Eristalis. 437 



about the basal half, middle tibiæ with the basal two thirds whitish 

 yellow; middle tarsi whitish yellow at the base, front tarsi generally 

 with the base more or less brownish but often indistinctly ; hind tibiæ 

 a little compressed and cm'ved, hind metatarsi not thickened. The 

 legs haired as usual, the hairs all yellow, only behind front femora 

 at apex generally some black hairs, and the moderate fringe on hind 

 tibiæ black in the apical half above and more or less black below; 

 beloAv the apical third of hind femora a row of very short, black 

 bristles. Wings hyaline, a little yellowish at the base, below the 

 stigma a more or less distinct, sometimes rather weak, brown fascia 

 down over the base of the cubital cell and the basal vein of the dis- 

 cai cell. Stigma a little longer than broad. Squamulæ with fringes 

 and the balteres yellow. 



Female. Vertex and frons broad, widening downwards; vertex 

 black and shining, dullish anteriorly, the frontal part yellowish pruinose, 

 shining above the antennæ; the hairs black on the black vertical space, 

 yellow on frons ; epistoma more descending than in the male. Antennæ 

 generally a little paler than in the male. Thorax a little more pruinose 

 on the front half so that the usual markings may be just traceable. 

 Abdominal spots about as in the male, those on third segment gener- 

 ally small and not rarely absent. Hind femora with the basal half 

 or more yellow; front tarsi generally paler at the base. Wings with 

 the fascia as a rule more distinct and broader, 



Length 11 — 14,5 mm. 



This species is somewhat like nemorum but distinguished by the 

 longer plumose arista, the more shining thorax, the abdominal spots 

 larger, especially in the female, and in the male generally spots present 

 on third segment, further by the spots being dull, the hind metatarsi 

 not thickened, the larger wing-stigma and the wing-band, and finally 

 the femora are generally more pale on the basal part. 



E. horticola is common in Denmark ; at Copenhagen, Ordrup Mose, 

 Ermelund, Dyrehaven, Lyngby Mose, Fure Sø, Trørød, Donse, Tyve- 

 krog, Frerslev Hegn, Tisvilde, Rørvig; on Lolland at Maribo, in Kæld- 

 skov and at Strandby west of Nysted; on Funen at Odense and 

 Middelfart; in Jutland in Nørholm Skov at Varde, Højenbæk Dal at 

 Vejle, at Hald near Viborg, Rebbild and Madum Sø near Skørping, 

 Thisted, Lønstrup and Hulsig near Frederikshavn, My dates are 

 ^/s— 1^9. It occurs on similar localities as the preceding species, I have 

 taken it on various flowers, often on Grataegus. 



Geographical distribution: — Europe down into Spain an Italy; 

 towards the north to northern Sweden. and in Finland. 



