154 Syrphidae. 



Female. Frons somewhat broad, widening downwards, trisulcate; 

 it has yellow, erect hairs, Epistoma more hoUowed than in the male. 

 Third antennal joint a little larger. Tiiorax and abdomen haired as 

 in the male, but the hairs a little shorter. Legs quite pale as also 

 the femora are yellow, only the last tarsal joint black and hind 

 metatarsi more or less blackish above; hind femora not setulose below 

 and the short hairs here all yellow, or at the apex a few black bristles. 

 Wings more yellow than in the male and often even a little brownish 

 on the apical part. Halteres orange. 



Length 8,5—11,5 mm. 



This species bears some resemblance to C. grossa but is easily 

 distinguished by the orange antennæ and in the female by the quite 

 pale legs. 



C. albipila is not common in Denmark; Ordrup Mose, Hillerød, 

 Tyvekrog, Grib Skov; on Lolland in Kældskov. It is exclusively a 

 spring species, my dates are 74 — ^Y^- It occurs on spring flowers 

 on meadows. 



Geographical distribution: — All Europe, towards the north to 

 northern Sweden, and in Finland. 



18. C. chloris Meig. 



1822. Meig. Syst. Beschr. III, 284,11 {Stjrphus chlorus) et 1830. VI. 

 352 et 1838. VII, 123. — 1843. Zett. Dipt. Scand. II, 788, 13 (Eristalis). — 

 1862. Schin. F. A. I, 286. — 1894. Beck. Nov. Aet. Leop. Carol. Akad. LXII, 

 420,73, Pig. 21—22 et 1902. Zeitschr. Hymn. Dipt. II, 351, II. — 1907. 

 Kat. palåarkt. Dipt. III, 25. — Syrphiis flavicornis Fabr. 1781. Spec. Ins. II, 

 431, 49 et 1794. Entom. Syst. IV, 302, 87. — 1822. Meig. I. c. III, 285, 14. — 

 Eristalis flavicornis Fabr. 1805. Syst. Antl. 244,56. — 1843. Zett. Dipt. 

 Scand. Il, 785. 10 et 1849. VIII, 3167, 10. — C. flavicornis 1902. Beck. 

 Zeitschr. Hymn. Dipt. II, 351, 14. — C. limbata Macq. 1827. Soc. Se. Lille, 

 204. - 1838. Meig. 1. c. VII, 128,47. 



Male. Eyes with somewhat long, dark brown hairs. Frons æneous, 

 with a longitudinal groove, black-haired ; vertex yellow-haired, or with 

 black hairs intermingled to nearly black-haired. Epistoma about as 

 in albipila, slightly pruinose below the antennæ, for the rest shining; 

 it is slightly hoUowed, the central knob small, lying long downwards, 

 between it and the somewhat prominent upper moutli edge the 

 epistoma hoUowed; it is moderately prominent below and somewhat 

 descending. Eye-margins of medium breadth, not prainose, with short, 

 yellow hairs. Occiput grey pruinose, the colour stopping below the 

 eye; the hairs yellow, above besides some long, black hairs. Antennæ 

 not large, the two last joints orange, the third about circular; arista 

 apparently bare, more or less distinctly yellowish at the base. Thorax 



II 



