Syrphus. 297 



Squamulæ pale yellow with a yellow margin and fringe. Halteres 

 yeliow. 



Female, Vertex somewhat narrow, the frons widening down- 

 wards, it is yellovvish pruinose at the sides leaving in the middle a 

 blacli, elongated triangle, stretching from vertex to antennæ; the hairs 

 blaek. No black hairs above at the eye-margin. Abdominal bands 

 as in the male, slightly narrower. 



Length 10—13,6 mm. 



S. grossulariae is by no means common in Denmark, or at all 

 events rather local, and hitherto only taken on Sealand ; Ordrup Mose 

 (Stæger), Frerslev Hegn (the author), Nyrup Hegn, Tisvilde (Klocker, 

 the author). My dates are ^h—Vs. It occurs in and at v^oods, I have 

 taken it on flovvers of Spiræa and Sambucus. 



Geographical distribution: — Northern and middle Europe down 

 into Austria, Bohemia and Styria, and also recorded from Italy; 

 towards the north to middle Sweden, and in Finland. It occurs also 

 in North America {Lesueurii, conjungens). 



13. S. diaphanus Zett. 



1843. Zett. Dipt. Scand. [I, 711, 12 {Scaeva). — 1862. Schin. F. A. I, 

 310. — 1901. Verr. Brit. FJ. VIII, 364, 12. — 1907. Kat. palåarkt. Dipt. 

 III, 64. 



Male. Frons yellow and yellow pruinose, shining above the 

 antennæ; epistoma yellow, whitish pruinose at the sides and the 

 jowls likewise. Vertex with brown hairs; frons yellow-haired with 

 some few black hairs intermingled; epistoma with yellow hairs. Occiput 

 greyish white pruinose below, yellowish above; the hairs likewise 

 whitish below, yellowish upwards; above only very few dark, over- 

 hanging hairs. Eyes bare. Antennæ black, a little pale at the ex- 

 treme base, and very slightly so at the base beneath the third joint; 

 arista about as long as the antennæ. Thorax æneous, dull, a little 

 shining behind, with indications of two stripes in front; it is some- 

 what yellow at the sides and on the postalar calli ; it is clothed with 

 yellow hairs. Scutellum yellow, with long, yellow hairs. Pleura 

 yellow-liaired. Abdomen is somewhat narrow, dull blaek, a little 

 shining at the apex; it has extensive yellow markings consisting of a 

 pair of basal spots and two bands, and the whole apex is yellow; 

 the basal spots are large, triangular, lying on the middle of the seg- 

 ments but sloping upwards at the sides and here reaching the front 

 margin and going over the sides; the second and third bands lie close 

 to the front margins; they are broad, occupying about two thirds of the 



