178 Syrphidae. 



or almost quite obscure, but then, however, somewhat pale below; 

 hind femora setulose beneath but tlie bristles very short. Wings almost 

 quite yellow or yellowish brown. 



Len^4h 7 — 10 mm. 



The pupa is rather characteristic and easily knovvn from the otiier 

 mentioned Chilosia-pupæ. Is is dirty yellowish brown, 7,5 mm long; 

 there are two a little corrugated anterior spiracular tubes, about 1 mm 

 long; the posterior end is characteristically shaped, it is only slightly 

 attenuated and suddenly cut off, so that the posterior end forms a 

 flat, circular disc, turned very slightly obliquely upwards and with 

 some small, distant bunches of spines round the margin; in the middle 

 of the disc is the short, brownish black spiracular process, directed 

 straight backwards; its posterior end is flat, divided into two halves 

 by a perpendicular furrow, and with eight small, pointed protuberances 

 round the margin. 



This species is easily recognised by the characteristic colour of the 

 tarsi and the brown or brownish yellow^ wings; also the black hairs 

 at the front corners of the second abdominal segment in the male is 

 characteristic, but may sometimes be wanting; when in the female 

 the tarsi are obscured it may bear some resemblance to nigripes, but 

 this species has blackish wings and a much shorter-haired abdomen. 



C. albitarsis is our most common species of the genus and has 

 been taken in all parts of our country, including Bornholm. My dates 

 are 2^/4— ^"/t. It occurs on various flowers, especially Galtha and 

 Ranunculus, in fens, on fieids and in thickets, and especially in spring. 

 The pupa was taken by Mr. Kryger in flood refuse in Damhusmosen 

 on ^^/r,, the imago came on '*^/6, and in Ruderhegn on ^1-2 and ^^U, 

 the imagines developing respectively on ^''/^ — ^"'U and on 'Vs; further 

 it has been bred by Mr. SchJick from flood refuse at Randers, the 

 imagines came in May. 



Geographical distribution: — The species is distributed over all 

 Europe and into North Africa; towards the north to northern Sweden, 

 and in Finland. 



25. C. carbonaria Egg. 



1860. Egg. Verh. zool. bot. Geseli. Wien, X, 353. — 1862. Schin. 

 F. A. I, 281. — 1894. Beck. Nov. Aet. Leop. Carol. Akad. LXII, 454, 97. 

 Fig. 31—32. — 1901. Verr. Brit. Fl. VIII, 260, 20. — 1907. Kat. palåarkt. 

 Dipt. III, 24. 



Male. Eyes with not long, blackish brown hairs. Frons some- 

 what small and slightly arched, a little pruinose, more distinctly at 

 the margin ; it has a longitudinal groove. Vertex with black and yel- 



