Ghilosia. 149 



rup at Roskilde; on Lolland at Saxkøbing, in Kældskov, Dødemose 

 and at Strandby west of Nysted; on Langeland at Lohals; on Funen; 

 in Jutland in Vejle Nørreskov and Højenbæk Dal at Vejle and at 

 Horsens, and on Bornholm at Allinge, My dates are ^^U — ^"/s. It 

 occurs on flowers in fens and meadows, and also on open piaces in 

 woods, and it is often seen in great numbers in spring, especially in 

 May, on Tussilago and Anemone, but it may be found during the whole 

 summer. 



Geographical distribution : — All Europe, towards the north to 

 northern Sweden, and in Finland and Siberia; it is also recorded from 

 North America from Alaska. 



10. C. illustrata Harr. 



1776. Harr. Expos. engl. Ins. 104, Tab. XXXII, fig. 32 (Musca). — 

 1901. Verr. Brit. Fl. VIII, 234, 13, fig. 234. - 1907. Kat. palåarkt. Dipt. 

 III, 29. — Sijrphus oestraceus 1775. Fabr. (nec L.) Syst. Entom. 766, 18 

 et 1781. Spec' Ins. 11, 426, 23 et 1794. Entom. Syst. IV, 290, 44 et (Eristalis) 

 1805. Syst. Antl. 240, 34. — 1803. Schell. Genr. Mouch. Dipt. 54, Tab. XI, 

 Fig. 2a— d. — 1816. Fall. Dipt. Suec. Syrph. 21, 9. — 1822. Meig. Syst. 

 Beschr. III, 279, 2 et (Cheilosia) 1838. VII, 123. — Eristalis oestracea 1843. 

 Zett. Dipt. Scand. II, 778, 2. — C. oestracea 1857. Loew, Verh. zool. bot. 

 Gesell. Wien, VII, 584, 1. — 1862. Schin. F. A. I, 274. — 1894. Beck. 

 Nov. Aet. Leop. Carol. Akad. LXII, 380, 39. 



Male. Eyes hairy with long, yellowish or brownish hairs. Frons 

 densely yellowish pruinose, with a shallow longitudinal groove; vertex 

 and frons with long, yellow hairs. Epistoma 

 densely greyish yellow pruinose all over and 

 with rather long, pale hairs; it is somewhat 

 hollowed below the antennæ, the central 

 knob of medium size and moderately pro- 

 minent, epistoma slightly hollowed between 

 it and the very little protruding mouth edge, 

 and somewhat descending. Eye-margins very 

 broad, densely pruinose, with long, pale hairs, 

 below with some more or less numerous 

 black hairs intermingled, and from here down 

 to the mouth edge there are generally some 

 black hairs. Occiput grey pruinose, with 

 dense hairs which below and on the jowls ^n'^if' ^^^^^ °^ 



are long and whitish, in the middle short 



but becoming long upwards and yellow on the upper half ; just at the 

 lower eye-margin there is a brownish pruinose spot. Antennæ of 

 moderate size, reddish or blackish brown ; arista black, densely short- 



