Xysta. 105 



Antennæ black, a little pale on second joint, short, third joint slightly 

 longer than second; arista short pubescent. Palpi yellow. Thorax 

 black, grey pruinose, with three somewhat broad black stripes, the 

 median somewhat abbreviated behind. Thorax is densely black- 

 haired and has two or three præ'sutural dorsocentrals; a posthumeral 

 and an intraalar bristle present. Abdomen brownish, all greyish or 

 brownish grey pruinose; second segment dark in certain lights; it 

 is densely black-haired, with small marginal bristles, a pair on second 

 and third segment and a row on fourth and fifth segment; on second 

 segment they may sometimes be very small. Upper forceps large, 

 compressed and beak-shaped, carinate on dorsal side; arms of lower 

 forceps smaller, broad at base, styliform outwards. Legs black, 

 moderately bristled. Wings a little brownish tinged, most towards 

 anterior margin, yellowish at base; veins brown; first posterior cell 

 narrowly open or just closed at margin, ending quite near apex of 

 wing; angle on discai vein rounded. Squamulæ dirty whitish or 

 yellowish. H alteres yellow. 



Female. Similar; frons quite narrow with the orbits touching 

 above. Thorax more extensively grey than in the male, with four 

 black stripes, the median narrow and often a narrow middle stripe 

 between them; also the lateral stripes narrow. Middle tibiæ with 

 ventral bristle. 



Length 7 — 8 mm. 



X. cana is rare in Denmark, and has only been taken on Lolland 

 at Maribo (Schlick); it was taken in June. Stein mentions a specimen 

 from Denmark. 



Geographical distribution: — Northern and middle Europe 

 down into France; towards the north to southern Sweden, and in 

 Finland. 



7. Gymnosoma Meig. 



Medium sized, broad species of black and yellow colour. Head 

 broader than thorax, somewhat convex behind, much higher than 

 long. Frons in male not as broad as the eye, in female broader than 

 in male, a little protruding. Jowls fully one third of the height of the 

 eye. Only ocellar bristles present; orbits more or less hairy and in 

 female the hairs somewhat strong along the eye-margin, indicating 

 orbitals. Postocellar and occipital bristles distinct. Behind postocular 

 bristles some few black hairs above. Frontal bristles reaching to 

 insertion of antennæ, all crossing in both sexes. Cheeks bare. Vibrissæ 



