Xylota. 517 



4. X. lenta Mei^ 



1822. Meig. Syst. Beschr. III, 222, 15. — 1843. Zett. Dipt. Scand. II, 

 877, 11. — 1862. Schin. F. A. I, 355. — 1901. Verr. Brit. Fl. VIII, 601,3, 

 fig. 411. — 1907. Kat. palåarkt. Dipt. III, 129. — Milesia pigm Fall. p.p. 

 (nec Fabr.) 1816. Dipt. Suec. Syrph. 11,7. 



Male. Agaln this species is somewhat similar to segnis, but it is 

 larger, much broader and stronger and of darker colour. Vertex black, 

 elongated, eye-suture somewhat short; frons and epistoma whitish 

 pruinose, the frons ratiier prominent and also the mouth edge pro- 

 minent; vertex with pale hairs intermingled with some black ones; 

 frons quite without hairs, and epistoma with only shglit, pale hairs at 

 the sides of the antennæ and just along the eye-margins. Occiput 

 whitish pruinose on the lower half, black and shining above ; the hairs 

 white, above almost all black. Antennæ with the basal joints black, 

 the third joint somewhat large, dark brown to blackish; arista blackish, 

 brownish at the base. Thorax black, shining, fmely punctate, inwards 

 to the humeri a whitish pruinose spot; thorax is clothed with short, 

 whitish yellow and partly black hairs, and on the whole disc with 

 longer, erect, partly pale, partly black hairs ; above the wing-root some 

 black hairs and on the postalar calli some longer, yellow hairs. 

 Scutellum with longer and shorter, pale hairs, the long hairs at the 

 margin not bristly. Pleura with somewhat long, not dense, white 

 hairs. Abdomen coloured about as in segnis; first segment black, 

 second and third red ; the second with only the extreme front margin 

 black not reaching the sides, and with a black triangle in the middle; 

 the third segment quite red without black hind margin ; fourth seg- 

 ment black; abdomen all shining; it is clothed with not quite short 

 hairs, which follow the ground colour but are pale on first segment; 

 they are somewhat long on fourth segment, on the other segments 

 they are short along the middle, increasing in length towards the sides 

 and especially long towards the basal corners. Genitalia with longish, 

 black hairs. Venter coloured as dorsum, with long, pale, on fourth 

 segment black hairs, on this latter segment they are shorter except 

 at the end. Legs all black; hind trochanters simple, hind femora 

 rather thickened, thickest near the apex and somewhat abruptly 

 attenuated at the end; they have for the greater part only bristles 

 below and it is only on the apical third that there are stronger, short 

 spines, not distinctly arranged in rows; hind tibiæ somewhat com- 

 pressed and evenly curved, they are canaliculate behind in the basal 

 half; legs somewhat long-haired, also the tibiæ with relatively long 

 pubescence; anterior femora whitish-haired, hind femora with white 



