Syrphus. 329 



joint short oval; they are black, third joint more or less, often oniy 

 slightly, pale beneath at tiie base, the basal joints aiso often pale 

 beneath ; arista short, not as long as the the antennæ. Thorax greenish 

 æneous, dullish, with indications of tin-ee duller stripes, somewhat 

 punctate; it is clothed with longish, yellow hairs, longest behind. 

 Scutellum dark yellowish, somewhat æneous, with long, black hairs. 

 Pleura with long, pale yellow hairs. Abdomen not quite parallel- 

 sided, shghtly ovate; it is dull black, a little shining at base and more 

 so at apex; there are three pairs of yellow spots, the two posterior 

 pairs semicircular; the basal spots lie nearest the hind margin of the 

 segment, they are triangular, sloping forwards at the sides and with 

 the upper corner going near to the side margin but not reaching it; 

 they are widely separated in the middle; the spots of the second pair 

 are well away from the front margin, they are about semicircular with 

 a straight fore margin and a convex hind margin, and they go nar- 

 rowly over the side margin with their upper corners; in the middle 

 they are somewhat near to each other; the spots of the third pair 

 are similar, a little nearer the front margin; the fourth segment has 

 a broad, yellow hind margin and the fifth small basal corner spots. 

 The hairs on abdomen are somewhat long, especially towards the 

 sides; they foUow mainly the ground colour; at the sides they are 

 rather long, longest at the base and here yellow, for the rest altern- 

 ating black and yellow in accordance with the spots. Venter pale 

 yellowish, with long, pale hairs. Genitalia somewhat large, black and 

 shining, with black hairs. Legs black or paler or darker brownish, 

 anterior knees broadly but somewhat obscurely yellowish, and like- 

 wise the apex of tibiæ, hind knees more or less indistinctly pale; 

 sometimes the anterior tarsi a little pale at the base, and also the 

 hind tibiæ at the apex; the long hairs on the anterior femora yellow 

 on the basal part, black on the apical part, on the hind femora yel- 

 low; the short hairs on the legs are to a high degree black, especially 

 on the posterior legs. Wings yellowish or a little brownish tinged. 

 Squamulæ dirty yellowish, the fringes yellow. Balteres paler or darker 

 yellow, the peduncle generally darkened towards the base. 



Female. Vertex broad, bluish black, shining; there are yellowish 

 frontal side dust spots, meeting or almost meeting in the middle and 

 going down along the eye-margins; below the spots the frons is black, 

 shining; the hairs black. Eyes very short-haired but the hairs still 

 observable. Abdominal spots as in the male, but also the basal spots 

 going over the side margin, and the other spots less deep but, how- 

 ever, somewhat semicircular or at all events with the fore margin 

 straight, the hind margin convex. Legs about as in the male, or the 



