Eristalis. 427 



1843. Zett. Dipt. Scand. II, 665, 11 et 1852. XI, 4302, 11 (Syrphus). — 

 1862. Schin. F. A. I, 333 (Eristalis). — Helophilus tricolor Meig. 1803. 

 Ulig. Mag. II, 274. 



Velvet pilose species. Male. Vertex a little greyish pruinose ; frons 

 and epistoma brownish black, somewhat greyish pruinose, the epistoma 

 rather thinly; frons bare above the antennæ, epistoma with a middle 

 stripe and all the lower part bare and shining; jowls black. Vertex 

 with yellow hairs, just at the front angle a few black; frons with yel- 

 lowish, epistoma with whitish hairs. Epistoma very slightly hollowed 

 below the antennæ but retreating below the central knob and some- 

 what descending. Occiput pruinose, silvery along the eye-margin 

 below, greyish above and with a reddish spot above the middle; the 

 hairs blackish brown below, yellow above and here very few black 

 hairs. Eyes with brownish black hairs, down the anterior part a band 

 of dense hairs. Antennæ brownish, the basal joints darkest; arista 

 distinctly pubescent on the basal part. Thorax black, dull, very 

 densely clothed with black hairs; behind, in front of scutellum are 

 white hairs and on the postalar calli long, likewise white hairs. Scutel- 

 lum greyish white or bony white pruinose, dull, along the margin 

 more yellowish; just at the base it is black; it has white hairs. Pleura 

 wilh long, blackish brown hairs. Abdomen brownish black, dull, with 

 shining spots on second and third segments; first segment grey; ab- 

 domen is clothed with long, dense, black hairs, the apex from the 

 hind margin of third segment with yellow or reddish yellow hairs 

 which are longer; the first segment is white-haired and at the basal 

 corners of second segment are long, white hairs. Venter brownish, 

 with long hairs, mainly coloured as on dorsum. Legs blackish, tibiæ, 

 especially middle tibiæ, more or less, but generally slightly pale on 

 the basal part; posterior tarsi yellow with the last joint dark; hind 

 tibiæ compressed and a little curved, hind metatarsi not thickened. 

 Legs haired as usual, the hairs brownish black; on the femora they 

 are long and dense and hind tibiæ fringed. Wings hyaline. Stigma 

 small, about quadrate. Squamulæ whitish with a white fringe. Halteres 

 pale yellow, the knob may be a little darkened. 



Female. Vertex and frons broad, greyish pruinose, darker at the 

 vertex and black and shining above the antennæ; the hairs pale. 

 Wings with a large, brown blotch about the middle. 



Length 11 — 15 mm. 



This species shows some resemblance to E. intricarius, especially 

 to its dark varieties, but besides by the not plumose arista it is easily 

 distinguished by the bony white and white-haired scutellum and the 

 colour of the legs; from anthophorinus^ with which is has the not 



