Dolichopodidae. 319 



stripe and sides. Abdomen generally with tlie front margins of the 

 segments brown. 



Length 2—2,5 mm. 



M. plumhellus is rare in Denmark, and was for the first time 

 taken in 1881; it has only been taken in Ruderhegn (the author); in 

 Jutland at Sæby, on Læsø, and on Bornholm at Hasle (H. J. Hansen); 

 in all six specimens. The dates are from July to '^^1%. It seems to 

 occur in sandy districts. 



Geographical distribution:— Northern and middle Europe down 

 into Austria and Hungary: towards the north to southern Sweden. 



2. M. seniculus Kow. 



1877. Kow. Verhandl. zool. bot. Geseli. Wien, XXVII, 46, 2. - 1903. Kat. 

 palåarkt. Dipt. II, 339. 



Vertex and frons whitish or greyish white. Epistoma silvery white. 

 Palpi whitish. Occiput greyish ; postocular bristles white. Antennæ 

 black, third joint about as long as broad, arista a little subapical, 

 more than twice as long as the antennæ. Thorax light grey or 

 yellowish grey pruinose, with a distinct brown middle stripe, and 

 with the sides more or les brown; acrostichal hairs very short; three 

 equallylong dorsocentral bristles. Scutellum with two bristles. Pleura 

 light grey; propleura with two white prothoracic bristles. Abdomen 

 dark æneous or greenish, greyish white pruinose at the sides; it is 

 clothed with short, yellow hairs, and has a little longer hindmarginal 

 bristles at the sides of the first segment. Venter dark greyish. Hypo- 

 pygium (according to Kowarz) somewhat large, the ventral lobes 

 somewhat long, straight, slightly dilated towards the apex, black; the 

 outer lamellæ triangular, yellowish, the margin black. Legs black, 

 coxæ grey pruinose; the knees reddish; hind metatarsus not half as 

 long as the second joint, excised at the base. The legs have short, 

 brownish hairs ; the bristly hairs on the anterior coxæ and the bristle 

 on the hind coxæ white; the hairs below the femora pale and in- 

 distinct; hind femora with a little longer, black hairs above in the 

 basal part; middle tibiæ with a bristle above near the base. Wings 

 brown, most towards the anterior margin ; veins blackish, the last 

 part of the discai vein straight, not much converging towards the 

 cubital vein; the last part of the postical vein about as long as or slightly 

 longer than the cross-vein. Squamulæ yellowish with a brownish 

 margin, and a yellow fringe. Halteres dirtily yellowish. 



Length fully 2 mm. 



Of this species I have only had the female, while Kowarz describes 

 only the male. so that I have taken the male characters given above 



