The C-banded karyotypes of Metasyrphus corollae and Spherophoria scripta are presented. Their karyotypes show the same chromosome number 2n=8, the constitutive heterochromatin in both karyotypes has pericentromeric location, in M. corollae an additional C-band positive occuring on the third pair of autosomes. In the complement of the described species an exception is the whole euchromatin Y chromosome.
M.Rozek, Department of Experimental Zoology, Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Slawkowska 17, 31-016 Krakow, Poland