144 Syrphidae. 



arista inore densely and a little longer-haired. Thorax more coarsely 

 punctate, though the punctuation is not coarse; the postalar and 

 scutellar marginal bristles less strong. Abdomen and its pubescence 

 about as in scutellata, but there are no black hairs at the hind corners 

 of third segment. Legs as in scutellata, but the black rings on all 

 tibiæ smaller and generally only the two last joints on the anterior 

 tarsi black and the hind tarsi orange in the middle; the legs are nearly 

 quite pale-haired as the long hairs on the posterior side of front 

 feniora are mainly pale; the fringe on the hind tibiæ is less extended, 

 pale with only some few dark hairs. 



Female, Likewise very similar to scutellata; frons a little broader, 

 with more distinct lateral channels towards the eyes. The central 

 facial knob less wide than in the male, and the sides of epistoma 

 below the eyes not or very slightly pale; third antennal joint much 

 larger and considerably larger than in the male, bright orange. Thor- 

 acai and scutellar marginal bristles distinctly weaker. Third and fourth 

 joint of posterior tarsi not broad. 



Length 7,5 — 9 mm. 



This species is very nearly allied to scutellata but distinguished 

 in both sexes by the orange antennæ with the third joint larger, 

 especially in the female, the longer and more densely-haired arista, the 

 smaller central facial knob and the slightly broader eye-margins besides 

 by other characters; in the female the sides of epistoma below are 

 not or scarcely pale, and a good character is the not broad third and 

 fourth joints of the posterior tarsi. 



C. soror is very rare in Denmark, only one specimen, a male, 

 has been caught in Jutland in Greisdal at Vejle on ^/s 1908 (the 

 author). 



Geographical distribution:— Northern and middle Europe and 

 recorded down into Spain and Italy; towards the north to middle 

 Sweden, in Finland, and in Siberia. 



8. C. longula Zett. 



1838. Zett. Ins. Lapp. 613, 15 et 1843. Dipt. Scand. II, 812, 36 

 (Eristalis). — 1894. Beck. Nov. Aet. Leop. Garol. Akad. LXII, 370, 33, 

 Fig. 162. — 1901. Verr. Brit. Fl. VIII, 217, 4, fig. 217. — 1907. Kat. 

 palaarkt. Dipt. III, 31. — C. plumulifera Loew, 1857. Verh. zool. bot. 

 Gesell. Wien, VII, 600, 17. — 1862. Schin. F. A. I, 280. — 1894. Beck. 

 1. c. 252. — ? Eristalis geniculata Zett. 1855. Dipt. Scand. XII, 4669, 37. 

 — 1894. Beck. 1. c. 249. — ? C. 7iigncornis Macq. 1827. Soc. Sci. Lille, 

 203, 10. — 1838. Meig. Syst. Beschr. 'VII, 126, 24. — 1902. Beck. Zeitschr. 

 Hymn. Dipt. II, 355, 24. — ? C. alhiseta Meig. 1838. 1. c. VII, 127, 36. — 

 1862. Schin. F. A. I, 288. — 1902. Beck. Zeitschr. Hymn. Dipt. II, 355, 36. 



