Syrphus. 331 



dense than in punctulatus; they are most obvious above, Antennæ 

 short, black, third joint short oval: arista as long as the antennæ. 

 Tliorax æneous or bluish, somewiiat but not much shining, clothed 

 with rather long, yellovv hairs, longest behind; at the sides darker to 

 blackish hairs. Scutellum dark or brownish yellow, a little æneous, 

 with long, black. on the basal part yellow hairs. Pleura with long, 

 pale hairs, above with some black hairs. Abdomen a little ovate, 

 dull black, a little shining on first segment and at apex; it has three 

 pairs of yellow spots; the basal spots are somewhat small, roundish 

 or oval; the second pair are well away from the front margin, they 

 are transversely subquadrate, a little rounded inwards and well 

 separated; the third pair are quite similar; all the spots are isolated 

 from the side margin : tburth and fifth segments with narrow, yellow 

 hind margins. The hairs on abdomen are somewhat long, mainly 

 following the ground colour, but somewhat pale at the base; at the 

 sides they are long, yellow at the base, for the rest alternating black 

 and yellow in accordance with the spots. Venter blackish with pale 

 yellow spots almost quite as on the doi-sum ; it has long, pale hairs 

 intermingled with some black. Genitalia relatively large, black and 

 shining, with black hairs. Legs black, the anterior with apex of 

 femora and about the basal third or half of tibiæ obscurely yellow, 

 hind knees very indistinctly pale; hind tarsi longer than tibiæ, meta- 

 tarsi a little thickened. The hairs on femora long, on anterior femora 

 black, yellow at the base, on hind femora yellow; the short hairs 

 black on the apical part of hind femora and on hind tibiæ except 

 below, for the rest mainly yellow. Wings a little yellowish or greyish 

 tinged. Squamulæ whitish with yellow margin and fringes. Halteres 

 yellow. 



Female. Vertex broad, bluish black, shining; frons likewise black 

 and shining, with narrow, transverse side dust spots, nearly meeting 

 in the middle and going down along the eye-margins; the hairs black. 

 Epistoma pale-haired. Jowls orange, generally with a dark spot, or 

 line at the lower eye-margin. Eyes very slightly haired but the hairs, 

 however, quite visible. Antennæ larger than in the male. Scutellum 

 with only the marginal hairs black. The abdominal markings nar- 

 rower than in the male and thus more linear, and the basal spots 

 stretching more in on the disc; the spots are extended to the side 

 margin or just going over it; fifth segment with yellow spots at the 

 basal corners. Legs as in the male, anterior tibiæ sometimes a 

 little paler. 



Length fuUy 8 to 9,6 mm. 



This species is easily distinguished from punctulatus by the black 



