Helophilus. 465 



10. H. lineatus Fabr. 



1787. Fabr. Mantis. Ins. 357, 2 et 1794. Ent. Syst. IV, 375, 2 et 1805. 

 Syst. Antl. 223, 2 ^ (Rhingia). — 1817. Fall. Dipt. Suec. Syrph. 31, 28 

 (Syrphus). — 1822. Meig. Syst. Beschr. III, 369, 1, Tab. XXXII, Fig. 7. — 

 1843. Zett. Dipt. Scand. II, 682, 7 et 1849. VIII, 3124, 7 et 1859. XIII, 

 5085, 7. — 1862. Schin. F. A. I, 341. — 1901. Verr. Brit. Fl. VIII, 545, 8, 

 figs. 376—377. — 1907. Kat. palåarkt. Dipt. III, 111. — 1910. Beck. Berl. 

 ent. Zeitschr. LV, 229. — Rhingia muscariaFa.hr. 1794. Ent. Syst. IV, 375 

 et 1805. Syst. Antl. 223, 3, ?. 



Male. Vertex black, frons yellowish brown pruinose, the border 

 between the colours indefinite; epistoma brownish yellow or dark 

 yellow pruinose, the lower lateral parts black, shining but pruinose 

 at the margin; jowls yellowish pruinose. Vertex and frons black- 

 haired or the latter more or less to quite yellow-haired; epistoma 

 with long, scattered, yellow hairs but only on the basal side parts, 

 the rest bare; sometimes the hairs are mixed with black hairs. The 

 epistoma is of a curious shape, it is a little hollowed below the an- 

 tennæ and then the lower part is produced much forwards as a some- 

 what pointed snout, but not very descending. Occiput yellow or 

 greyish yellow pruinose, with yellow hairs, darkest above, and here 

 generally some black hairs, especially towards the sides; there may 

 be a faint dark spot a each side. Antennæ with the basal joints 

 blackish, the third brownish red; arista dark brown. Thorax black, 

 dull, with two narrow stripes and the sides yellowish ; the stripes 

 and the pale sides are connected at the front and hind margins; 

 thorax is clothed with longish, yellow hairs. Scutellum brownish yellow 

 with the base and basal corners blackish; it has yellow hairs with 

 some few black on the disc. Pleura greyish yellow pruinose, with 

 yellow hairs. Abdomen dull black, second segment with somewhat 

 triangular, yellow side spots, the spots stretch at the sides from the 

 base to somewhat near the hind margin and are produced inwards 

 with the front margin concave, the hind margin straight but sloping 

 a little forwards and the inner end blunt; the inner end is covered 

 by a larger or quite small, whitish, grey or greyish yellow pruinose 

 spot; the third segment has yellow basal corner spots with a grey 

 or greyish yellow pruinose spot produced inwards from the lower 

 inner corner; at the apical corners of the segment are small, yellowish 

 spots, and in the rniddle of the hind margin a small greyish, pruinose 

 triangle; the fourth segment has the sides and hind margin greyish 

 or yellowish pruinose, and from the side a shallow lunule stretching 

 inwards nearest the front margin; the pale hind margin is triangularly 

 produced in the middle. The spots may vary somewhat in size, and 



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