Ferdinandea. 545 



F, A. I, 364. — Syrphus ruficornis Rossi (nec Fabr.) 1790. Faun. Etr. II, 

 290, 1466, Tab. X, Fig. 9. — 1817. Fall. Dipt. Suec. Syrph. 50, 2 (Eristalis). 

 — 1822. ,Meig-. Syst. Beschr. III, 278, 1 (Syrphus). — 1843. Zett. Dipt. 

 Scand. II, 779, 3 (Eristalis). 



Male. Vertex black, a little greyish pruinose; frons yellow to 

 brownish yellow, or more or less black except the anterior margin ; it 

 is greyish white pruinose along the eye-margins ; epistoma dark yellow, 

 somewhat pruinose at the eye-margins, the mouth edge and jowls 

 more brownish; vertex and frons black-haired, on the latter the 

 anterior margin bare; epistoma nearly bare, with only some black, 

 erect hairs below at the sides, but at the lateral mouth edges and on 

 the jowls are yellow hairs ; the eye-margins with yellow hairs. Occiput 

 grey pruinose from the brownish yellow jowls upwards; the hairs 

 whitish below, yellowish above and here a row of long, black 

 hairs overhanging the eyes. Eyes yellowish-haired. Antennæ reddish 

 or brownish red, third joint more or less blackish on the apical part; 

 arista black. Thorax dark æneous, shining, humeri and postalar calli 

 somewhat yellowish ; on the disc are four grey or bluish grey pruinose 

 stripes, the median stripes diverging behind and the median and lateral 

 stripes on each side connected in front and behind ; the lateral stripes 

 produced a little inwards' at the transverse furrow; on and at the 

 humeri are pruinose spots. Thorax is clothed with short, decumbent, 

 yellow and long, erect, black hairs. Scutellum yellowish translucent, 

 hkewise with short, yellow and long, black hairs; thorax has long, 

 black bristles along the sides, on the postalar calli and in front of the 

 scutellum, and this latter has numerous long, black marginal brisles. 

 Pleura grey or yellowish pruinose, with long, yellow hairs, above on 

 mesopleura are four long, black bristles. Abdomen bright æneous or 

 brassy and brightly shining; a narrow front margin on second seg- 

 ment and the hind margins of second and third segments dull black; 

 the black hind margins are produced more or less triangularly for- 

 wards in the middle and the second segment has a more or less 

 distinct, narrow, black dorsal line; abdomen is densely clothed with 

 somewhat short, erect, yellow or tawny hairs; they are longer at the 

 side margins and longest at the basal corners. Venter æneous, a little 

 pruinose, with somewhat long, yellow hairs. Legs yellow, coxæ and 

 trochanters black; the three last joints on the anterior tarsi and the 

 two last on hind tarsi blackish; for the rest the legs are either quite 

 yellow or the anterior femora are more or less black on the basal 

 part, until the basal half or more; sometimes also the hind femora 

 and the anterior tibiæ may have more or less distinct, dark rings, 

 sometimes rather large; the legs are haired in the usual way, the 



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