146 Syrphidae. 



side; it is yellow-haired, only just in front of the ocelli some darker 

 hairs. Below the eyes the epistoma is indefinitely and obscurely 

 brownish, Antennæ with the third joint a little larger than in the 

 male, likewise longer than broad and generally paler; arista a little 

 more pubescent. Thorax with short, decumbent, greyish pubescence, 

 humeral callus yellowish; scutellum with the margin yellow, the bristles 

 somewhat strong. Abdomen with the middle of the second and hind 

 part of the third segment indefinitely dullish; its pubescence is short, 

 depressed and black on the dullish parts and the larger hind part of 

 fourth segment, on the other parts pale and more erect, longest at 

 the sides, especially at the base. Legs sometimes a little paler than 

 in the male, and squamulæ more yellow; hind femora not setulose 

 beneath. 



Length 7—8 mm. 



This species is known from the two preceding by the smaller 

 central facial knob and the darker legs, besides by other characters; 

 it is also smaller. I possess a curious female specimen which has the 

 hind metatarsi strongly swollen, of ovate shape; it is no doubt only 

 a monstrous specimen; it is taken in company with typical males. 



C. longula is rare in Denmark and has hitherto only been taken 

 on Langeland at Lohals (the author) and in Jutland at Holstebro 

 (H. J. Hansen), Rebbild near Skørping (Kryger), Jerup near Frederiks- 

 havn (Th. Mortensen) and at Skagen (Brinkmann). My dates are ^'^/t 

 to towards the end of August. It was for the first time taken in 1882. 



Geographical distribution: — Europe. recorded down into Italy; 

 towards the north to northern Sweden, in Finland, and in Siberia. 



9. C. pagana Meig. 



1822. Meig. Syst. Beschr. III, 292, 28 (Syrphus). — 1902. Beck. Zeitschr. 

 Hymn. Dipt. II, 354, 28. — 1907. Kat. palåarkt. Dipt. III, 35. — Eristalis 

 means Zelt. (nec Fabr.) 1843. Dipt. Scand. II, 787,12 et 1849. VIII, 3167, 

 12 et 1859. XIII, 6014. 12. — C. pulchripes Loew, 1857. Verh. zool. bot. 

 Geseli. Wien, VII, 597, 13. — 1862. Schin. F. A. I, 281. — 1894. Beck. 

 Nov. Aet. Leop. Garol. Akad. LXII, 372, 35, Fig. 161. — 1901. Verr. Brit. 

 Fl. VIII, 222, 7, figs. 222—223. 



Male. Eyes bare. Frons black, grey dusted at the sides, with a 

 distinct but small, longitudinal groove; vertex yellow-haired, only a 

 few darker hairs just at the front end, but sometimes much more 

 black-haired ; frons black-haired. Epistoma not much hoUowed below 

 the antennæ, the central knob not large, pointed and sloping evenly 

 above and at the sides, epistoma slightly hoUowed between it and 

 the mouth edge; it has the lower part somewhat protruding and is 



