Eristalis. 423 



epistoma with long, yellow hairs ; the latter almost not hollowed below 

 the antennæ, straight down to the slightly protruding central knob, 

 below which it is somewhat retreating, and it is somewhat descending. 

 Occiput quite grey pruinose, the hairs whitish below, yellow above. 

 Eyes brown-hairy, with two longitudinal bands of denser and generally 

 darker hairs, united above and below. Antennæ black or brownish 

 black, third joint with the upper front corner rounded; arista brown, 

 slightly pubescent. Thorax black or brownish black, a little shining, 

 the front half part obscured from yellowish dust, in which traces of 

 two median stripes and a roundish spot on each side may be seen; 

 it is densely clothed with yellow hairs. Scutellum yellow with the 

 base darker and with yellow hairs. Pleura with long, yellow hairs. 

 Abdomen somewhat elongate, black, all shining, with more or less 

 extended yellow markings ; generally the markings consist of triangular 

 side spots on second segment and the second incisure yellow ; then 

 there may be a narrow stripe on each side of third segment, or these 

 stripes may be very broad and connected or united with the yellow 

 front margin, at the same time the basal spots are very broad, the 

 hind margin of third segment yellow and fourth segment with yellow 

 markings so that abdomen is nearly yellow with dark base and apex 

 and dorsal spots of various shape; in the darkest forms {hortorum 

 Meig.) abdomen is, on the contrary, almost quite black. Abdomen is 

 clothed with somewhat short, yellow to brownish hairs, darkest on 

 the hind part of second and on third segment. Venter with more or 

 less extended yellow markings on the sides, black at apex, with long, 

 yellow hairs. Legs black, the apex of femora and a larger or smaller 

 basal part of anterior tibiæ, until beyond the middle, and just the 

 base of hind tibiæ, pale yellow ; sometimes the basal part of hind tibiæ 

 brownish ; middle tarsi with the two first joints except the apex yellow ; 

 in the palest forms the hind femora have the basal part or half brown 

 or yellow {catnpestris Meig.) ; hind femora stout, hind tibiæ compressed 

 and slightly curved, hind metatarsus not dilated but all tarsi some- 

 what broad. Legs haired in the usual way, hind tibiæ fringed above 

 and below, the fringe below being suddenly long from above the 

 middle; the hairs behind anterior femora and on hind femora long 

 and dense, and also on the tibiæ relatively long; the hairs are yellow, 

 only the somewhat bristly hairs below the apex of hind femora black, 

 and also the fringe above and below hind tibiæ except above at the 

 base. Wings a little yellowish, especially on the anterior part, often 

 with an indistinct cloud below the stigma, sometimes more pronounced. 

 Stigma slightly longer than broad, brownish. Squamulæ and fringes 

 yellow. Balteres brown. 



