224 Syrphidae. 



1. P. granditarsa Forst. 



1781, Forst. Nov. sp. Ins. Geni. 1, 99 (Musca). — 1901. Verr. Brit. 

 Fl. VIII, 300, 1, figs. 257— 259. — 1907. Kat. palåarkt. Dipt. III, 47. — 

 Sijrphus oci/mi Fabr. 1794, Ent. Syst. IV, 309, 114 et (Scaeva) 1805. Syst. 

 Antl, 252,^8, — 1822. Meig. Syst. Beschr. III, 337, 93, ?. — Scaeva 

 ocymi 1843. Zett. Dipt. Scand. II, 754, 57 et 1849. VIII, 3152, 57. — 1843. 

 Stæg. Naturh, Tidsskr. IV, 326. — P. ocymi 1862. Schin. F, A. I, 297, - 

 Syrphus lobatus Meig. 1822. 1. c. III, 336, 92 et 1830. VI, 353, c?. 



Male. Frons and epistoma black or bliiish black, shining; frons 

 with velvet black dust above and epistoma a little greyish pruinose 

 towards the sides and below. Vertex and frons black-haired; epi- 

 stoma with scattered, erect, black hairs at the sides. Frons somevvhat 

 protruding; central knob somewhat pointed and more protruding than 

 the mouth edge. Occiput bluish black, greyish pruinose at the eye- 

 margin, the hairs white, above more yellowish. Antennæ black, not 

 small and with the third joint somewhat large, about square with the 

 upper end corner somewhat angular; arista shorter than the antennæ, 

 indistinctly pubescent, Thorax æneous black, somewhat shining, with 

 three abbreviated duU black stripes; it is clothed with short, pale yel- 

 low hairs, longest behind and on scutellum, especially at the margin. 

 Pleura with a little longer, yellowish hairs. Abdomen orange or yel- 

 lowish red, dull, first and fifth segment æneous, shining; the basal 

 third of second and the apical half or more of fourth segment black; 

 the black colour at both ends generally prolonged a little triangularly 

 in the middle; sometimes the apical corners of second and third seg- 

 ments a little black, and the side margin of second segment is æneous; 

 the fifth segment may be a little reddish at the basal corners, Ab- 

 domen is clothed with short hairs, longer at the basal part of the side 

 margin, especially at the basal corners; in colour the hairs follow the 

 ground colour. Venter coloured about as dorsum, clothed with short, 

 pale hairs, at little longer at the base. Legs black, about the apical 

 third of front femora and basal half of tibiæ yellow, and similarly on 

 the middle legs but the yellow colour less extended; hind legs with 

 the extreme apex of femora and basal part of tibiæ yellowish, The 

 anterior tibiæ are a little dilated after the base and slightly excised 

 below near the tip; front metatarsus curiously shaped; it is almost 

 as long as the following joints, its anterior margin is in the lower 

 half prolonged inwards and curved downwards into a long, triangular 

 process which is short-haired at the margin and apex ; the other joints 

 only slightly broad; the middle tarsus is still more curiously shaped. 

 the basal joint is very broad with the anterior margin prolonged into 

 a long, tongue-shaped, but inwards curved process, the three next 



