Xylota. 515 



tibiæ are much darker than in segnis is contrary to Schiner's state- 

 ment that the tibiæ are dark only on the apical part; none of tiie 

 statements I have fomid confirmed, the tibiæ in my specimens being 

 coloured mainly as in segnis. 



X.tarda is rare in Denmark, I know only seven specimens; Dyre- 

 haven (Stæger), in Jutland at Hald near Viborg (the author), and on 

 Bornholm at Allinge and in Almindingen (H. J. Hansen). My dates 

 are only ^^/e — ^^h. 



Remarks: In Verrall's Gatalogue of the Syrph. and in Kat. palåarkt. 

 Dipt. X. hifasciata apud Zett. is considered to be a synonym to 

 nemorum Fabr., but I have seen specimens from Zetterstedt's collec- 

 tion of his hifasciata, and they were tarda ; this synonymy is already 

 adopted by Wahlgren (Entom." Tidskr. XIII, 1909, 75), and Verrall has 

 the same in Brit. Fl. 



Geographical distribution : — Northern and middle Europe down 

 into Austria and Hungary; towards the north to middle Sweden, and 

 in Finland. 



3. X. ignava Panz. 



1798. Panz. Fn. Germ. LX, 4 (Syrphus). — 1822. Meig. Syst. Beschr. 

 III, 221, 13 — 1843. Zett. Dipt. Scand. II, 875, 9 et 1849. VIII, 3192,9 

 et 1859. XIII, 6039, 9. — 1862. Schin. F. A. I, 355. — 1907. Kat. palåarkt. 

 Dipt. III, 129. 



Male. Also this species is similar to segnis, but is stouter and 

 darker. Vertex broader, more triangular, bluish; frons and epistoma 

 pale yellow pruinose, the latter also with the ground colour yellow; 

 vertex with whitish hairs, frons and epistoma with only slight, pale 

 hairs just along the eye-margins. Occiput greyish white pruinose, 

 above bluish and only slightly pruinose; the hairs all white, only at 

 the upper corners some few short, black, bristly hairs. Antennæ with 

 the basal joints reddish brown or blackish, the third joint dark, blackish 

 brown or black; arista blackish. Thorax æneous black, punctate, in- 

 wards to the humeri a somewhat large, whitish pruinose spot; the 

 thorax is clothed with short, yellowish hairs, on the hind part inter- 

 mingled with some longer, paler hairs ; along the front margin, on the 

 præalar and postalar calli and across in front of scutellum are white, 

 somewhat longer hairs; above the wing-root and somewhat inwards 

 are black hairs. Scutellum with short and longer, white hairs, along 

 the margin are numerous long, but fine, not bristly hairs. Pleura slightly 

 pruinose, with longish, white hairs. Abdomen coloured as in segnis 

 but with the colour on the middle more red ; it is dull on the disc, shining 



33* 



