Helophilus. 461 



is seen by Frey and Verrall. Had the male genitalia been described 

 they should no doubt have given good characters. — In all three 

 species the pruinose spots on abdomen vary from yellow to grey. 



8. H. lunulatus Meig. 



1822. Meig. Syst. Beschr. III, 370, 2, Tab. XXXII, Fig. 9. — 1843. Zett. 

 Dipt. Scand. II, 681, 5 et 1849. VIII, 3123, 5. — 1862. Schin. F. A. I, 

 340. — 1901. Verr. Brit. Fl. VIII, 540, 6, figs. 372-373. — 1907. Kat. 

 palåarkt. Dipt. III, 110. — 1910. Beck. Berl. ent. Zeitschr. LV, 229. 



Male. Vertex brownish black pruinose, frons yellowish pruinose, 

 sometimes darker or greyish towards the vertex; epistoma whitish 

 yellow pruinose, v^ithout any bare stripe or spot, the lower side parts 

 blackish, shining; jowls grey pruinose. Vertex black-haired, posteriorly 

 with yellow hairs, frons yellow-haired; epistoma with long, yellow 

 hairs; the epistoma is a little hoUowed below the antennæ, the knob 

 or lower part somewhat protruding, more than the antennal pro- 

 minence, and somewhat but not much descending. Occiput greyish 

 yellow or greyish brown pruinose, the hairs whitish below, yellow 

 above, and there are no black hairs at the eye-margin. Antennæ 

 orange, arista darker. Thorax black, dull, with two narrow or broader, 

 greyish yellow longitudinal stripes, and the side margin broadly of 

 the same colour; the middle stripes may sometimes be rather narrow, 

 especially in front, and they are here connected with an inwards pro- 

 longed part from the side stripes. Thorax is clothed with yellow hairs. 

 Scutellum yellowish, the basal corners blackish; it is yellow-haired. 

 Pleura yellowish grey pruinose with long, pale hairs. Abdomen linear, 

 dull black, with the hind margins of second and third segments 

 shining; the first segment may be more or less greyish; the second 

 segment is greyish or greyish yellow along the side from the base to 

 near the hind margin, and from the end sending a prolongation in on 

 the middle of the disc, but the spots broadly separated in the middle ; 

 the third segment with somewhat similar spots but also narrowly 

 greyish yellow at the side margin down to the hind margin ; the spots 

 are almost shaped as iron-angles with one leg along the margin, the 

 other stretching in on the disc; on the spots on second segment the 

 leg along the side margin longest, on the other spots short; the spots 

 are pruinose and may be more or less yellow at the base and at the 

 side; the fourth segment is almost quite yellowish grey pruinose, with 

 a black, triangular middle spot, but sometimes the black is more ex- 

 tended so that the pale colour forms side spots about as on third 

 segment and a triangular spot at the hind margin; the hind margins 



