Helophilus. 467 



lunules on fourth segment are narrower than in the male; the spots 

 are sometimes quite grey; second segment with a transverse, greyish 

 spot in the middle of the hind margin, third and fourth segments 

 with the hind margin greyish, triangularly produced in the middle, on 

 the third segment sometimes only a transverse triangle; fifth segment 

 quite grey or greyish yellow, or with the front margin and an ab- 

 breviated middle line from it black; all the spots are pruinose. 



Lenglh 8 — 9,5 mm. 



The types lo this species, tvvo males, are present in the collec- 

 tion of Tonder Lund and Sehestedt, and I have examined them, Also 

 muscarius Fabr. is present in the collection in two females, but these 

 are not types; it is, however, seen herefrom that lineatus is the male, 

 muscarius the female, which also is seen from Fabricius' descriptions. 



H. lineatus is common in Denmark; Ordrup Mose, Dyrehaven, 

 Bøllemosen, Lyngby Mose, Ørholm; on Lolland at Maribo, in Merrits 

 Skov and Prierskov ; on Funen at Odense ; in Jutland in Nørholm Skov 

 at Varde, at Horsens and at Hald near Viborg. My dates are ^''/s — ^*^/8. 

 It occurs in fens and at horders of water on water piants. I have 

 taken it in copula on ^Ve. 



Geographical distribution : — All Europe down into Italy ; towards 

 the north to northern Sweden, and in Finland; it occurs probably 

 also in North America {conostoma Willist.). 



11. H. vittatus Meig. 



1822. Meig. Syst. Beschr. III, 378, 1 (Mallota). — 1862. Schin. F. A. I, 

 339. — 1901. Verr. Brit. FL VIII, 548, 9, fig. 378. — 1907. Kat. palåarkt. 

 Dipt. III, 112. — 1910. Beck. Berl. ent. Zeitschr. LV, 230. 



Male. Vertex moderately broad, black; 

 frons widening below, yellow pruinose; it 

 is somewhat strongly prominent; epistoma 

 whitish pruinose, below the antennæ to the 

 central knob brownish pruinose; the knob 

 black, bare down to the mouth edge; on 

 the lower lateral part is only a small, black, 

 shining spot; jowls whitish grey pruinose. 

 Vertex black-haired , posteriorly yellow- 

 haired, frons yellow-haired ; epistoma with 

 long, white hairs; the epistoma is distinctly 

 hollowed below the antennæ, the central Fig.Vo'XUe^dofH. vittatus^. 

 knob somewhat prominent and below it 



the epistoma retreating to the front mouth edge, the lower part thus 

 not prominent and slightly descending. Occiput greyish, above yel- 



30* 



