438 Syrphidae. 



13, E, vitripennis Strobl. 

 1893. Strobl, Mittheil. Ver. Steierm. XXIX, 1893, 187. — 1907. Kat. 

 palaarkt. Dipt. III, 107. 



Male. Vertex black, somewhat dull; frons black, shining, only 

 narrowly whitish pruinose at the sides ; epistoma whitish pruinose but 

 not densely, with a middle stripe, not reaching the antennæ, a broad 

 moutli edge and the lower lateral parts black, shining. Vertex and 

 frons black-haired, the latter with yellow hairs anteriorly, epistoma 

 with white hairs. The epistoma is slightly hollowed below the antennæ, 

 considerably retreating below the central knob and somewhat descending. 

 Occiput silvery pruinose along the eye-margin to above the middle, 

 for the rest black, slightly pruinose; the hairs are white below, almost 

 quite black above but behind the ocelli are some yellow hairs. Eyes 

 with brownish hairs. Antennæ black, third joint more or less brownish, 

 roundish; arista brown, plumose on the basal half. Thorax brownish 

 black, shining, not pruinose on the front half; it is clothed with yel- 

 low or reddish yellow hairs. Scutellum yellow or brownish, the larger 

 basal part black-haired, the rest yellow-haired. Pleura with longish, 

 yellow hairs. Abdomen black, second segment dull, third segment 

 shining with broad, dull front and hind margins, fourth shining with 

 front and hind margins indistinctly duUish; the second segment has 

 two inwardly triangular, yellow side spots, often not reaching the hind 

 margin at the sides, third segment without spots or with obscured 

 spots at the basal corners; the spots shining; the segments have pale 

 yellow hind margins, broadest on second segment. Abdomen is al- 

 most quite black-haired with only the base yellow-haired and the 

 genitalia pale-haired, but at the sides the hairs are yellow or only 

 black at the hind corners of second and third segments. Venter 

 blackish grey with pale incisures, second segment generally pale with 

 a dark middle spot; the venter is clothed with long, pale hairs. Legs 

 with femora black with yellow apex, hind femora with the base, up 

 to the basal third reddish yellow; front and hind tibiæ with about 

 the basal half, middle tibiæ with about the basal two thirds whitish 

 yellow ; front tarsi more or less pale at the base, sometimes indistinctly, 

 posterior tarsi with the two basal joints yellow with the apex black, 

 on the hind tarsi darkest yellow, sometimes brownish; hind tibiæ 

 slightly compressed, somewhat curved, hind metatarsi not thickened. 

 The legs haired as usual, the hairs not long; they are mainly yellow 

 but black behind the front femora on the apical part or to near the 

 base and more or less on the apical half of hind femora; the anterior 

 tibiæ have more or fewer black hairs on the apical part and the hind 

 tibiæ have the short fringe above and below black on the apical half, 



