406 Syrphidae. 



3. V. inanis L. 



1758. Linn. Syst. Nat. X, 595 et 1767. XII, 2, 989, 61 et 1761. Fn. 

 Suec. 1825 (Musca). — 1775. Fabr. Syst. Entom. 773, 1 et 1781. Spec. Ins. 

 II, 435. 1 (3Iusca). — 1816. Fall. Dipt. Suec. Syrph. 19, 6 {Si/rphus). — 

 1822. Meig. Syst. Beschr. III, 407, 6. — 1843. Zett. Dipt. Scand. II, 652, 5. 

 — 1862. Schin. F. A. I, 330. — 1901. Verr. Brit. Fl. VIII, 486, 2. — 1907. 

 Kat. palåarkt. Dipt. III, 92. — Syrphus micans Fabr. 1794. Ent. Syst. IV, 

 278, 2 et 1805. Syst. Antl. 224, 2. 



Male. Vertex yellow, brownish at the ocelli; frons and epistoma 

 yellow, of the same shape as in pellucens but more deseending; the 

 sides of epistoma have a brown stripe from the eye downwards ; jowls 

 yellow or brownish with a dark spot at the lower eye-corner. Vertex 

 and frons with the hairs varying from black to yellow; epistoma yel- 

 low-haired on the front side. Eyes with long, brown hairs, wanting 

 only on a small hind part below. Occiput light grey pruinose, with 

 yellow hairs, long below. Antennæ yellow or orange, third joint more 

 than twice as long as broad; arista dark towards the apex, plumpse 

 with long, black hairs, longest above. Thorax black or brownish black, 

 shining, humeri and sides broadly yellow, and generally also a brownish 

 spot in front of scutellum and a narrow, brownish stripe on each side 

 inwards to the side margin; thorax with not long hairs, which are 

 yellow with a few black in front, brown or black behind; there 

 are strong, black notopleural, supraalar and postalar bristles, and a 

 transverse row at the hind margin. Scutellum yellow, dull, with 

 blackish hairs and strong marginal bristles. Pleura brownish, darker 

 below, with long, yellow hairs and black bristles at the upper corner 

 of mesopleura and above on pteropleura. Abdomen less short and 

 broad than in the foregoing species; it is yellow, dull, with the first 

 segment and the hind margins of the second and third segments black 

 or brownish black; the second segment has a similarly coloured middle 

 line, sometimes also present behind on third segment; the fourth seg- 

 ment may be narrowly black at the hind margin. Genitalia black. 

 Abdomen clothed with short hairs mainly foUowing the ground colour, 

 but the black hairs on the black hind margins stretching a little in 

 on the yellow part, and fourth segment more or less black-haired just 

 at the hind margin. Venter yellow, first segment black, third with a 

 broad, blackish hind margin and fourth likewise but the dark colour 

 produced triangularly forwards; the hairs on venter longish and pale 

 on the basal part, for the rest short and mainly black. Legs reddish 

 yellow, femora with the basal half or more black, the black part 

 broadest on hind femora, the dark colour stretching longest towards 

 the apex above; hind tibiæ sometimes with a faint, dark ring in the 



