468 Syrphidae. 



lowish pruinose, the hairs whitish below, yellow above, and no black 

 hairs at the upper eye-margin. Antennæ black, third joint of a curious 

 shape, it is higher than long, straight above with a rectangular upper 

 corner; arista somewhat short, rather thickened in the basal two 

 thirds. Thorax duU black with two greyish, a little shining stripes 

 and a narrow median stripe, abbreviated behind ; the stripes are con- 

 fluent behind or disappearing in a shining space in front of scutellum ; 

 the sides are broadly yellowish. Thorax is clothed with short, yellow 

 hairs, on the postalar calli are numerous black hairs, and also some 

 inwards to the calli. Scutellum reddish brown with the base black, 

 and with short, yellow and black mixed hairs, longer and yellow at 

 the margin. Pleura greyish pruinose with yellow hairs. Abdomen 

 somewhat narrow, tapering behind and thus conical; it is black, dull, 

 the hind margins greyish, shining; the first segment grey, the second 

 has narrow, yellow side spots from the base to somewhat near the 

 hind margin, and in the middle two distantly placed, greyish yellow 

 pruinose longitudinal stripes, a little lunulate and a little oblique with 

 the posterior end nearest the side ; the third segment similarly marked 

 but also the side spots greyish yellow pruinose; the fourth segment 

 with a greyish yellow side margin and the middle stripes straight, 

 not lunulate, and broadest behind (the longitudinal middle stripes are 

 naturally to be considered as the separated inner ends of very deep 

 lunules). Abdomen is clothed with yellow hairs, black at the apex. 

 Genitalia yellowish pruinose, with yellow hairs. Venter blackish grey, 

 dull, with slightly paler incisures, and with long, pale hairs. Legs 

 black, the knees and a more or less distinct ring on the middle of 

 the tibiæ yellowish or reddish, on front tibiæ the ring generally only 

 seen behind; hind femora not much thickened; all tarsi rather flat 

 and broad, especially towards the end. The legs somewhat short- 

 haired, the hairs nearly all pale, on middle femora some very short, 

 black hairs below on the apical half of the anterior side and middle 

 tibiæ with some black hairs below; hind femora black-setulose below 

 in the apical half. Wings a little brownish tinged. Stigma consisting 

 only of the cross-vein. Squamulæ whitish with margin and fringes 

 yellow. Balteres yellow. 



Female. Vertex and frons broader than in the male, slightly 

 MMdening downwards; vertex black, frons yellow pruinose, above the 

 antennæ more greyish ; the hairs black on vertex, yellow on frons. 

 Thorax with the stripes broader, more distinct and more yellow, but 

 not shining, the space in front of scutellum more yellowish grey and 

 jess shining, the sides more broadly yellow. Abdominal spots as in 

 the male but larger; fifth segment pointed, greyish yellow with a 



