174 



Syiphidae. 



the wings are much less tinged ; in the female the tlioracal pubescence 

 is different as it is longer, more erect and more conspicuously formed 

 of long and short tiairs in gigantea than in proxima. 



C. proxima is not at all common in Denmark; Ordrup Mose, 

 Lyngby Mose, at Fure Sø, Hillerød, Donse, Espergærde, Jægerspris; 

 on Lolland in Egholm Skov and Kældskov and at Kærstrup ; on Funen 

 at Odense and in Jutland at Horsens. My dates are */- — ^%, it thus 

 seems to be a somewhat late occurring species. 



Geographical distribution: — All Europe, towards the north to 

 middle Sweden; further in North Asia. 



23. C. impressa Loew. 



1840. Loew, Programm Posen, 33, 9 et Isis 1840. 570, 9. - 1862. 

 Schin. F. A. I, 282. — 1894. Beck. Nov. Aet. Leop. Carol. Akad. LXII, 

 436, 84, Fig. 89. — 1901. Verr. Brit. FL VIII, 243, 18, fig. 226. — 1907. 

 Kat. palåarkt. Dip't. III, 30. — Eristalis coemeteriorum Fall p. p. (nec L.) 

 1817. Dipt. Suec. Syrph. 51, 11. — 1843. Zett. Dipt. Scand. II, 804, 28 et 

 1859. XIII, 6019, 28. — Syrphus vernalis 1822. Meig. (nec Fall.), Syst. 

 Beschr. III, 290, 23. — C. vernalis 1902. Beck. Zeitschr. Hymn. Dipt. II, 

 352, 23. 



Male. Eyes with not long, brown hairs. Frons somewhat narrow% 

 with a narrow and not deep longitudinal groove: vertex and frons 

 black-haired. Epistoma slightly pruinose, shining, and only a little more 



pruinose below the antennæ: it is not 

 much hollowed below the antennæ, the 

 central knob somewhat large but relatively 

 not much prominent and between it and 

 the mouth edge the epistoma moderately 

 hollowed ; its lower part not prominent 

 and very slightly descending. Eye-margins 

 rather narrow, not pruinose, with short, 

 whitish hairs. Occiput slightly greyish 

 pruinose, below at the margin of the eye 

 it is more distinctly but narrowly grev, 

 the colour stopping below the eye; the 

 hairs are white below, mainly dark and 

 long above. Antennæ black, not large, 

 third joint nearly quadratic, not or very slightly longer than broad, 

 sometimes a little pale beneath the base; arista distinctly but short- 

 pubescent. Thorax æneous or bluish black, densely and somewhat 

 coarsely punctate, not much shining; it is clothed with somewhat 

 long, erect, and much shorter, more decumbent, black hairs; there are 



Fig. 87. Head of C. impressa c?. 



li 



