Eristalis. 435 



various extent and generally the fourth segment is quite yellow-haired ; 

 at the sides the hairs are all yellow. Venter blackish grey with pale 

 incisures and long, yellow hairs; the basal segments sometimes pale 

 at the sides. Legs black, the apex of femora, about the basal half of 

 front and hind tibiæ, the basal two thirds of middle tibiæ and the 

 base of middle tarsi pale yellow; sometimes the base of hind femora 

 more or less pale (var. sylvarum Meig.) ; hind tibiæ slightly eompressed 

 and somewhat curved, hind metatarsi a little thickened. The legs 

 haired as usual, the hairs all yellow, only below the extreme apex of 

 hind femora some black hairs. Wings almost hyaline or somewhat 

 yellowish tinged on the anterior part. Stigma only a small dot. 

 Squamulæ yellow, darker dowards the base, fringes yellow. Halteres 

 yellow. 



Female. Vertex and frons broad, widening downwards ; the vertical 

 half black, the frons yellow pruinose, shining just above the antennæ; 

 the hairs yellow with a cross-band of black hairs about the ocelli, 

 sometimes broad, going almost to the middle. The eye-hairs almost 

 whitish. The abdominal markings small, generally not reaching more 

 than half way towards the hind margin, and all shining; they are 

 often obscured or quite wanting, but then shining spots are present; 

 the pale hind margins narrow. 



Length 10,5—12,5 mm. 



E. nemorum is not rare in Denmark, but, however, less common 

 than the preceding species; Hellerup, Ordrup Mose, Ermelund, Dyre- 

 haven, Fure Sø, Ørholm, Ruderhegn, Tyvekrog, Tisvilde; on Lolland 

 in Kældskov; on Funen at Middelfart, and on Fænø; in Jutland in 

 Nørholm Skov at Varde, at Horsens, Madum Sø and Frederikshavn, 

 and on Bornholm. My dates are ^/s — ^^/s. It occurs in the same way 

 as the other species. A pupa was taken at Madum Sø in Jutland on 

 ^^/t, it developed soon after (Kryger). 



Geographical distribution:— Europe down into Italy; towards 

 the north to middle Sweden, and on the Faroe Islands. 



12. E. horticola De Geer. 



1776. De Geer, Mém. Ins. VI, 140, 5, Tab. VIII, Fig. 13 (Musca). — 

 1822. Meig. Syst. Beschr. III, 396, 18. — 1862. Schin. F. A. I, 336. — 

 1901. Verr. Brit. Fl. VIII, 518, 10, figs. 358— 359. — 1907. Kat. palåarkt. 

 Dipt. III, 104. — E. flavicinctus Fabr. 1805. Syst. Antl. 232,5. — 1843. 

 Zett. Dipt. Scand. II, 655, 2 et 1 855. XII, 4650, 2 {Syrphus). — Syrphus 

 flavocinctus var. a, 1817. Fall. Dipt. Suec. Syrph. 24, 13. 



Male. Vertex black ; frons somewhat thinly yellowish pruinose most 

 at the sides, shining above the antennæ; epistoma yellowish pruinose 



2S* 



