Eristalis. 431 



but indistinct) ; thorax Is clothed with longish, yellow hairs. Scutellum 

 brownish yellow with similar hairs as on thorax. Pleura with long, 

 pale yellow hairs. Abdomen black, dull, but with a transverse, shining 

 stripe on third and fourth segments, on third segment generally only 

 present on the black part and sometimes the stripes are divided in 

 the middle. Abdomen has large but somewhat varying reddish yeliow 

 side spots and the hind margins of the segments are yellow; when 

 the spots have their greatest extent they occupy all the side parts and 

 the hind margin of second segment, leaving a black spot in the 

 middle widening at the base, and further all the side parts and the 

 front margin of third segment reaching backwards beyond the middle 

 or to the hind margin, sloping outwards behind; when most restricted 

 they form an inwards triangular side spot on second and a small 

 basal corner spot on third segment; the spots are dull except at the 

 sides. Abdomen is clothed with yellow or reddish yellow hairs, paler 

 just at the base; sometimes there are some black hairs at the hin^ 

 margin in the middle on second segment. Venter varying between 

 yellowish and grey, generally with the anterior part yellowish with a 

 darker middle stripe, the posterior part grey; it is clothed with longish, 

 pale hairs. Legs black with apex of femora and about the basal half 

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

 whitish yellow and the middle metatarsi except the apex of the same 

 colour; hind tibiæ somewhat compressed and curved, and hind meta- 

 tarsi somewhat thickened. The legs haired in the usual way but, 

 however, rather characteristically; the hairs on femora are dense but 

 not specially long, especially on front femora; on the anterior tibiæ 

 the hairs form rather long and dense fringes on the posterior side, 

 the hind tibiæ are moderately fringed above and below; the hairs are 

 all whitish yellow, black only on the black apical half of hind tibiæ and 

 some few at apex on anterior tibiæ. Wings hyaline but yellowish at 

 the base and forwards on the anterior part to below the stigma and 

 here often specially distinctly. Stigma elongate, blackish at the base. 

 Squamulæ and fringes whitish yellow. Halteres yellow. 



Female. Vertex and frons broad, somewhat widening downwards ; 

 the vertical part blackish, somewhat pruinose, the frontal part yel- 

 lowish pruinose; the hairs yellow but there is a black-haired cross- 

 band in front of the ocelli. Thorax much more pruinose than in the 

 male as also the hinder half is pruinose with three elongated dark 

 spots. Abdomen with the markings smaller than in the male, only 

 present on the second segment as larger or smaller, inwards triangular 

 spots, sometimes rather small, or they may be dark hoary and then 

 slightly conspicuous; the hind margins of the segment are whitish 



