Platychirus. 211 



7. P. immarginatus Zett. 



1849. Zett. Dipt. Scand. VIII, 3149, 52—53 (Scaeva). — 1862. Schin. 

 F. A. 1, 296. — 1901. Verr. Brit. Fl. VIII, 287, 10, fig. 247. — 1907. Kat. 

 palåarkt. Dipt. III, 44. — Scaeva ferrnginea var. c. 1843. Zett. Dipt. Scand. 

 II, 749. — Scaeva podagrata Zett. p. p. 1843. 1. c. II, 751. — P. podagratus 

 1862. Schin. F. A. I, 296. 



Male. Frons and epistoma greenish black, brownish yellow pruinose, 

 somewhat thinly on the frons ; the central knob shining. Vertex yellow- 

 haired, at the front angle dark hairs; frons black-haired. Epistoma 

 with not long, yellow hairs, it is rather flat, the central knob slightly 

 prominent. Occiput yellowish pruinose, with yellow hairs, among which 

 no black. Antennæ rather short, shorter than in scamhus, third joint 



Fig. 105. Antenna of P. immarginatus d", from the inside, x 85. 



quadrate, not at all longer than broad; arista short and thick, shorter 

 than the antennæ. Thorax greenish æneous, shining, with somewhat 



I short, yellow hairs. Pleura with long, yellow hairs. Abdomen very 

 extensively yellow as only the base, a narrow middle line and very 

 narrow hind margins of second to fourth segments are black; fifth 

 segment quite yellowish with a black middle line. Abdomen is clothed 

 with short, yellow hairs, longer at the sides towards the base; on the 

 middle line are sonie black hairs. Venter yellowish, translucent, with 

 longish, pale hairs, short on fourth segment. Anterior legs yellow, 

 only front femora somewhat darkened behind and with two spots 

 below at base, and middle femora darkened below; hind legs as in 

 scamhus with femora and tibiæ blackish with base and apex yellow, 

 tarsi blackish with second and third joints yellow. Front trochanters 

 with small, yellow spines below; front femora behind at the base 

 with a white, tangled hair with the apex curved forwards, formed of 

 14* 



