150 Syrphidae. 



pubescent. Thorax æneous on the front half, more black on the 

 posterior half, finely punctate, shining; it is clothed with long, erect 

 hairs which are yellow or whitish on the front part, black across the 

 middle and whitish at the hind margin and on scutellum, the latter 

 with black hairs in the middle; there are no bristles. Pleura grey 

 pruinose with long, whitish hairs on meso- sterno- and partly on 

 pteropleura. Abdomen black. shining, but the first and second seg- 

 ments grey pruinose; it is clothed with long, erect hairs which are pale 

 at the base, but reddish yellow towards the hind margin of second 

 segment, the third segment has mostly black hairs but in the middle 

 and on the hind part are reddish yellow hairs, and the whole apical 

 part of abdomen has reddish yellow hairs; sometimes abdomen is 

 much more reddish yellow-haired, black hairs only present at the sides 

 of third segment. Genitalia grey pruinose. Venter greyish pruinose 

 with long, pale hairs. Legs black, femora greyish pruinose with the 

 extreme apex yellow, tibiæ with the basal part yellow, the apex of 

 the middle tibiæ and the first or first two joints of the middle tarsi 

 more or less obscurely yellowish. The legs have rather long hairs, 

 not only the anterior femora behind but also the hind femora on the 

 anterior side, and likewise the other hairs on the femora and those 

 on the tibiæ are relatively longish and hence the tibiæ somewhat 

 fringed above; the hairs all pale, only towards the apex of middle 

 femora some black hairs; the hind femora are not properly setulose 

 beneath, but have some short, black bristles in the apical two thirds, 

 somewhat crowded at the apex; hind metatarsus not thickened. Wings 

 slightly tinged, with a more or less distinct, blackish band or blotch 

 on the middle; the upper angle at the upper marginal cross-vein 

 nearly rectangular. Squamulæ smoky whitish or brownish, with a 

 darker margin and a yellow fringe, Halteres yellow with the knob 

 more or less blackish. 



Female. Frons moderately broad, somewhat rapidly widening 

 downwards, with a lateral channel at each side; it is yellow-haired 

 and at a distance above the antennæ is a greyish pruinose band. 

 Third antennal joint considerably larger than in the male. Thorax 

 and abdomen haired as in the male, the hairs only slightly shorter; 

 scutellum without black hairs. 



Length 9,5 — 11 mm. 



Remarks: As well known this species was for a long time 

 considered as identical with Musca oestracea L., but as shown by 

 Haliday in 1851 (Stett. ent. Zeitg. XII, 189) by examining the type, 

 and also shown by the description, this is not so, the Musca oestracea 

 L. being identical with Eristalis apiformis Fall. Verrall has then in 



