394 Syrphidae. 



Female. Vertex and frons broad with about parallel borders, 

 black, but red above the antennæ; the black part greyish pruinose, 

 with yellow, at the ocelli black hairs. Thorax with the slaty grey 

 pruinosity more distinct than in the male and hence duller; the hairs 

 quite short, black except quite in front; scutellum likewise with short, 

 black hairs but the marginal bristles distinct. Abdomen quite yellow 

 with only the first incisure narrowly black. Femora quite yellowish red. 



Length 9 — 10 mm. 



R. rostrata is rare in Denmark, in earlier time it has been taken 

 iivsome numbers but later only a few specimens have been captured; 

 Ordrup Mose (Stæger), Søllerød (Godskesen); on Lolland; in Jutland 

 at Horsens, and on Bornholm. The dates are ^^/s — ^h. Zetterstedt 

 notes that this species does not occur in company with the folio wing; 

 I have seen specimens of both taken on the same date and the same 

 locality. 



Geographical distribution:— Europe down into Italy; towards 

 the north to southeren Sweden. 



2. R. campestris Meig. 



1822. Meig. Syst. Beschr. III, 259, 2, Tab. XXIX, Fig. 27. — 1843. Zett. 

 Dipt. Scand. II, 685, 2 et 1849. VIII, 3124, 2 et 1859. XIII, 5086, 2. — 

 1862. Schin. F. A. I, 326. — 1901. Verr. Brit. FL VIII, 479, 2, figs. 336—337. 

 — 1907. Kat. palåarkt. Dipt. III, 89. 



This species is very similar to the preceding but darker. Male. 

 Epistoma with the snout a little longer; third antennal joint a little 

 more elongate and pointed. Thorax æneous black, not bluish; it is 

 much less pruinose, more shining, and the darker, not pruinose stripes 

 wider so that the pruinosity only forms narrow, faint, greyish stripes, 

 one very narrow in the middle and two at each side. The hairs on 

 thorax longer than in rostrata, black except just in front. Scutellum 

 brown or blackish brown, the hairs black. Pleura with the hairs all 

 or mainly black. Abdomen brownish red, the base, the incisures, a 

 dorsal line and all the extreme margin black; sometimes the dorsal 

 line is abbreviated on second segment and not present on third. The 

 hairs on abdomen somewhat long, much longer than in rostrata, 

 mainly tawny. Venter reddish, base and also often apex blackish, 

 the hairs all pale. Legs reddish brown, femora with the basal half or 

 more black, tibiæ with blackish rings in the middle, more or less 

 faint on anterior tibiæ; anterior tarsi blackish towards the end, hind 

 tarsi blackish. The long hairs on front femora black, on posterior 

 femora pale on the basal half. Wings more or less yellowish. Squa- 



