Baccha. 365 



Table of Species. 



1. Frons of the male grey pruinose, of the female with a 

 black stripe from vertex downwards, but stopping before 

 the antennæ, the frons here quite pruinose ; wings not 

 or shghtly brown 1 . elongata, 



— Frons of the male not pruinose, shining, in the female 

 with a black stripe from vertex to antennæ, widening 



above the antennæ; wings in the male strongly brown 2. ohscuripennis. 



1. B. elongata Fabr. 



1775. Fabr. Syst. Entom. 768, 29 {Sijrphus) et 1805. Syst. Antl. 200, 6. — 

 1822. Meig. Syst. Beschr. 111, 197, 1, Tab. XXVIII, Fig. 13. - 1843. Zett. 

 Dipt. Scand. Il, 893, 1. — 1862. Schin. F. A. 1, 324. - 1901. Verr. Brit. 

 Fl. VIII, 458, 2, fig. 321. — 1907. Kat. palåarkt. Dipt. 111, 81. — 5. scutellata 

 Meig. 1822. 1. c. 111, 198, 2, ?. — B. sphegina Meig. 1822. 1. c. III, 198, 3. 



— B. tabida Meig. 1822. 1. c. III, 199, 5. — B. abbreviata Meig. 1822. 1. c. 

 III, 200, 6. — B. nigripennis Meig. 1822. 1. c. III. 200, 7, c?. — 1862. 

 Schin. F. A. I, 324. — B. vitripennis Meig. 1822. 1. c. III, 200, 8. ?. — 

 B. Klugii Meig. 1830. 1. c. VI, 349, 9, c^. 



Male. Vertex æneous, a little pruinose; frons greyish or whitish 

 pruinose, a little shining above the antennæ ; epistoma likevvise grey 

 pruinose, the central knob shining. Jowls greyish black, but the side 

 mouth edges more or less yellowish. Vertex, frons and epistoma all 

 white haired. Occiput bluish, grey pruinose, with a single row of 

 longish, whitish hairs which are directed backwards. Antennæ yellow 

 or more or less brown to blackish brown ; arista longer than the 

 antennæ, dark, thickened just at the base. Thorax æneous or greenish 

 æneous, sometimes bluish, brightly shining, the humeri somewhat 

 brownish or dark yellowish ; thorax is clothed with short, whitish 

 hairs. Scutellum with quite short, whitish hairs. Pleura slightly 

 pruinose, with quite short, pale pubescence. Abdomen æneous black 

 or dark æneous brown, shining, first segment bluish ; at the front 

 margins of third and fourth segments a larger or smaller, yellow band, 

 sometimes the first, or both bands hicised in the middle; at the front 

 corners of the fifth segment may be yellow spots, but they are often 

 wanting, and also the band on third segment may be quite small, 

 divided into spots, or, but more rarely, quite wanting; the bands are 

 sometimes somewhat hoary. Abdomen is clothed with short, in- 

 conspicuous hairs, mainly following the ground colour, but they are 

 pale at the base and at the sides and here long on the whole second 

 and on the front half of third segment; at the sides of the first seg- 

 ment they are longest. Venter coloured chiefly as the dorsum, with 

 short mainly dark hairs. Legs yellow, posterior coxæ more or less 

 darkened to blackish, and hind tarsi more or less darkened; hind 



