Chilosia. 



151 



1900 (Gatal. of the Syrph.) worked out a synonymi, also foUowed in 

 t.he Kat. palåarkt. Dipt., and from it he excllides Sijrphus oestraceus of 

 Fabricius placing this to Musca oestracea L., and in Brit. Fl. VIII he 

 says that M. oestracea L. was correctly interpreted by the foUowing 

 authors (except Schellenberg) until Fallen made the mistake. This seems, 

 however, not to be so, for in the coUection of Tonder Lund and Sehe- 

 stedt, the determination of which was mainly due to Fabricius, the pre- 

 sent species stands as Eristalis oestraceus, and consequently I have in- 

 cluded Fabricius in my synonymicai list. It is also to be noted that 

 Fabricius in his first work, Syst. Ent. 1775 excludes the specially disting- 

 uishing words of Linné "scutello albido" from his description; in the 

 later works he takes thern up, I think only following Linné's description. 



C. illustrata is a rather common species in Denmark, though some- 

 what local; Amager, Ordrup Mose, Jægerspris; on Lolland at Maribo, 

 in Kældskov and Dødemose; on Funen at Middelfart; in Jutland in 

 Vejle Nørreskov and Højenbæk Dal at Vejle, at Horsens, in Hø Skov 

 at Aarhus and at Rebbild near Skørping ; on Bornholm in Almindingen. 

 My dates are ^/e — ^/s. It occurs in fens and in woods and thickets 

 on open piaces and generally on flowers of Umbelliferæ. 



Geographical distribution: — Widely distributed species, occurring 

 all over Europe, tov^ards the north to middle Scandinavia, in Finland, 

 and further in north and middle Asia. 



11. C variabilis Panz. 



1798. Panz. Fn. Germ. LX, 10 {Sijrphus). — 1822. Meig. Syst. Beschr. 

 III, 281, 6 (Sijrphus) et 1838. VII, 123. — 1843. Zett. Dipt. Scand. II, 

 790, 14 et 1849. VIII, 3168, 14 et 1855. XII, 

 4664, 14 (Eristalis). — 1857. Loew, Verh. zool. 

 bot. Gesell. Wien, VII, 589, 7. — 1862. Schin. 

 F. A. I, 276. — 1894. Beck. Nov. Aet. Leop. 

 Garol. Akad. LXII, 381, 40, Fig. 117. — 1901. 

 Verr. Brit. Fl. VIII, 224, 8, fig. 210. — 1907. 

 Kat. palåarkt. Dipt. III, 40. — Eristalis nigrita 

 Fabr. 1805. Syst. Antl. 244, 55. — Eristalis 

 ater Fabr. 1805. 1. c. 246, 66. — Si/rphus ni- 

 grinus Meig. 1822. Syst. Beschr. III, 282, 7. — 

 C. nigrina 1902. Beck. Zeitschr. Hymn. Dipt. II, 

 350, 7. 



Fig. 74. Head of 

 C. variabilis d". 



Male. Eyes with longish, brownish hairs. 

 Frons black, greyish pruinose at the sides, 

 with a longitudinal groove; vertex and frons 

 black-haired. Epistoma pruinose below the antennæ, for the rest 

 slightly pruinose, with long, black hairs, pale below; it is somewhat 

 hollowed below the antennnæ, the central knob moderately prominent; 



