308 Syrphidae. 



somewhat long, yellow hairs, densest at the sides; scutellum dark 

 yellowish, somewhat bluish æneous, with black hairs, at the basal 

 corners and at the margin yellow hairs. Pleura with long, yellow 

 hairs. Abdomen marginate, dull black, a little shining at the hind 

 margins of the segments especially the third, and shining at the apex; 

 first segment bluish, shining; there are three pairs of large, yellow 

 spots; the first pair triangular, lying on the middle, sloping at the 

 sides and going near to the side margin at the upper corner but 

 generally not reaching it: the second pair are near to the front 

 margin, they are lunulate, a little oblique with the inner end nearest 

 the front margin; the outer lower corner is angular, the outer side 

 straight, nearer the side margin in front than behind; the third pair 

 similar but still nearer the front margin; the spots are isolated from 

 the side margin; the fourth segment has a yellow hind margin and 

 the fifth is yellow with a transverse, black middle spot. The hairs on 

 abdomen follow the ground colour, at the sides they are long and 

 yellow at the base, for the rest short and black. Venter yellow, with 

 black, transverse middle spots on the segments; it is clothed with 

 long, pale hairs, fourth segment partly with short, black hairs. Genitalia 

 small, reddish, only the eighth segment black just behind; the hairs 

 are black, pale only at the lower margin of the eighth segment. Legs 

 yellow with about the basal third of anterior femora and the basal 

 half or two thirds of hind femora black; the front tarsi and the last 

 four joints of the posterior tarsi blackish, hind metatarsi generally 

 brownish. The long hairs on femora are pale at the base, more or 

 less black outwards most so on front femora; the short hairs on the 

 anterior side of hind femora and on dorsal and anterior sides of hind 

 tibiæ black, for the rest yellow. Wings hyaline or very slightly tinged. 

 Squamulæ whitish yellow with yellow margin and fringes. Balteres 

 yellow. 



Female. Vertex of medium breadth, shining black, the black 

 space about quadrate; there are somewhat large, yellowish side dust 

 spots, between which the black colour is produced as a small furca 

 about half way down ; there are generally dark spots above the 

 antennæ; the hairs are black. Abdominal spots generally narrower 

 than in the male though varying in this respect, the basal spots go 

 often over the margin at the upper corners and second and third 

 pairs may in rare cases reach the margin just above. Anterior femora 

 with the base black, hind femora somewhat varying, sometimes quite 

 yellow, or with the base black or more rarely this colour is more ex- 

 tended stretching over the basal half or almost two thirds. 



Length 9—11,5 mm. 



