Syrphus. 325 



Length 8 — 10,5 mm, 



This species is similar to the two preceding, especially to cinc- 

 tellus as it has, like it, the antennæ partly black and scutellum 

 black-haired, but it will always be distinguished by the shape of the 

 abdominal spots, which have the posterior outer corner nearest the 

 side margin, and especially the shape of the basal spots is characteristic. 



S. auricollis is not rare in Denmark; Copenhagen in gardens, 

 Charlottenlund, Ordrup Mose, Ermelund, Dyrehaven, Lyngby Mose, 

 Hørsholm, Sorø, Tisvilde, Faxe Ladeplads; on Langeland at Lohals; 

 on Funen, and in Jutland at Rebbild near Skørping. My dates are 

 ^/v— ^^/lo, it is thus a late occurring species; I have taken it newly 

 emerged on ^h. It occurs in woods and not rarely in gardens; al- 

 most all Danish specimens have the abdominal spots separated and 

 belong thus to the var. maculicornis. — Verrall records the species as 

 bred from larvæ feeding on Aphis pruni; further he notes that this 

 species seems to be the main species stored up by Crahro vams, as 

 it occurs in masses in its burrovvs, all with their heads in one direc- 

 tion, while a pair of halteatns occurred in company. 



Geographical distribution: — Europe down into Spain and Italy; 

 towards the north to middle Sweden, and in Finland; further it is 

 recorded from Madeira and the Canaries. 



26. S. euchromus Kow. 



1885. Kow. Wien. ent. Zeitg. IV, 167. — 1901. Verr. Brit. Fl. VIII, 400, 

 26. — 1907. Kat. palaarkt. Dipt. III, 64. — Scaeva decora Zett. (nec Meig.) 

 1843. Dipt. Scand. II. 738, 40 et 1959. XIII, 5098, 40. 



Male. Head broader than high ; vertex somewhat large, triangular, 

 not elongate. Frons broad, blackish, a little æneous, greyish pruinose 

 but shining just above the antennæ. Epistoma rather broad, almost 

 half as broad as the head; it is dark yellow, somewhat pruinose. the 

 central knob shining; the mouth edge, the lower side parts and the 

 jowls black, the latter large, a little descending. Vertex and frons 

 black-haired; epistoma mainly black-haired but with some pale hairs 

 below. Occiput grey pruinose, the hairs whitish below, dark yellow 

 upwards, above a row of black hairs overhanging the eyes. Eyes 

 practically bare. Antennæ reddish yellow, third joint oval ; arista short 

 and rather thick, shorter than the antennæ, slightly pubescent. Thorax 

 dark æneous or a little bluish, shining; it is clothed with yellow or 

 dark yellow hairs, longest behind. Scutellum dark brownish yellow, 

 distinctly bluish æneous, with yellow hairs. Pleura with long, white 

 hairs. Abdomen as broad as or fuUy as broad as thorax, not long. 



