, somewhat triangular, likewise brownish. Legs 

 with the coxæ black, greyish pruinose; femora blackish, often greenish 

 shining, with the apical part yellowish to a greater or smaller extent ; 

 tibiæ yellowish or brownish yellow, generally darker at the apex; 

 tarsi brown or blackish brown, sometimes paler at the base; some- 

 times the legs are darker; hind metatarsus not half as long as the 

 second joint, strongly excised at the base below, and with a small 

 tooth. The legs have short, brownish or yellowish hairs; the bristly 

 hairs on the anterior coxæ and the bristle on the hind coxæ whitish; 

 the hairs below the femora pale and very short; middle tibiæ with 

 one or a pair of bristles near the base, hind tibiæ here with a very 



